CN107592262A

CN107592262A - File transmitting method and the network architecture of the cross-domain forwarding of device, message

Info

Publication number: CN107592262A
Application number: CN201610532823.8A
Authority: CN
Inventors: 胡方伟
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-07-07
Filing date: 2016-07-07
Publication date: 2018-01-16
Also published as: WO2018006671A1

Abstract

The invention provides a kind of file transmitting method and the network architecture of the cross-domain forwarding of device, message.Wherein, the file transmitting method includes：The position index displaying duplication in the first domain converges point device BIER RP and notices cross-domain multicast group address to controller；The position index forwarding entry router BFIR in the first domain is after the cross-domain multicast data message transmitted to the second domain of request is received, the position index that multicast data message is transmitted to the first domain is forwarded egress router BFER by BFIR, by BFER by multicast data packet forwarding to the second domain.The present invention needs to take the technical problem of the more resource of network when solving multicast data transmission message in correlation technique.

Description

File transmitting method and the network architecture of the cross-domain forwarding of device, message

Technical field

The present invention relates to the communications field, in particular to a kind of file transmitting method and the cross-domain forwarding of device, message The network architecture.

Background technology

IP multicasting technologys realize efficient data transmission point-to-multipoint in IP network, can effectively save Netowrk tape It is wide, reduce network load, so, IP multicasting technologys real time data transmission, multimedia conferencing, data copy, IPTV, game and All many-sides such as emulation are all widely used.At present, multicasting technology typically uses Protocol Independent Multicast (Protocol Independent Multicast, abbreviation PIM agreements, including PIM-SM, PIM-DM), Multicast Source Discovery Protocol (Multicast Source Discovery Protocol, abbreviation MSDP agreement) etc. realize, one of these multicast protocols is the characteristics of common Need to build a kind of control plane multicast tree, using this multicast tree by network plane logical process to be tree-shaped, to realize multicast The point-to-multipoint data forwarding and loop of forwarding avoid, this to build distribution tree as in the multicast routing protocol of core Intermediate node needs to safeguard the state of complicated multicast forwarding information, increasing with network size, in multicast data traffic In the case of growing day by day, this multicasting technology faces the challenge in terms of increasing cost and O＆M.

Therefore, industry proposes a kind of new technology for being used to build multicast forwarding path, it is aobvious referred to as based on position index Formula reproduction technology (Bit Indexed Explicit Replication, abbreviation BIER technology), the technology propose a kind of new The multicasting technology framework that need not build multicast distribution tree, as shown in figure 1, support BIER technologies router be referred to as bit turn Router (Bit-Forwarding Router, referred to as BFR) is sent out, a multicast forwarding domain being made up of BFR is referred to as BFIR domains (namely BFIR domain), at the edge in BIER domains, the equipment of the multicast packet progress BFIR encapsulation to user is referred to as BFIR (full name is Bit-Forwarding ingress Router, BFIR1 and BFIR2 as shown in Figure 1), decapsulate BIER numbers Being referred to as BFER according to the edge BFR equipment of message, (full name is Bit-Forwarding egress Router, as shown in Figure 1 BFER1 and BFER2), multicast packet enters BIER domains by BFIR encapsulation, and the head dependent on BIER in BIER domains is turned Hair, and BIER domains are left via one or more BFER equipment, in BIER domains, receive and forward the equipment of BIER messages to claim For the transmission position index forwarding router (i.e. transit BFR) of the BIER messages.One BFR conciliates encapsulated message according to encapsulation Difference can be both BFIR role, can be BFER role again.

In BIER domains, the BFER to every edge of table distributes one and replicates subdomain (i.e. in whole position index displaying duplication BIER sub-domain) in globally unique bit (i.e. bit position), every BFER is by the bit of oneself Position is general in BIER domains using Interior Gateway Protocol (Interior Gateway Protocol, abbreviation IGP agreement) Flood, all bit position form a string of binary characters (i.e. bitstring), biography of the data message in BIER domains Pass and route and depend on bitstring.When other BFR have received the heading for including BIER, according to BIER headings The bitstring of middle carrying, and forwarded based on binary system forward table (i.e. Bit Forwarding Table).It is this to be based on The principle that BIER bit positions are forwarded is changed to carry out using bit identification by the forwarding based on structure multicast distribution tree is previously required to The mode forwarding multicasting of forwarding is searched in unicast, greatly reduces the forwarding cost of network.

Fig. 2 describes the process of BIER forwardings, and BFR1 is entrance position index forwarding router (i.e. ingress BFR), BFR5, BFR6 and BFR7 are respectively for egress BFR, BFR5, BFR6 and BFR7 these three BFR bit position 0001,0010,0100.Egress BFR are in advance by IGP agreements (such as Intermediate System to Intermediate System, or ospf protocol) in BIER The bit position, BFR1 that its own is noticed in domain have received the logical of BFR5, BFR6 and BFR7 bit position After announcement, these information are preserved in the position index forward table of local.After BFR1 have received multicast message, it is assumed that the multicast message Need to be transferred to BFR5 and BFR6, then BFR1 is calculated the Bitstring's of the message according to the mapping relations preserved in advance It is worth for 0101, the multicast message of user is encapsulated as BIER messages, the Bitstring fillings 0101 in BIER Header simultaneously turns BFR2 is dealt into, after BFR2 receives message, searches the entry in the position index forward table preserved in advance, according to entry, message needs BFR3 is forwarded to, then Bitstring is done and operated with the F-BM of the item entries of the matching, obtains 0101, BFR2 with 0101 BIER messages are refilled as the Bitstring in BIER Header, and forward the packet to BFR3, BFR3 have received this After message, the position index forward table of oneself is searched, BFR3 there are 2 bar matching records, represents message next-hop respectively and be forwarded to BFR4 and BFR6, for first entry, Bitstring value is done and operated with the F-BM in entry by BFR3, obtains result For 0001, in second entry, it is 0100 that Bitstring value is done with the result operated with F-BM, then BFR3 distinguishes message Forwarding BIER messages from 2 interfaces, BFR4 BIER Header Bitstring value is 0001, and is turned to BFR4 and BFR6 The value for being dealt into BFR6 BIER Header Bitstring is 0100.Message for reaching BFR6, finds bitstring's Being worth the bit position with oneself notice, the destination that oneself is the message is represented, decapsulates BIER messages.And reach When message reaches BFR4, foregoing forwarding principle, forwards the packet to BFR5 successively, and BIER messages are decapsulated by BFR5, so far, Transmission of the multicast message in BIER domains is completed, multicast message is forwarded to the receiving node of multicast by the BFR1 nodes of entrance BFR4 and BFR6.

Notice for user multicast group address, industry are proposed using IGMP/multicast listener discovery Agreement (i.e. IGMP/MLD agreements) is added to the methods of BIER layers, requestors of the BFIR as IGMP/MLD, and BFER is as detecing Hearer, the message of user multicast group are transmitted by IGMP/MLD messages overlay (being superimposed) to BIER networks, and BFIR is received After having arrived the IGMP/MLD messages that BFER is sended over, it is possible to study to user multicast group corresponding to BFER.

BIER forwardings above, the method for multicast group address notice are applied when single domain, can be very good to meet to want Ask, but for cross-domain transmitting multicast data, some problems can be run into：Existing bitstring notice is using IGP Agreement is noticed, and this distributed bitstring notices can not accomplish unified management and planning, and cross-domain forwarding needs After the BIER messages decapsulation in the first domain, BIER encapsulation is re-started on the border in the second domain, forward efficiency is than relatively low；Use IGMP/MLD messages are added to what the cross-domain multicast group address of position index displaying duplication layer (i.e. overlay bier) progress was noticed Mode, when network size is bigger, multicast user join and depart from multicast group behavior it is more frequent when, IGMP/MLD can be caused Message spreads unchecked, a large amount of to take BIER forwarding resources.

Technical problem for needing the more resource of occupancy network in correlation technique during multicast data transmission message, at present Not yet propose effective solution.

The content of the invention

The embodiments of the invention provide a kind of file transmitting method and the network architecture of the cross-domain forwarding of device, message, so that Solve to need to take the technical problem of the more resource of network during multicast data transmission message in correlation technique less.

One side according to embodiments of the present invention, there is provided a kind of file transmitting method, this method include：First domain Position index displaying duplication-convergence point device BIER-RP notices cross-domain multicast group address to controller；The position index forwarding in the first domain Ingress router BFIR is after the cross-domain multicast data message transmitted to the second domain of request is received, and BFIR is by multicast data message The position index transmitted to the first domain forwards egress router BFER, by BFER by multicast data packet forwarding to the second domain.

Further, the position index displaying duplication-convergence point device BIER-RP in the first domain notices cross-domain multicast to controller Group address includes：BIER-RP notices cross-domain multicast group address by the BGP-LS agreements after extension to controller.

Further, being increased newly in the Node Descriptor TLVs of BGP-LS agreements has sub- TLV, and newly-increased sub- TLV is used In the cross-domain multicast group address of carrying.

Further, the position index that multicast data message is transmitted to the first domain is forwarded egress router BFER bags by BFIR Include：BFIR determines the BFER connected in the first domain with the second domain；BFIR transmits multicast data message to connecting with the second domain BFER。

Further, multicast data packet forwarding to the second domain is included by BFER：Whether BFER judges the second domain with One domain is adjacent；In the case where judging that the second domain is adjacent with the first domain, BFER transmits multicast data message to the second domain BFIR；In the case where judging that the second domain is not adjacent with the first domain, BFER by multicast data message by the 3rd domain transmit to The BFIR in the second domain, wherein, the 3rd domain connects with the first domain and the second domain respectively.

Other side according to embodiments of the present invention, additionally provides a kind of file transmitting method, and this method includes：First The position index forwarding egress router BFER in domain notices BFER cross-domain ability by the Routing Protocol after extension in the first domain Attribute information；Position index forwarding entry router BFIR in first domain is receiving multicast packet of the request transmission to the second domain During message, the BFER connected with the second domain is determined, wherein, BFIR determines that BFER is by BFER cross-domain capabilities attribute information It is no to be connected with the second domain；BFIR transmits multicast data message to the BFER connected with the second domain, passes through what is connected with the second domain BFER sends multicast data message to the second domain.

Further, the position index in the first domain forwards egress router BFER by the Routing Protocol after extension in the first domain Interior notice BFER cross-domain capabilities attribute information includes：The BFER in the first domain is by the Routing Protocol after extension into the first domain BFIR notices BFER cross-domain capabilities attribute information.

Further, it is new in the OSPF BIER Sub-TLV of ospf protocol in the case where Routing Protocol is ospf protocol Increasing has sub- Sub-TLV, newly-increased sub- Sub-TLV to be used for the cross-domain capabilities attribute information for carrying BFER.

Further, in the case where Routing Protocol is ISIS agreements, the ISIS BIER info Sub of ISIS agreements- Being increased newly in TLV has sub- Sub-TLV, and newly-increased sub- Sub-TLV is used for the cross-domain capabilities attribute information for carrying BFER.

Further, in the case where Routing Protocol is bgp protocol, increased newly in the BGP BIER info TLV of bgp protocol There are sub- TLV, newly-increased sub- TLV to be used for the cross-domain capabilities attribute information for carrying BFER.

Further, cross-domain capabilities attribute information is including being used to represent the first attribute field of cross-domain capabilities attribute, being used for Indicate whether to support forwarding equal cost multipath ECMP the second attribute field and for representing what is with the BFIR in the second domain be connected 3rd field of the system information of autonomous system.

Other side according to embodiments of the present invention, there is provided a kind of packet transmission device, the device include：First is logical Unit is accused, for controlling the position index displaying duplication-convergence point device BIER-RP in the first domain to notice cross-domain multicast group to controller Address；Transmission unit, the position index forwarding entry router BFIR for the first domain cross-domain are transmitted to second receiving request After the multicast data message in domain, the position index that multicast data message is transmitted to the first domain is forwarded egress router by control BFIR BFER, by BFER by multicast data packet forwarding to the second domain.

Further, the first notification unit includes：First announcement module, after controlling BIER-RP by extension BGP-LS agreements notice cross-domain multicast group address to controller.

Further, transmission unit includes：Determining module, for determining what is connected in the first domain with the second domain by BFIR BFER；First transport module, for being transmitted multicast data message to the BFER connected with the second domain by BFIR.

Further, transmission unit includes：Judge module, for by BFER judge the second domain whether with the first domain phase It is adjacent；Second transport module, in the case where judging that the second domain is adjacent with the first domain, by BFER by multicast data message Transmit to the BFIR in the second domain；3rd transport module, in the case where judging that the second domain is not adjacent with the first domain, controlling BFER transmits multicast data message to the BFIR in the second domain by the 3rd domain, wherein, the 3rd domain respectively with the first domain and second Domain connects.

Other side according to embodiments of the present invention, a kind of packet transmission device is additionally provided, the device includes：Second Notification unit, the position index for controlling the first domain forward egress router BFER by the Routing Protocol after extension in the first domain Interior notice BFER cross-domain capabilities attribute information；Determining unit, for controlling the position index forwarding entry router in the first domain BFIR receive request send to the second domain multicast data message when, determine the BFER connected with the second domain, wherein, BFIR determines whether BFER connects with the second domain by BFER cross-domain capabilities attribute information；Transmitting element, for controlling BFIR Multicast data message is transmitted to the BFER connected with the second domain, sent out multicast data message by the BFER connected with the second domain Deliver to the second domain.

Further, the second notification unit includes：Second announcement module, for control the first domain BFER by extension after BFIR from Routing Protocol to the first domain notice BFER cross-domain capabilities attribute information.

Other side according to embodiments of the present invention, there is provided a kind of network architecture of the cross-domain forwarding of message, the network Framework includes stratification controller, position index displaying duplication-convergence point device BIER-RP, the position index forwarding positioned at the first domain Ingress router BFIR and position index forwarding egress router BFER, wherein, stratification controller is used to manage cross-domain route Information, network topological information and multicast group information；BIER-RP is connected with stratification controller and BFIR respectively, for layer Secondaryization controller notices cross-domain multicast group address, sends cross-domain routing iinformation to the second domain, notices what is received in the first domain Cross-domain routing iinformation；BFIR is connected with stratification controller, for receive request transmit to the multicast datagram in the second domain Wen Shi, according to cross-domain multicast group address corresponding with multicast data message and autonomous system information multicast data forwarding message to right The BFER answered；BFER be used for will the multicast data packet forwarding that receive to the second domain.

Further, stratification controller includes SDN controllers and supernet controller, and supernet controller is used for The system information of cross-domain multicast group address and the second domain based on multicast data message is generated for indicating multicast data message The control information of transmission route, and multicast data message and control information are issued to BFIR by SDN controllers.

Further, BIER-RP by the BGP-LS agreements after extension to SDN controllers notice cross-domain multicast group address and The system information in the second domain.

Further, being increased newly in the Node Descriptor TLVs of BGP-LS agreements has sub- TLV, and newly-increased sub- TLV is used In the system information for carrying cross-domain multicast group address and the second domain.

Further, BFER is additionally operable to notice BFER cross-domain energy to the BFIR in the second domain by the Routing Protocol after extension Power attribute information.

In embodiments of the present invention, the position index displaying duplication-convergence point device BIER-RP in the first domain notices to controller Cross-domain multicast group address；The position index forwarding entry router BFIR in the first domain cross-domain is transmitted to the second domain receiving request After multicast data message, the position index that multicast data message is transmitted to the first domain is forwarded egress router BFER by BFIR, by Multicast data packet forwarding to the second domain is needed to take by BFER so as to solve during multicast data transmission message in correlation technique The technical problem of the more resource of network, realize the technique effect for the Internet resources for reducing multicast data transmission message.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the schematic diagram of message forwarding plane in correlation technique；

Fig. 2 is the schematic diagram that message forwarding is carried out in correlation technique；

Fig. 3 is the schematic diagram of the network architecture of the cross-domain forwarding of message according to embodiments of the present invention；

Fig. 4 is the schematic diagram of the network architecture of the cross-domain forwarding of optional message according to embodiments of the present invention；

Fig. 5 is the schematic diagram of the network architecture of the cross-domain forwarding of optional message according to embodiments of the present invention；

Fig. 6 is the schematic diagram of the network architecture of the cross-domain forwarding of optional message according to embodiments of the present invention；

Fig. 7 is the schematic diagram of the network architecture of the cross-domain forwarding of optional message according to embodiments of the present invention；

Fig. 8 is the schematic diagram of the network architecture of the cross-domain forwarding of optional message according to embodiments of the present invention；

Fig. 9 is the schematic diagram of optional TLV according to embodiments of the present invention form；

Figure 10 is the schematic diagram of optional TLV according to embodiments of the present invention form；

Figure 11 is the schematic diagram of optional TLV according to embodiments of the present invention form；

Figure 12 is the schematic diagram of optional TLV according to embodiments of the present invention form；

Figure 13 is the schematic diagram of optional TLV according to embodiments of the present invention form；

Figure 14 is the schematic diagram of optional TLV according to embodiments of the present invention form；

Figure 15 is the schematic diagram according to embodiments of the present invention noticed by bgp protocol；

Figure 16 is the schematic diagram of cross-domain transmitting multicast data according to embodiments of the present invention；

Figure 17 is a kind of flow chart of file transmitting method according to embodiments of the present invention；

Figure 18 is a kind of schematic diagram of packet transmission device according to embodiments of the present invention；

Figure 19 is the flow chart of another file transmitting method according to embodiments of the present invention；

Figure 20 is the schematic diagram of another packet transmission device according to embodiments of the present invention.

Embodiment

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting In the case of, the feature in embodiment and embodiment in the application can be mutually combined.

It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, " Two " etc. be for distinguishing similar object, without for describing specific order or precedence.

Embodiment 1

According to embodiments of the present invention, for cross-domain forwarding a kind of the problem of, there is provided network architecture of the cross-domain forwarding of message Embodiment, as shown in figure 3, the network architecture includes：Stratification controller Controller, position positioned at the first domain AS100 Index displaying duplication-convergence point device BIER-RP, position index forwarding entry router BFIR and position index forwarding outlet route Device BFER.

Stratification controller is used to manage cross-domain routing iinformation, network topological information and multicast group information.

BIER-RP is connected with stratification controller and BFIR respectively, for noticing cross-domain multicast group to stratification controller Address, cross-domain routing iinformation is sent to the second domain AS200, the cross-domain routing iinformation received is noticed in the first domain.

BFIR is connected with stratification controller, for receive request transmit to the multicast data message in the second domain when, According to cross-domain multicast group address corresponding with multicast data message and autonomous system information multicast data forwarding message to corresponding BFER。

BFER be used for will the multicast data packet forwarding that receive to the second domain.

By above-described embodiment, the cross-domain routing iinformation of stratification controller management, network topological information and multicast group letter Breath；BIER-RP notices cross-domain multicast group address to stratification controller, cross-domain routing iinformation is sent to the second domain, in the first domain It is middle to notice the cross-domain routing iinformation received；BFIR receive request transmit to the multicast data message in the second domain when, according to Cross-domain multicast group address corresponding with multicast data message and autonomous system information multicast data forwarding message are to corresponding BFER； BFER is by the multicast data packet forwarding received to the second domain, during so as to solve multicast data transmission message in correlation technique The technical problem of the more resource of occupancy network is needed, realizes the technology effect for the Internet resources for reducing multicast data transmission message Fruit.

It should be noted that above-mentioned stratification controller includes SDN controllers and supernet controller, supernet The system information that controller is used for cross-domain multicast group address and the second domain based on multicast data message is generated for indicating multicast The control information of the transmission route of data message, and multicast data message and control information are issued to BFIR by SDN controllers.

In the above-described embodiments, what is be connected with the first domain AS100 can be a domain, or it is multiple, such as Fig. 4 institutes Show, the network architecture includes position index forwarding entry router device BFIR, position index displaying duplication-convergence point device BIER- RP, position index forwarding outlet router device BFER, network controller device Controller and super controller equipment Super Controller, BIER message encapsulation, position index forwarding outlet route are carried out after the receiving multicast data of position index forwarding entry road Device equipment is located at autonomous domain border (i.e. AS borders, AS full name is Autonomous System), by multicast data packet forwarding To other autonomous system domains；BIER-RP equipment needs to notice cross-domain multicast group address information to network controller, controller and super Level controller carries out stratification control to BIER networks.Multicast group address information is noticed to controller for BIER-RP, at present also There is no correlation technique to realize, the application can be by extending the BGP-LS protocol realizations functions.The application is carried with reference to Fig. 4 The structure of the cross-domain networks of BIER gone out is described in detail：

The network architecture may include 4 AS autonomous system domains, respectively AS100, AS200, AS300 and AS400, in order to retouch The convenience stated, in the schematic diagram of the application, it is believed that AS domain simultaneously and BIER domain (in the application of reality, one Individual AS domains may include multiple BIER domains, i.e. BIER domain), i.e. there are 4 BIER domain, respectively BIER in Fig. 4 Domain 1, BIER domain 2, BIER domain 3 and BIER domain 4.BIER domain 1 include Six equipment of BFIR11, BFR11, BFR12, BFER11, BFER12 and BIER-RP11；BIER domain 2 include Five equipment of BFIR21, BFR21, BFR22, BFER21 and BIER-RP21；BIER domain 3 include BFIR31, BFR31, Six equipment of BFR32, BFER31, BFER32 and BIER-RP31；BIER domain 4 include BFIR41, BFR41, BFR42, Six equipment of BFER41, BFER42 and BIER-RP41.Controller1, Controller1, Controller3 are network SDN Controller, Super Controller are super controller.Each composition portion in the network architecture of the application is described in detail one by one below The function of dividing.

(1) position index displaying duplication-convergence point device BIER-RP

Set as shown in figure 4, BIER-RP (including BIER-RP11, BIER-RP21 etc.) is position index displaying duplication-convergent point Standby, for the newly added equipment of the network structure that cross-domain BIER forwardings are realized based on SDN controllers of the application, position index shows multiple System-convergence point device is responsible for the notice of the cross-domain multicast address in this domain, with other domains position index displaying duplication-convergence point device it Between establish logic connection, transmit cross-domain routing iinformation, and the cross-domain routing iinformation that other domains are sent is noticed in this domain.

In Figure 5, position index displaying duplication-convergence point device (is ascended the throne and indexed out with position index ingress router BFIR11 Mouth router BFER11) it is connected with network controller Controller1, in addition, position index displaying duplication-convergence point device also may be used With with other BIER domains (namely autonomous system domains, in this application, for convenience, it is believed that BIER domains and autonomous system domains Position index displaying duplication-convergence point device equally) is connected, and as BIER-RP11 is connected with BIER-RP22, these connections can be with Connection for the direct-connected of physics or in logic.

Interface between definable network SDN controllers Controll1 and BIER-RP11 is I1 interfaces, in order to BIER- RP nodes notice the parameters such as the network topological information in this BIER domains, multicast group information to network SDN controllers, and I1 interfaces can lead to Extension Netconf agreements or BGP-LS protocol realizations are crossed, other southbound interface protocol realizations can also be used.

Interface between definable BIER-RP11 and BFIR11 is I2 interfaces, and I2 interfaces are completed cross-domain routing iinformation and existed Notice between BIER-RP and BFIR.I2 interfaces can be realized by extending IGP agreements (ISIS agreements or ospf protocol).

Interface between definable BIER-RP11 and BFER11 is I3 interfaces, and I3 interfaces realize that cross-domain routing iinformation exists Notice between BIER-RP11 and BFER11, also realize that BFER11 cross-domain boundary node capabilities attribute is advertised to BIER-RP11 Node.I3 interfaces can be realized by extending IGP agreements (ISIS agreements or ospf protocol).

Interface between definable BIER-RP11 and BIER-RP22 is I4 interfaces, and I4 interfaces realize cross-domain route and parameter The notice of information between the two domains, I4 interfaces can be realized by extending bgp protocol, can also use other inter-domain protocols Realize.

(2) position index forwarding entry router BFIR

As shown in figure 4, BFIR (including BFIR11, BFIR21 etc.) is position index ingress router equipment, in this application, BFIR11 is used for the encapsulation for carrying out BIER messages, is additionally operable to enhancing and realizes that receiving the cross-domain multicast group address that controller issues believes Breath.With reference to Fig. 6 illustrate the application propose enhancing position index ingress router realize cross-domain forwarding network interface and The realization of function：

Be the interface schema of position index ingress router shown in Fig. 6, BFIR11 is position index ingress router, BFIR11 with (i.e. position index forwarding router, an Autonomous Domain may include multiple position index forwarding routers to BFR11 in BIER domains, such as BFR11 and BFR12) it is connected, with BIER-RP11 logic associatives, meanwhile, BFIR11 is with network SDN controllers Controller11 Between it is logically contiguous, BFIR11 is defined as I6 interfaces with the interface of other BIER forwarding units in BIER domains, with BIER-RP it Between interface be I2 interfaces, BFIR11 is I5 interfaces with the interface between Controller1, I2 interfaces connection BFIR11 and BIER-RP equipment, the connection can be connected for the direct-connected of physics or in logic, and I2 interfaces are what the application proposed The cross-domain network structures of BIER need the interface function newly realized on BIER, and the interface is completed cross-domain between BFIR and BIER-RP The notice of the information such as network linking state, cross-domain route and parameter.BFIR11 and Controller1 is connected in I5 interface logics to set Standby, I5 interfaces realize that network SDN controllers Controller1 issues the information such as the forwarding route of correlation, cross-domain parameter and arrived BFIR11 equipment, I5 interfaces pass through southbound interface protocol realization, such as Netconf, PCEP.The protocol realization specifically used, this Specific restriction is not done in invention.I6 interfaces are the interface that existing BIER equipment will be realized, I6 interfaces complete IGP agreements The functions such as the neighbor state of (ISIS agreements or ospf protocol) finds and safeguarded, link state parameter floods, information announcement.

(3) position index forwarding egress router BFER

As shown in figure 4, BFER (BFER11, BFER12, BFER21 etc.) is position index egress router equipment, in the application In, BER11 and BFER12 equipment is not only needed to decapsulate the BIER messages in this domain, and multicast message can be also forwarded to other AS In domain or it is forwarded to the recipient of multicast message, it is also necessary to notice the domain border capabilities attribute information of itself, enter for position index The egress router of the suitable cross-domain transmitting multicast data of mouth router device selection.The increasing of the application is illustrated with reference to Fig. 7 The network structure of strong position index forwarding egress router and interface function definition are realized.

Fig. 7 show the interface function figure of position index forwarding egress router, and BFER11 is position index forwarding outlet route Device, BFR11, BFR12 are middle position index forwarding router, and BIER-RP11 is position index displaying duplication-convergence point device, The position index forwarding egress router of the enhancing of the application be connected with BFER12 with BIER-RP11 (can be the connected of physics, Can be logically contiguous), the interface defined between BFER11 and BER12 is I7 interfaces, between definition BFER11 and BIER-RP11 Interface be I3 interfaces, I7 interfaces existing IGP agreements notice Link State and maintenance, link bandwidth function on the basis of, Also realize that BFER11 notices BFER cross-domain boundary node capabilities attribute to BFER12.I3 functional interface is defined on above-mentioned implementation Detailed description has been carried out in example, is not repeated to describe herein.

(4) position index forwarding router BFR

BFR (including BFR11, BFR12, BFR21 etc.) is position index transmission route device, is transmitted according to position index forward table BIER messages.

(5) stratification SDN controllers Controller

The network structure and interface of the network architecture middle-levelization SDN controllers of the application are illustrated with reference to Fig. 4 and Fig. 8 Definition.

Controller (including Controller1, Controller2 etc.) is network SDN controllers, configuration and management Forwarding unit in BIER domains, network SDN controllers Controller receive BIER domains forwarding unit by southbound interface agreement On the topology information sent and multicast group address information etc., controller passes through control information according to the calculating and decision-making of oneself The agreements such as Netconf or PCEP issue control information to related BIER equipment.Controller Controller is by super controller Management, when needing to notice cross-domain information, it is necessary to be calculated by super controller and decision-making.

Super controller receives the information of controller Controller1, Controller2, Controller3 notice, and Related control information is issued to controller Controller1, Controller2, Controller3.

For the SDN controllers for the cross-domain network that the application proposes by the way of stratification, each BIER domains have oneself SDN controller, SDN controller control autonomous system domains (BIER domains, model of the acquiescence autonomous system domains with BIER domains Enclose the same) under BIER equipment, including position index ingress router, position index displaying duplication-convergence device, with position index entrance The interface of router is I5, and the interface with BIER-RP is I1, and for I5 interfaces, SDN controller issues the forwarding letter of correlation Index entry router, the interface use southbound interface protocol realization to breath in place, can be the southbound interface such as Netconf, PCEP Agreement.For I1 interfaces, the interface between SDN controller and position index displaying duplication-convergence device, user's SDN nets Network controller collects cross-domain information, network topological information, multicast group information etc. using the interface.

Cross-domain information is noticed and issued to SDN controller, this connects with being connected between super controller using I8 interfaces Mouth can use northbound interface agreement, Restfull interface protocols, Netconf agreements etc..

By above-described embodiment, by being extended to existing BIER systems, so as to save message repeating process In resource consumption.

Alternatively, BIER-RP notices cross-domain multicast group address and the by the BGP-LS agreements after extension to SDN controllers The system information in two domains.

Specifically, being increased newly in the Node Descriptor TLVs of BGP-LS agreements has sub- TLV, newly-increased sub- TLV to be used for Carry the system information in cross-domain multicast group address and the second domain.

Fig. 9 show the format chart of Node Descriptor TLV in existing BGP-LS agreements, and the type field value is 256 or 257, the node for being expressed as this section describes TLV and the node of distal end describes TLV.Length fields are this Sub-TLV Overall length angle value.Node Descriptor Sub-TLVs (variable represents elongated) field is Node Descriptor The content for the Sub-TLV that TLV is carried.The Sub-TLV types currently having been defined for have as shown in table 1.

The Sub-TLV that current Node Descriptor TLV extensions carry has 4, Type values (i.e. Sub-TLV Code Point it is respectively) 512~515, represents autonomous system number (Autonomous i.e. corresponding with Description respectively System), BGP-LS identifies (i.e. BGP-LS Identifier), OSPF region ID (i.e. OSPF Area-ID), IGP road By device ID (i.e. IGP Router-ID), for length (i.e. Length) in addition to IGP router id is variable-length, others are long Degree is all 4.

Table 1

Sub‐TLV Code Point	Description	Length
			512	Autonomous System	4
513	BGP‐LS Identifier	4
			514	OSPF Area‐ID	4
515	IGP Router‐ID	Variable

The information such as the cross-domain multicast group address of the application proposition and autonomous system number needs to extend new Sub-TLV (i.e. BIER inter-domain Multicast sub-TLV) carry, BIER inter-domain Multicast sub- TLV represents the multicast address information and autonomous system information that BIER-RP is supported.Node Descriptor TLV after extension can It is as shown in table 2 with the Sub-TLV of support：

Table 2

Sub‐TLV Code Point	Description	Length
			512	Autonomous System	4
513	BGP‐LS Identifier	4
			514	OSPF Area‐ID	4
515	IGP Router‐ID	Variable
			516	BIER inter‐domain Multicast	Variable

BIER inter-domain Multicast sub-TLV forms are as shown in Figure 10, and its field is described as follows：

The suggestion of the type field value is 516.

Length fields are BIER inter-domain Multicast Sub-TLV total length.

AS Number are to notice the autonomous system number where the BIER-RP of the BGP-LS information.

Res is reserved field.

Multicast address type fields indicate the type of multicast address, when the field value is 1, represent BIER The multicast address that inter-domain Multicast Sub-TLV are carried is IPv4 addresses, when value is 2, represents BIER The multicast address that inter-domain Multicast Sub-TLV are carried is IPv6 addresses.

Number of multicast address represent that BIER inter-domain Multicast Sub-TLV take The number of the multicast address of band.

multicast address：The multicast address that BIER inter-domain Multicast Sub-TLV are carried.

BIER inter-domain Multicast Sub-TLV are noticed from the BIER-RP in BIER domains to controller, institute Carried with this Sub-TLV by Local Node Descriptors TLV.BIER inter-domain Multicast Sub- TLV can be filled repeatedly.

In the above-described embodiments, BFER is additionally operable to notice BFER's to the BFIR in the second domain by the Routing Protocol after extension Cross-domain capabilities attribute information.

Alternatively, in the case where Routing Protocol is ISIS agreements, the ISIS BIER info Sub-TLV of ISIS agreements In increase newly and have a sub- Sub-TLV, newly-increased sub- Sub-TLV is used for the cross-domain capabilities attribute information for carrying BFER.

Figure 11 show ISIS BIER info Sub-TLV format chart, and the ISIS BIER info Sub-TLV are carried There is BIER underlying parameter, including the information such as sub-domain id, BFR-id, the Sub-TLV can also carry MPLS The Sub-Sub-TLV such as Encapsulation Sub-Sub-TLV and BIER sub-domain Tree Type, are respectively used to take The parameter information and BIER of MPLS encapsulation with BIER are used for the information for calculating the tree in path, and the application extends ISIS BIER Info Sub-TLV, newly-increased Sub-TLV are AS Border BFER Sub-Sub-TLV, carry position index egress router Cross-domain capabilities attribute information.

As position index egress router encapsulation Link State data message unit (Link State Packet Data Unit, referred to as LSPDU) when, ISIS BIER info-Sub-TLV information is encapsulated, BIER info Sub-TLV carry AS Border BFER Sub-Sub-TLV, position index egress router are existed after packaged LSPDU using ISIS flooding mechanisms BIER is flooded in domain, after the position index ingress router in BIER domains and BIER-RP routers have received the LSPDU, Can judges that the position index egress router is according to the AS Border BFER Sub-Sub-TLV of the carrying contents indicated It is no to support cross-domain forwarding, and learn the information such as No. AS of other connected autonomous system domains.

Alternatively, in the case where Routing Protocol is ospf protocol, increased newly in the OSPF BIER Sub-TLV of ospf protocol There are sub- Sub-TLV, newly-increased sub- Sub-TLV to be used for the cross-domain capabilities attribute information for carrying BFER.

Figure 12 show OSPF BIER Sub-TLV format chart, and the OSPF BIER sub-TLV also carry BIER's Underlying parameter, the information such as including Sub-domain-ID, BFR-id, the sub-TLV can also carry MPLS Encapsulation Sub-Sub-TLV, the parameter information that the MPLS for noticing BIER is encapsulated.The application extends OSPF BIER Sub-TLV, increases newly Sub- Sub-TLV be AS Border BFER Sub-Sub-TLV, carry position index egress router cross-domain ability forwarding letter Cease (i.e. cross-domain capabilities attribute information).

When position index egress router encapsulates LSA (Link State Advertise, LSA), encapsulation OSPF BIER Sub-TLV information, BIER Sub-TLV carry AS Border BFER Sub-Sub-TLV, position index outlet Router is flooded after packaged LSA, using OSPF flooding mechanisms in BIER domains, when the position index entrance in BIER domains After router and BIER-RP routers have received the LSA, it is possible to according to the AS Border BFER Sub-Sub-TLV of carrying The content of instruction judges whether the position index egress router supports cross-domain forwarding, and learns other connected autonomous system domains The information such as No. AS.

Alternatively, being increased newly in the case where Routing Protocol is bgp protocol, in the BGP BIER info TLV of bgp protocol has Sub- TLV, newly-increased sub- TLV are used for the cross-domain capabilities attribute information for carrying BFER.

Figure 13 show BGP BIER TLV format charts, and BGP BIER TLV carry BIER underlying parameter, including Sub- The information such as domain ID, BFR-id, the TLV can carry MPLS encapsulation sub-TLV, for noticing BIER's The parameter information of MPLS encapsulation.It is AS Border BFER Sub- that the application, which extends BGP BIER TLV, newly-increased sub- TLV, TLV, carry the cross-domain ability forwarding information of position index egress router.

It should be noted that cross-domain capabilities attribute information include be used for represent cross-domain capabilities attribute the first attribute field, For indicating whether to support forwarding equal cost multipath ECMP the second attribute field and for representing the BFIR phases with the second domain 3rd field of the system information of autonomous system even.

The AS Border BFER Sub-Sub-TLV format charts of the application are as shown in figure 14, and the description of each field is such as Under：

The type field：AS Border BFER Sub-Sub-TLV are expressed as, the value of the field needs IANA points of IETF Match somebody with somebody；

Length fields：This Sub-Sub-TLV total length；

I field：Whether indicating bit index egress router supports cross-domain forwarding, when field value is 1, represents that support is cross-domain Forwarding, when being 0, cross-domain forwarding is not supported, now the value of adjacency AS number fields is ignored；

E fields：Whether indicating bit index egress router supports ECMP to forward, and when field value is 1, represents to support ECMP, when being 0, do not support ECMP；

Adjacency AS number fields：The autonomous system number of the connected autonomous system of position index egress router.

As established bgp peer connection in Figure 15 between BFER11 and BFR12, BIER-RP11, intercommunication BGP routes, work as position When indexing egress router BFER11 encapsulation BGP update message packets, BGP BIER TLV information, BIER TLV letters are encapsulated Carried in breath and position index egress router is carried in AS Border the BFER Sub-TLV, the Sub-TLV of the application proposition Update message is sent to peer-to-peer BFR12 and BIER-RP11, BFR12 by BFER11 cross-domain capabilities attribute information, BFER11 After update message being have received with BIER-RP11, it is possible to which the AS Border BFER Sub-TLV according to being carried in message refer to Show that content judges whether BFER11 supports cross-domain forwarding, and learn the information such as No. AS of other connected autonomous systems.Meanwhile by Bgp peer connection, intercommunication BGP routes are also established between BIER-RP11 and position index ingress router BFIR11, then BFIR11 can also recognize whether BFER11 supports cross-domain forwarding by BIER-RP11, realize the position index outlet on border The cross-domain capabilities attribute of router in BIER domains by bgp protocol distribution and flood, send to BFR11, BFIR11 etc..

Figure 16 is the procedure chart of the transmitting multicast data of the cross-domain frameworks of BIER of the application.Figure 16 is still with 4 BIER Exemplified by domain, BIER domain1 BFIR1 is the entrance of multicast traffic stream, and multicast packet needs to be forwarded to BIER Domain 3 and BIER domain4 recipient, when multicast traffic stream be forwarded to BIER domain3 position index Exit Road by During device BFER32, it is necessary to by BIER domain1, BIER domain 2 and BIER domain3 domain (i.e. AS100, AS200, Tri- autonomous systems of AS300), when multicast traffic stream is forwarded to BIER domain4 position index egress router BFER42, Need as follows by two domains of BIER domain1 and BIER domain4, detailed data forwarding flow：

BFIR11 in step S101, BIER domain1 domains receives multicast traffic stream, finds connecing for the multicast packet Receipts person has cross-domain recipient, it is necessary to carry out cross-domain multicast forwarding, the cross-domain multicast framves of BIER that BFIR11 is built according to the present invention Structure carries out BIER encapsulation, wherein BIER bitstring fields cover up to this domain position index egress router BFER11 and BFER12。

Packaged message is sent in BIER domain1 by step S102, BIER BFIR11, and the message passes through middle Transmission node BFR11, BFR12 etc. are sent to position index egress router BFER11, BFER12.

Step S103, position index egress router BFER11 and BFER12 decapsulation BIER message encapsulation, after decapsulation Multicast message be separately sent to BIER domain2 position index ingress router BFIR21 and BIER domain4 position rope Intake router BFIR41.

Step S104, position index ingress router BFIR21 and BFIR41 do the forwarding behavior similar to BFIR11, by group Report text and be forwarded to BFER21 and BFER42 respectively.

Step S105, position index egress router BFER21 are similar to BFER11 forwarding behavior, and BIER messages are unsealed BFIR31 is forwarded to after dress, position index egress router BFER42 is forwarded to multicast user and received after BIER messages are decapsulated Person.

Step S106, after position index ingress router BFIR31 receives multicast message, carry out BIER encapsulation and turn message The multicast message recipient in this domain is dealt into, completes transmission of the multicast data message between multiple autonomous system domains.

It should be noted that in figure 16, Label (such as Label11, Label12) represents label, BIER Header (such as BIER Header11, BIER Header13) represents the head of BIER messages, Payload load, the mark in Figure 16 It is identical with Fig. 4, it will not be repeated here.

By above-described embodiment, by that to the transformation of each node in the network architecture and the expansion of agreement, can solve correlation The problem of carrying out needing to consume compared with multiple resource during message forwarding in technology.

Embodiment 2

According to embodiments of the present invention, there is provided a kind of embodiment of the method for file transmitting method is, it is necessary to illustrate, attached The step of flow of figure illustrates can perform in the computer system of such as one group computer executable instructions, though also, So logical order is shown in flow charts, but in some cases, can be with different from shown by order execution herein Or the step of description.

Figure 17 is a kind of flow chart of file transmitting method according to embodiments of the present invention, as shown in figure 17, this method bag Include following steps：

Step S1701, the position index displaying duplication-convergence point device BIER-RP in the first domain notice cross-domain group to controller Broadcast group address.

Request is cross-domain to be transmitted to second receiving by step S1702, the position index forwarding entry router BFIR in the first domain After the multicast data message in domain, the position index that multicast data message is transmitted to the first domain is forwarded egress router BFER by BFIR, By BFER by multicast data packet forwarding to the second domain.

By above-described embodiment, the position index displaying duplication-convergence point device BIER-RP in the first domain to controller notice across Domain multicast group address；The position index forwarding entry router BFIR in the first domain cross-domain is transmitted to the group in the second domain receiving request After multicast data message, the position index that multicast data message is transmitted to the first domain is forwarded egress router BFER by BFIR, by BFER By multicast data packet forwarding to the second domain, need to take network during multicast data transmission message in correlation technique so as to solve The technical problem of more resource, realize the technique effect for the Internet resources for reducing multicast data transmission message.

In the above-described embodiments, the position index displaying duplication-convergence point device BIER-RP in the first domain to controller notice across Domain multicast group address includes：BIER-RP notices cross-domain multicast group address by the BGP-LS agreements after extension to controller.

Alternatively, being increased newly in the Node Descriptor TLVs of BGP-LS agreements has sub- TLV, newly-increased sub- TLV to be used for Carry cross-domain multicast group address.

In an optional embodiment, the position index that multicast data message is transmitted to the first domain is forwarded Exit Road by BFIR Included by device BFER：BFIR determines the BFER connected in the first domain with the second domain；BFIR transmits multicast data message to The BFER of two domains connection.

In another optional embodiment, multicast data packet forwarding to the second domain is included by BFER：BFER judges Whether the second domain is adjacent with the first domain；In the case where judging that the second domain is adjacent with the first domain, BFER is by multicast data message Transmit to the BFIR in the second domain；In the case where judging that the second domain is not adjacent with the first domain, BFER leads to multicast data message The 3rd domain is crossed to transmit to the BFIR in the second domain, wherein, the 3rd domain connects with the first domain and the second domain respectively.

Figure 16 is the procedure chart of the transmitting multicast data of the cross-domain frameworks of BIER of the application.This Shen is described in detail with reference to Figure 16 Embodiment please：

Through the above description of the embodiments, those skilled in the art can be understood that according to above-mentioned implementation The method of example can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but a lot In the case of the former be more preferably embodiment.Based on such understanding, technical scheme is substantially in other words to existing The part that technology contributes can be embodied in the form of software product, and the computer software product is stored in a storage In medium (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, calculate Machine, server, or network equipment etc.) perform method described in each embodiment of the present invention.

Embodiment 3

A kind of packet transmission device is additionally provided in the embodiment of the present invention.The device be used for realize above-described embodiment and preferably Embodiment, repeating no more for explanation was carried out.As used below, term " module " can realize predetermined function The combination of software and/or hardware.Although device described by following examples is preferably realized with software, hardware, or The realization of the combination of person's software and hardware is also what may and be contemplated.

Figure 18 is a kind of schematic diagram of packet transmission device according to embodiments of the present invention.As shown in figure 18, the device can With including：First notification unit 181 and transmission unit 182.

Position index displaying duplication-convergence point device BIER-RP that first notification unit 181 is used to control the first domain is to control Device notices cross-domain multicast group address.

Transmission unit 182, the position index forwarding entry router BFIR for the first domain are receiving the cross-domain transmission of request To the multicast data message in the second domain, the position index that multicast data message is transmitted to the first domain is forwarded Exit Road by control BFIR By device BFER, by BFER by multicast data packet forwarding to the second domain.

By above-described embodiment, the first notification unit controls the position index displaying duplication-convergence point device BIER- in the first domain RP notices cross-domain multicast group address to controller；The position index forwarding entry router BFIR in the first domain receive request it is cross-domain Transmit to the multicast data message in the second domain, transmission unit control BFIR transmits multicast data message to the position rope in the first domain Draw forwarding egress router BFER, passed multicast data packet forwarding so as to solve in correlation technique to the second domain by BFER The technical problem of the more resource of occupancy network is needed during defeated multicast data message, realizing reduces multicast data transmission message The technique effect of Internet resources.

In the above-described embodiments, the first notification unit includes：First announcement module, for controlling BIER-RP to pass through extension BGP-LS agreements afterwards notice cross-domain multicast group address to controller.

Above-mentioned transmission unit includes：Determining module, for determining what is connected in the first domain with the second domain by BFIR BFER；First transport module, for being transmitted multicast data message to the BFER connected with the second domain by BFIR.

Above-mentioned transmission unit also includes：Judge module, for judging whether the second domain is adjacent with the first domain by BFER； Second transport module, in the case where judging that the second domain is adjacent with the first domain, being passed multicast data message by BFER Transport to the BFIR in the second domain；3rd transport module, in the case where judging that the second domain is not adjacent with the first domain, controlling BFER transmits multicast data message to the BFIR in the second domain by the 3rd domain, wherein, the 3rd domain respectively with the first domain and second Domain connects.

It should be noted that above-mentioned modules can be realized by software or hardware, for the latter, Ke Yitong Cross in the following manner realization, but not limited to this：Above-mentioned module is respectively positioned in same processor；Or above-mentioned modules are with any The form of combination is located in different processors respectively.

Embodiment 4

Figure 19 is the flow chart of another file transmitting method according to embodiments of the present invention, as shown in figure 19, this method Comprise the following steps：

Step S1901, the position index in the first domain forward egress router BFER by the Routing Protocol after extension first BFER cross-domain capabilities attribute information is noticed in domain.

Step S1902, position index forwarding entry router BFIR in the first domain are sent to the second domain receiving request Multicast data message when, determine the BFER connected with the second domain, wherein, the cross-domain capabilities attribute information that BFIR passes through BFER Determine whether BFER connects with the second domain.

Domain autonomous system information (such as system number letter connected with BFER is carried in above-mentioned cross-domain capabilities attribute information Breath), the autonomous system number in purposeful domain is also carried in multicast data message, so can be by judging the autonomous system number of the two Whether identical judge whether BFER connects with the second domain；The second above-mentioned domain is the purpose domain of multicast data message, or group Multicast data message domain of achieving the goal needs the domain passed through.

Step S1903, BFIR transmit multicast data message to the BFER connected with the second domain, by being connected with the second domain BFER multicast data message is sent to the second domain.

By above-described embodiment, the position index forwarding egress router BFER in the first domain is existed by the Routing Protocol after extension BFER cross-domain capabilities attribute information is noticed in first domain；Position index forwarding entry router BFIR in first domain is being received When request is sent to the multicast data message in the second domain, the BFER connected with the second domain is determined, wherein, BFIR passes through BFER's Cross-domain capabilities attribute information determines whether BFER connects with the second domain；Multicast data message is transmitted to the second domain and connected by BFIR BFER, by sending multicast data message to the second domain with the BFER that the second domain connects, so as to solve in correlation technique The technical problem of the more resource of occupancy network is needed during multicast data transmission message, realizing reduces multicast data transmission message Internet resources technique effect.

In the above-described embodiments, the position index forwarding egress router BFER in the first domain is existed by the Routing Protocol after extension BFER cross-domain capabilities attribute information is noticed in first domain to be included：The BFER in the first domain is by the Routing Protocol after extension to first The cross-domain capabilities attribute information of BFIR notices BFER in domain.

Length fields：This Sub-Sub-TLV total length；

Figure 16 is the procedure chart of the transmitting multicast data of the cross-domain frameworks of BIER of the application.Figure 16 is still with 4 BIER Exemplified by domain, BIER domain1 BFIR1 is the entrance of multicast traffic stream, and multicast packet needs to be forwarded to BIER Domain 3 and BIER domain4 recipient, when multicast traffic stream be forwarded to BIER domain3 position index Exit Road by During device BFER32, it is necessary to by BIER domain1, BIER domain 2 and BIER domain3 domain (i.e. AS100, AS200, Tri- autonomous systems of AS300), when multicast traffic stream is forwarded to BIER domain4 position index egress router BFER42, Need detailed in last embodiment by two domains of BIER domain1 and BIER domain4, detailed data forwarding flow State, will not be repeated here.

Embodiment 5

Figure 20 is the schematic diagram of another packet transmission device according to embodiments of the present invention.As shown in figure 20, the device It can include：Second notification unit 201, determining unit 202 and transmitting element 203.

Second notification unit 201, after the position index for controlling the first domain forwards egress router BFER by extension Routing Protocol notices BFER cross-domain capabilities attribute information in the first domain.

Determining unit 202, for controlling the position index forwarding entry router BFIR in the first domain receiving request hair When delivering to the multicast data message in the second domain, the BFER connected with the second domain is determined, wherein, the cross-domain energy that BFIR passes through BFER Power attribute information determines whether BFER connects with the second domain.

Transmitting element 203, for controlling BFIR to transmit multicast data message to the BFER connected with the second domain, by with The BFER of second domain connection sends multicast data message to the second domain.

By above-described embodiment, the second notification unit controls the position index forwarding egress router BFER in the first domain to pass through expansion Routing Protocol after exhibition notices BFER cross-domain capabilities attribute information in the first domain；Determining unit controls the position rope in the first domain Draw forwarding entry router BFIR receive request send to the second domain multicast data message when, determine and the second domain connect Logical BFER, wherein, BFIR determines whether BFER connects with the second domain by BFER cross-domain capabilities attribute information；Transmitting element Control BFIR transmits multicast data message to the BFER connected with the second domain, by with the BFER that the second domain connects by multicast number Sent according to message to the second domain, need to take network more money during multicast data transmission message in correlation technique so as to solve The technical problem in source, realize the technique effect for the Internet resources for reducing multicast data transmission message.

The second notification unit in above-described embodiment includes：Second announcement module, for controlling the BFER in the first domain to pass through The cross-domain capabilities attribute information of BFIR notice BFER of the Routing Protocol into the first domain after extension.

Length fields：This Sub-Sub-TLV total length；

Embodiment 6

Embodiments of the invention additionally provide a kind of storage medium.Alternatively, in the present embodiment, above-mentioned storage medium can The program code for performing following steps to be arranged to storage to be used for：

S1, the position index displaying duplication-convergence point device BIER-RP in the first domain is controlled to notice cross-domain multicast group to controller Address；

Request is cross-domain to be transmitted to the multicast in the second domain receiving by S2, the position index forwarding entry router BFIR in the first domain After data message, the position index that multicast data message is transmitted to the first domain is forwarded egress router BFER by BFIR, will by BFER Multicast data packet forwarding is to the second domain.

Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：

S3, the position index forwarding egress router BFER in the first domain are noticed by the Routing Protocol after extension in the first domain BFER cross-domain capabilities attribute information；

S4, position index forwarding entry router BFIR in the first domain are sent to the multicast number in the second domain receiving request During according to message, the BFER connected with the second domain is determined, wherein, BFIR determines BFER by BFER cross-domain capabilities attribute information Whether connected with the second domain；

S5, BFIR transmit multicast data message to the BFER connected with the second domain, pass through the BFER connected with the second domain Multicast data message is sent to the second domain.

Alternatively, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. is various can be with the medium of store program codes.

Alternatively, in the present embodiment, processor performs according to the program code stored in storage medium：Control first Position index displaying duplication-convergence point device the BIER-RP in domain notices cross-domain multicast group address to controller；Control the position in the first domain Index forwarding entry router BFIR when receiving multicast data message, judge multicast data message receive object where Whether the second domain is same domain with the first domain；In the case where judging that the second domain is not same domain with the first domain, BFIR is controlled The position index that multicast data message is transmitted to the first domain is forwarded into egress router BFER, by BFER by multicast data packet forwarding To the second domain.

Alternatively, in the present embodiment, processor performs according to the program code stored in storage medium：Needing to pass During defeated cross-domain multicast data message, the position index forwarding egress router BFER in the first domain of control passes through the route after extension and assisted Discuss to the second domain notice BFER cross-domain capabilities attribute information wherein, the second domain be multicast data message aiming field, Huo Zhewei Multicast data message reaches the domain that aiming field needs to pass through；BFER sends multicast data message to the second domain.

Alternatively, the specific example in the present embodiment may be referred to described in above-described embodiment and optional embodiment Example, the present embodiment will not be repeated here.

Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims

A kind of 1. file transmitting method, it is characterised in that including：

Position index displaying duplication-convergence point device the BIER-RP in the first domain notices cross-domain multicast group address to controller；

The position index forwarding entry router BFIR in first domain cross-domain is transmitted to the multicast number in the second domain receiving request After message, the position index that the multicast data message is transmitted to first domain is forwarded egress router by the BFIR BFER, by the BFER by the multicast data packet forwarding to second domain.
2. according to the method for claim 1, it is characterised in that the position index displaying duplication-convergence point device in the first domain BIER-RP notices cross-domain multicast group address to controller to be included：

The BIER-RP notices cross-domain multicast group address by the BGP-LS agreements after extension to the controller.
3. according to the method for claim 2, it is characterised in that the Node Descriptor TLVs of the BGP-LS agreements In increase newly and have a sub- TLV, newly-increased sub- TLV is used to carry cross-domain multicast group address.
4. according to the method for claim 1, it is characterised in that the BFIR transmits the multicast data message to described The position index forwarding egress router BFER in the first domain includes：

The BFIR determines the BFER connected in first domain with second domain；

The BFIR transmits the multicast data message to the BFER connected with second domain.
5. according to the method for claim 1, it is characterised in that by the BFER by the multicast data packet forwarding to institute Stating the second domain includes：

The BFER judges whether second domain is adjacent with first domain；

In the case where judging that second domain is adjacent with first domain, the BFER transmits the multicast data message To the BFIR in second domain；

In the case where judging that second domain is not adjacent with first domain, the BFER leads to the multicast data message The 3rd domain is crossed to transmit to the BFIR in second domain, wherein, the 3rd domain connects with first domain and second domain respectively It is logical.
A kind of 6. file transmitting method, it is characterised in that including：

The position index forwarding egress router BFER in the first domain notices institute by the Routing Protocol after extension in first domain State BFER cross-domain capabilities attribute information；

Position index forwarding entry router BFIR in first domain is receiving multicast packet of the request transmission to the second domain During message, the BFER connected with second domain is determined, wherein, the cross-domain ability category that the BFIR passes through the BFER Property information judges whether the BFER connects with second domain；

The BFIR transmits the multicast data message to the BFER connected with second domain, by with described second The BFER of domain connection sends the multicast data message to second domain.
7. according to the method for claim 6, it is characterised in that the position index forwarding egress router BFER in the first domain passes through The cross-domain capabilities attribute information that Routing Protocol after extension notices the BFER in first domain includes：

The BFER in first domain notices the BFER by the BFIR of the Routing Protocol after extension into first domain Cross-domain capabilities attribute information.
8. according to the method for claim 7, it is characterised in that in the case where the Routing Protocol is ospf protocol, institute State to increase newly in the OSPF BIER Sub-TLV of ospf protocol and have sub- Sub-TLV, newly-increased sub- Sub-TLV is described for carrying BFER cross-domain capabilities attribute information.
9. according to the method for claim 7, it is characterised in that in the case where the Routing Protocol is ISIS agreements, institute State to increase newly in the ISIS BIER info Sub-TLV of ISIS agreements and have sub- Sub-TLV, newly-increased sub- Sub-TLV is used to carry institute State BFER cross-domain capabilities attribute information.
10. according to the method for claim 7, it is characterised in that in the case where the Routing Protocol is bgp protocol, institute State to increase newly in the BGP BIER info TLV of bgp protocol and have sub- TLV, newly-increased sub- TLV is used for the cross-domain energy for carrying the BFER Power attribute information.
11. according to the method for claim 7, it is characterised in that the cross-domain capabilities attribute information include be used for represent across First attribute field of domain capabilities attribute, the second attribute field for indicating whether to support forwarding equal cost multipath ECMP and For representing the 3rd field with the system information of the BFIR in second domain autonomous systems being connected.
A kind of 12. packet transmission device, it is characterised in that including：

First notification unit, for controlling the position index displaying duplication-convergence point device BIER-RP in the first domain to be noticed to controller Cross-domain multicast group address；

Transmission unit, request is cross-domain to be transmitted to the position index forwarding entry router BFIR for first domain receiving After the multicast data message in two domains, the BFIR is controlled to turn the position index that the multicast data message is transmitted to first domain Egress router BFER is sent out, by the BFER by the multicast data packet forwarding to second domain.
13. device according to claim 12, it is characterised in that first notification unit includes：

First announcement module, for control the BIER-RP by the BGP-LS agreements after extension to the controller notice across Domain multicast group address.
14. device according to claim 13, it is characterised in that the Node Descriptor of the BGP-LS agreements Being increased newly in TLVs has sub- TLV, and newly-increased sub- TLV is used to carry cross-domain multicast group address.
15. device according to claim 12, it is characterised in that the transmission unit includes：

Determining module, for the BFER for determining to connect with second domain in first domain by the BFIR；

First transport module, for being transmitted the multicast data message to the institute connected with second domain by the BFIR State BFER.
16. device according to claim 12, it is characterised in that the transmission unit includes：

Judge module, for judging whether second domain is adjacent with first domain by the BFER；

Second transport module, in the case where judging that second domain is adjacent with first domain, passing through the BFER The multicast data message is transmitted to the BFIR in second domain；

3rd transport module, in the case where judging that second domain is not adjacent with first domain, described in control BFER transmits the multicast data message to the BFIR in second domain by the 3rd domain, wherein, the 3rd domain respectively with First domain connects with second domain.
A kind of 17. packet transmission device, it is characterised in that including：

Second notification unit, for controlling the position index forwarding egress router BFER in the first domain to pass through the Routing Protocol after extension The cross-domain capabilities attribute information of the BFER is noticed in first domain；

Determining unit, for controlling the position index forwarding entry router BFIR in first domain receiving request transmission extremely During the multicast data message in the second domain, the BFER connected with second domain is determined, wherein, the BFIR passes through described BFER cross-domain capabilities attribute information judges whether the BFER connects with second domain；

Transmitting element, for controlling the BFIR to transmit the multicast data message to described in being connected with second domain BFER, by sending the multicast data message to second domain with the BFER that second domain connects.
18. device according to claim 17, it is characterised in that second notification unit includes：

Second announcement module, for controlling the BFER in first domain by the Routing Protocol after extension into first domain The BFIR notices the cross-domain capabilities attribute information of the BFER.
19. device according to claim 18, it is characterised in that in the case where the Routing Protocol is ospf protocol, Being increased newly in the OSPF BIER Sub-TLV of the ospf protocol has sub- Sub-TLV, and newly-increased sub- Sub-TLV is described for carrying BFER cross-domain capabilities attribute information.
20. device according to claim 18, it is characterised in that in the case where the Routing Protocol is ISIS agreements, Being increased newly in the ISIS BIER info Sub-TLV of the ISIS agreements has sub- Sub-TLV, and newly-increased sub- Sub-TLV is used to carry The cross-domain capabilities attribute information of the BFER.
21. device according to claim 18, it is characterised in that in the case where the Routing Protocol is bgp protocol, institute State to increase newly in the BGP BIER info TLV of bgp protocol and have sub- TLV, newly-increased sub- TLV is used for the cross-domain energy for carrying the BFER Power attribute information.
22. device according to claim 18, it is characterised in that the cross-domain capabilities attribute information include be used for represent across First attribute field of domain capabilities attribute, the second attribute field for indicating whether to support forwarding equal cost multipath ECMP and For representing the 3rd field with the system information of the BFIR in second domain autonomous systems being connected.
23. a kind of network architecture of the cross-domain forwarding of message, it is characterised in that including the stratification controller positioned at the first domain, position Index displaying duplication-convergence point device BIER-RP, position index forwarding entry router BFIR and position index forwarding outlet route Device BFER, wherein,

The stratification controller is used to manage cross-domain routing iinformation, network topological information and multicast group information；

The BIER-RP is connected with the stratification controller and the BFIR respectively, for leading to the stratification controller Cross-domain multicast group address is accused, cross-domain routing iinformation is sent to the second domain, the cross-domain route received is noticed in first domain Information；

The BFIR is connected with the stratification controller, for receive request transmit to the multicast packet in second domain During message, the multicast number is forwarded according to cross-domain multicast group address corresponding with the multicast data message and autonomous system information According to message to the corresponding BFER；

The BFER be used for will the multicast data packet forwarding that receive to second domain.
24. the network architecture according to claim 23, it is characterised in that the stratification controller includes SDN controllers With supernet controller, the supernet controller be used for cross-domain multicast group address based on the multicast data message and The system information in second domain generates the control information of the transmission route for indicating the multicast data message, and passes through institute State SDN controllers and issue the multicast data message and the control information to the BFIR.
25. the network architecture according to claim 24, it is characterised in that the BIER-RP passes through the BGP-LS after extension Agreement notices the system information in cross-domain multicast group address and second domain to the SDN controllers.
26. the network architecture according to claim 25, it is characterised in that the Node of the BGP-LS agreements Being increased newly in Descriptor TLVs has a sub- TLV, and newly-increased sub- TLV is used to carrying cross-domain multicast group address and second domain System information.
27. the network architecture according to claim 23, it is characterised in that the BFER is additionally operable to by the route after extension Agreement notices the cross-domain capabilities attribute information of the BFER to the BFIR in second domain.
28. the network architecture according to claim 27, it is characterised in that in the situation that the Routing Protocol is ospf protocol Under, being increased newly in the OSPF BIER Sub-TLV of the ospf protocol has sub- Sub-TLV, and newly-increased sub- Sub-TLV is used to carry institute State BFER cross-domain capabilities attribute information.
29. the network architecture according to claim 27, it is characterised in that in the situation that the Routing Protocol is ISIS agreements Under, being increased newly in the ISIS BIER info Sub-TLV of the ISIS agreements has sub- Sub-TLV, newly-increased sub- Sub-TLV to be used for Carry the cross-domain capabilities attribute information of the BFER.
30. the network architecture according to claim 27, it is characterised in that in the situation that the Routing Protocol is bgp protocol Under, being increased newly in the BGP BIER info TLV of the bgp protocol has sub- TLV, and newly-increased sub- TLV is used to carry the BFER's Cross-domain capabilities attribute information.
31. the network architecture according to claim 27, it is characterised in that the cross-domain capabilities attribute information includes being used for table Show the first attribute field of cross-domain capabilities attribute, for indicating whether to support the second attribute field for forwarding equal cost multipath ECMP And for representing the 3rd field with the system information of the BFIR in second domain autonomous systems being connected.