CN105450493B - Virtual Private LAN Service implementation method and its device based on DOCSIS - Google Patents

Abstract

The present invention provides the implementation methods and its communication device of a kind of Virtual Private LAN Service VPLS based on data over cable service interface specification, by obtaining cable modem configuration files, configuration file includes the VPLS signaling parameter encoded information for establishing two-layer virtual private network, a type lengths values TLV of network system interface NSI encapsulation can be used to define for identifying VPLS signaling parameter encoded information, the aforementioned TLV that states can further comprise several subtype length value SubTLV, it is respectively used to identify specific VPLS signaling parameter option, such as access circuit group mark AGI, the peer IP address list of netted pseudo-wire, pseudo-wire type, control word etc., such provider edge router PE can be with net according to these VPLS signaling parameter encoded informations Other PE creation and maintenance pseudo-wire PW in network.

Description

Virtual Private LAN Service implementation method and its device based on DOCSIS

Technical field

The present invention relates to fields of communication technology, more particularly to one kind to be based on data over cable service interface specification DOCSIS Virtual LAN services implementation method and its device.

Background technique

Network flow based on packet switch exponentially increases, and is largely based on Ethernet or IP, city in these flows Rapid growth of the domain Ethernet service in enterprise market is mainly since enterprise customer is familiar with Ethernet and Ethernet Support to various existing equipments.Simultaneously enterprise market also integrating IP phone and data network, with the metropolitan area based on QoS with Too net is as access means.

Just because of the increase of the demand of Metro Ethernet, telecom operators start to consider how based on various network shapes one after another Formula provides carrier ethernet business, wherein data over cable service interface specification DOCSIS is one by wire cable mark The international standard that quasi- tissue Cable Labs is formulated, it is therefore an objective to establish a whole set of agreement in hybrid fiber coax HFC Upper carry out high speed and bidirectional data transfers provide the service such as Internet for user, while making the cable modem of each producer Device CM product has sufficient compatibility, and DOCSIS standard is mainly supported between computer network and cable television network, Yi Jiyou The transmission of IP data packet is realized between line television headend (or optical node of HFC) and user.

Currently, provide the Ethernet local area network ELAN's of MEF Metro Ethernet Forum suggestion based on DOCSIS interface specification Realization is the two-layer virtual private network L2VPN mode using IETF, and Cablabs defines subtype for encoding L2VPN phase Parameter is closed, such as: VPN Identifier, network system interface NSI encapsulation, access circuit group ID etc..

However, still there are also other widely used L2VPN models to define in docsis specification not yet, such as: VPLS Virtual Private LAN Service model, it is that how point-to-multipoint a kind of two-layer virtual for providing in common network be dedicated Network service, VPLS enables the user site being geographically isolated to be connected by MAN/WAN, and imitates the connection between each website Fruit is as in a LAN.

Currently, if cable television operators plan deployment VPLS business, they can only be carried out by way of order line Manual system configuration, this configuration mode is there are two disadvantage: the order inputted first, by order line all without standardization, Therefore cable television operators have to develop and safeguard respectively incompatible command set for the equipment of different vendor；Its Secondary, the execution speed in such a way that order line inputs configuration order is slow.

Summary of the invention

The present invention is intended to provide a kind of virtual LAN services VPLS for meeting data over cable service interface specification is real Existing technical solution.

According to an aspect of the present invention, it provides here and realizes the void based on DOCSIS in a kind of provider edge router The method of quasi- private LAN service, comprising: obtain cable modem configuration files, the configuration file includes for building The VPLS signaling parameter encoded information of vertical two-layer virtual private network；It is created and is tieed up according to the VPLS signaling parameter encoded information It protects and establishes and safeguard VPLS network in pseudo-wire, with network between other provider edge routers.

Preferably, the type lengths values TLV definition that aforementioned arrangements file is encapsulated using network system interface NSI is used for Identify VPLS signaling parameter encoded information.Aforementioned type length value TLV further comprises several subtype length value SubTLV, point Specific VPLS signaling parameter option Yong Yu not identified.

Aforementioned VPLS signaling parameter includes following option information: access circuit group mark AGI, virtual special for label one With LAN service example；The peer IP address list of netted pseudo-wire or/and the peer IP address list of spoke pseudo-wire, for marking The IP address list for knowing the opposite end pseudo-wire PW, is respectively used to set up the netted pseudo-wire of Virtual Private LAN Service or/and spoke Pseudo-wire；

Preferably, aforementioned VPLS signaling parameter can further comprise following option information: pseudo-wire type, for marking pseudo-wire Message packaged type in PW；Control word uses in pseudo-wire PW encapsulation for marking of control word.

According to another aspect of the present invention, a kind of Virtual Private LAN Service based on DOCSIS is provided here Communication equipment, it includes: storage device, has corresponding cable modem configuration files, and the configuration file includes using In the VPLS signaling parameter encoded information for establishing two-layer virtual private network；Resolver, for parsing in aforementioned arrangements file VPLS signaling parameter；Virtual switch unit creates according to the VPLS signaling parameter encoded information and safeguards pseudo-wire, with network In establish between other provider edge routers and maintenance VPLS network.

Preferably, aforementioned arrangements file is fixed using a sub- type lengths values Sub TLV of network system interface NSI encapsulation Justice is for identifying VPLS signaling parameter coding.

Preferably, aforementioned VPLS signaling parameter includes following option: access circuit group mark AGI is used for one void of label Quasi- private LAN service example；The peer IP address list of netted pseudo-wire or/and the peer IP address list of spoke pseudo-wire are used IP address list in the mark opposite end pseudo-wire PW, be respectively used to set up the netted pseudo-wire of Virtual Private LAN Service or/and Spoke pseudo-wire.

Preferably, the VPLS signaling parameter further comprises following option: pseudo-wire type, for marking in pseudo-wire PW Message packaged type；Control word uses in pseudo-wire PW encapsulation for marking of control word.

Detailed description of the invention

By the detailed description with the accompanying drawing being set forth below, feature of the invention, property and advantage will become brighter It is aobvious, identical element mark having the same in attached drawing, in which:

Fig. 1 is DPOE system structure diagram provided by the present invention；

Fig. 2 is the DPOE central office system structural schematic diagram of the VPLS signalling coding the present invention is based on DOCSIS；

Specific embodiment

With reference to the accompanying drawing, the preferred embodiment of the present invention is described in detail.

Fig. 1 is DPOE system structure diagram provided by the present invention, and DPOE system generally refers to meet wire cable number It is to be proposed by several companies, and be responsible for by Cable Labs according to the EPON system of Transmission system service interface specification (DOCSIS) What leader pushed, with the media access in the existing passive optical network (EPON, GEPON or10GigEPON) based on Ethernet MAC layer and physical PHY layer standard are controlled to realize a passive optical network of DOCSIS service layer interface.DPOE system packet Include the background management system being made of similar tftp server, DPOE central office system, optical user unit ONU 1...ONUn, with And the user equipment of the aforementioned ONU of connection.

DPOE system maintains the existing operation management platform based on DOCSIS of Cable operator, and with OLT and ONU Between optical fiber physical media and respective physical interface specification and bring high bandwidth capability replace the finite bandwidth based on HFC. DPOE technology makes the OLT of EPON as docsis cable modem terminal system (CMTS) platform, and ONU/ONT is then Can correspond to CM, OLT by central office system analog coaxial cable modem vCM to realize in traditional CMTS system In cable modem CM function, DPOE central office system plays the part of a provider edge router PE, is responsible for vpn service Access, it completes message from private network to public network tunnel, and mapping and forwarding from public network tunnel to private network.

DOCSIS standard regulation, all cable modem CM for meeting DOCSIS standard on it before line must first from A CM configuration file is downloaded on tftp server, this CM configuration file contains the various work of cable modem CM Parameter and relevant information, for example, cable modem CM uplink and downlink rate, allow to access cable modem CM's Customer equipment CPE number and the permission etc. for having connected CPE access network.

In the initialization procedure of the side ONU, the dummy coaxial cable modem vCM in DPOE central office system is to management System initiates F fourth P request, and it not only includes fortune in CM configuration file that DPOE central office system, which obtains CM configuration file from the management system, Battalion quotient is the Service Properties and parameter that the user connected on ONU provides, and will further comprise based on the virtual of DOCSIS standard The signalling coding parameter configuration of private LAN service VPLS.VPLS technology belongs to two layers of packet bearer technology, substantially It is a kind of Layer 2 virtual private network L2VPN technology based on IP/MPLS and ethernet technology, it is by utilizing related signaling agreement It is established between the PE node in VPLS example and safeguards PW (pseudo-wire), will transmitted, exchange on PW after the encapsulation of two-layer protocol frame, Make to establish the PW connected entirely between each PE, provides a user virtual Ethernet service.

In DCSIS L2VPN standard criterion, NSI encapsulated type is defined as subtype " 43.5.2 ", its support is being The L2VPN service of multiple packing forms is provided on system network interface, such as: IEEE802.1Q, 802.1ad, 802.1ah, MPLS.

Provided embodiment according to the present invention, defined on the basis of the NSI of standard encapsulates subtype one it is new Subtype length value Sub-TLV is used to support the signalling coding of VPLS, notices VPLS system relevant parameter, such as pseudo-wire ID, control Word processed and interface parameters etc..VPLS technology can realize that automatically control is flat using the signaling mechanism of LDP agreement or bgp protocol Face, BGP signaling mechanism protocol realization is complicated, and it is more demanding to PE equipment performance, realize that overall cost is higher, in actual deployment Shi Tongchang uses LDP signaling mechanism, which realizes simply, but cannot achieve node and find automatically, can only use and manually match Other protocol modes etc. are set or introduced, and when change in topology, it is big and complicated to modify configuration work amount by hand, and matched by vCM It sets and corresponding LDP signalling coding parameter is provided in file, so as to overcome the efficiency in configuration, it is not needed by input Order line configures virtual special local area network, especially to overcome the business configuration under multisystem carrier network environment difficult Degree problem.

Provided embodiment according to the present invention, we define the VPLS signalling coding of corresponding type lengths values TLV Parameter, type can be " 43.5.2.9 ", wherein TLV can further provide for following different subtype length value Sub-TLV VPLS signaling parameter the encoding option or combinations thereof coding is described:

1. accessing circuit group mark AGI (Attachment Group Identifier)

Subtype: " 43.5.2.9.1 "

The subtype will define a Virtual Private LAN Service example

The string format of eight bit byte group,<AGI type><AGI value>, wherein AGI type can refer to interconnection network data The definition of distributor gear IANA, it is a byte length, and AGI value is variable-length, such as: AGI type is 0x01, AGI value The route-distinguisher of 8 bytes is encoded, then the subtype length is 9 bytes.

2. the peer IP address list of netted pseudo-wire (Mesh PW)

Subtype: " 43.5.2.9.2 "

The subtype will define the IP address list of netted pseudo-wire opposite end in CMTS or DPoE system, be believed according to these addresses Breath, system will set up the netted pseudo-wire of hierarchical virtual private LAN service.

Length: two bytes (byte) add 4/16 integral multiple byte；

Codomain, the first byte can be " 1 " or " 2 " wherein, and it is the address IPv4 that value " 1 ", which can indicate to carry in the subtype, List, it is IPv6 address list that value " 2 ", which can indicate to carry in the subtype,；Second byte is for identifying peer IP address list Length, wherein if aforementioned first byte is " 1 ", the mark peer IP address list length in the second byte by be 4 integer Times, if aforementioned first byte is " 2 ", the mark peer IP address list length in the second byte by be 16 integral multiple；Value Remaining byte will indicate the address opposite end IPv4/IPv6 in domain

3. the peer IP address list of spoke pseudo-wire (Spoke PW)

Subtype: " 43.5.2.9.3 "

The subtype will define the IP address list of spoke pseudo-wire opposite end in CMTS or DPoE system, be believed according to these addresses Breath, the spoke pseudo-wire that system will be set up in hierarchical virtual private LAN service.

Length: two bytes (byte) add 4/16 integral multiple byte；

Codomain, the first byte can be " 1 " or " 2 " wherein, and it is the address IPv4 that value " 1 ", which can indicate to carry in the subtype, List, it is IPv6 address list that value " 2 ", which can indicate to carry in the subtype,；Second byte is for identifying peer IP address list Length, wherein if aforementioned first byte is " 1 ", the mark peer IP address list length in the second byte by be 4 integer Times, if aforementioned first byte is " 2 ", the mark peer IP address list length in the second byte by be 16 integral multiple；Value Remaining byte will indicate the address opposite end IPv4/IPv6 in domain

4. pseudo-wire type (PW Type)

Subtype: " 43.5.2.9.4 "；

In general, the message packaged type on pseudo-wire PW can also be divided into two kinds: Ethernet Ethernet mode and VLAN mould Formula.Wherein: there are two types of operational modes for Ethernet pseudo-wire: Tagged mode and Raw mode, each frame is necessary in Tagged mode VLAN tag comprising at least one 802.1Q, and label value to the Internet Service Provider (NSP) on pseudo-wire destination node all It is significant, in Raw mode a frame be possible to can include 802.1Q VLAN tag, but the tag is nonsensical to NSP, NSP can pellucidly transmit these tag.

Length a: byte (byte)；

Codomain is " 4 " or " 5 ", wherein value " 4 " can indicate Tagged mode, and value " 5 " can indicate Raw mode, if in CM Lack the subtype in file, CMTS or DPoE system will be default to think using Raw mode.

5. control word

Subtype: " 43.5.2.9.5 "；

The subtype will be used for marking of control word and use in pseudo-wire PW encapsulation.

Length a: byte (byte)；

Codomain is Boolean variable value, is used to indicate whether to require control word, if its value is " 1 ", CMTS or DPoE system Need to send a signal to all MPLS puppet line ends, to inform that control word uses in pseudo-wire encapsulation；If its value is " 0 ", CMTS Or DPoE system needs to send a signal to all MPLS puppet line ends to inform that control word does not use in pseudo-wire encapsulation, if in CM Lack the subtype in file, CMTS or DPOE system will be default to think that its value is " 0 ".

Fig. 2 is the VPLS signalling coding DPOE central office system structural schematic diagram provided by the present invention based on DOCSIS, figure DPOE central office system plays the part of an IP/MPLS supplier edge router PE in example, it includes storage device, resolver, with And virtual switch instance VSI, in which:

Storage device has the corresponding corresponding CM cable modem configuration files of ONU1, ONU2, the configuration file packet The VPLS signaling parameter encoded information for establishing two-layer virtual private network is included, in general, virtual same in EPON central office system ONU1, ONU2 of shaft cable modem vCM simulation distal end play the part of a Customer Edge router CE, power in an ONU When during register initial, vCM obtains CM configuration file corresponding to the ONU from the background management system.

Resolver obtains therein for establishing two-layer virtual private network for parsing aforementioned CM configuration file VPLS signaling parameter encoded information, VPLS signaling parameter include following option, such as: access circuit group identifies AGI, netted pseudo-wire Peer IP address list and/or spoke pseudo-wire peer IP address list, pseudo-wire type, control word etc..

Virtual switch instance VSI, according to aforementioned resolution unit VPLS signaling parameter obtained, it is created and maintenance PW, And then the practical access circuit AC (Attachment Circuit) of VPLS is mapped to each item void established and chained by it, AC Corresponding access circuit interface can be actual physical interface, be also possible to virtual interface.

Provided embodiment according to the present invention, virtual switch instance VSI is according to dummy coaxial cable modem The signaling parameter of VPLS in the CM1 configuration file of vCM configures, it creates and safeguard netted pseudo-wire, in this way, access circuit AC1 On all user's messages generally require it is intact opposite end website is forwarded to by the netted pseudo-wire, meanwhile, come from The user's message of opposite end website will also be forwarded to corresponding access circuit AC1 by virtual switch instance.

Provided embodiment according to the present invention, virtual switch instance VSI is according to dummy coaxial cable modem The signaling parameter of VPLS in the CM2 configuration file of vCM configures, it creates and safeguard spoke pseudo-wire, in this way, access circuit AC2 On all user's messages generally require it is intact opposite end website is forwarded to by the spoke pseudo-wire, meanwhile, come from The user's message of opposite end website will also be forwarded to corresponding access circuit AC2 by virtual switch instance.

Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be by Software adds the mode of required hardware platform to realize, naturally it is also possible to all implemented by hardware, but in many cases before Person is more preferably embodiment.Based on this understanding, technical solution of the present invention contributes to background technique whole or Person part can be embodied in the form of software products, which can store in storage medium, such as ROM/RAM, magnetic disk, CD etc., including some instructions are used so that a computer equipment (can be personal computer, service Device or the network equipment etc.) execute method described in certain parts of each embodiment of the present invention or embodiment.

The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, although implementing referring to preferable Invention is explained in detail for example, those skilled in the art should understand that: it still can be to of the invention Technical solution is modified or replaced equivalently, and these modifications or equivalent replacement cannot also make modified technical solution de- Spirit and scope from technical solution of the present invention.

Claims (10)

1. a kind of method for realizing the Virtual Private LAN Service VPLS based on DOCSIS in provider edge router, special Sign is:

Cable modem configuration files are obtained, the configuration file includes the VPLS for establishing two-layer virtual private network Signaling parameter encoded information；

According to the VPLS signaling parameter encoded information create and safeguard pseudo-wire, with network in other provider edge routers it Between establish and maintenance VPLS network.

2. the method as described in claim 1, it is characterised in that the configuration file uses the one of network system interface NSI encapsulation A type lengths values TLV definition is for identifying VPLS signaling parameter encoded information.

3. method according to claim 2, it is characterised in that the type lengths values TLV further comprises that several subtypes are long Angle value SubTLV is respectively used to identify specific VPLS signaling parameter option.

4. the method according to claim 1, it is characterised in that the VPLS signaling parameter includes following option Information:

Circuit group mark AGI is accessed, one Virtual Private LAN Service example of label is used for；

At least one of peer IP address list and the peer IP address list of spoke pseudo-wire of netted pseudo-wire, the netted puppet At least one of the peer IP address list of line and the peer IP address list of the spoke pseudo-wire are for identifying PW pairs of pseudo-wire The IP address list at end, the peer IP address list of the netted pseudo-wire is for setting up the netted of Virtual Private LAN Service The peer IP address list of pseudo-wire and the spoke pseudo-wire is used to set up the spoke pseudo-wire of Virtual Private LAN Service.

5. method as claimed in claim 4, it is characterised in that the VPLS signaling parameter further comprises following option information:

Pseudo-wire type, for marking the message packaged type in pseudo-wire PW；

Control word parameter, for marking of control word whether pseudo-wire PW encapsulation in use.

6. a kind of communication equipment of the Virtual Private LAN Service based on DOCSIS, characterized by comprising:

Storage device has corresponding cable modem configuration files, and the configuration file includes for establishing two layers of void The VPLS signaling parameter encoded information of quasi- dedicated network；

Resolver, for parsing the VPLS signaling parameter in aforementioned arrangements file；

Other Provider Edge roads in virtual switch unit, the creation of VPLS signaling parameter encoded information and maintenance pseudo-wire, with network By VPLS network is established and safeguarded between device.

7. communication equipment as claimed in claim 6, it is characterised in that the configuration file is encapsulated using network system interface NSI A sub- type lengths values Sub TLV define for identifying VPLS signaling parameter encoded information.

8. communication equipment as claimed in claim 7, it is characterised in that the VPLS signaling parameter includes following option:

It accesses circuit group and identifies AGI, be used for one Virtual Private LAN Service example of label；

At least one of peer IP address list and the peer IP address list of spoke pseudo-wire of netted pseudo-wire, the netted puppet At least one of the peer IP address list of line and the peer IP address list of the spoke pseudo-wire are for identifying PW pairs of pseudo-wire The IP address list at end, the peer IP address list of the netted pseudo-wire is for setting up the netted of Virtual Private LAN Service The peer IP address list of pseudo-wire and the spoke pseudo-wire is used to set up the spoke pseudo-wire of Virtual Private LAN Service.

9. communication equipment as claimed in claim 8, it is characterised in that the VPLS signaling parameter further comprises following option:

Pseudo-wire type, for marking the message packaged type in pseudo-wire PW；

Control word parameter, for marking of control word whether pseudo-wire PW encapsulation in use.

10. the communication equipment as described in any claim of claim 6 to 9, it is characterised in that the communication equipment be CMTS or The DPoE system local side network equipment.