WO2016198017A1 - Procédé et appareil de transmission d'une adresse de multidiffusion - Google Patents

Procédé et appareil de transmission d'une adresse de multidiffusion Download PDF

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Publication number
WO2016198017A1
WO2016198017A1 PCT/CN2016/086909 CN2016086909W WO2016198017A1 WO 2016198017 A1 WO2016198017 A1 WO 2016198017A1 CN 2016086909 W CN2016086909 W CN 2016086909W WO 2016198017 A1 WO2016198017 A1 WO 2016198017A1
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WO
WIPO (PCT)
Prior art keywords
group address
multicast group
protocol
bfr
igp
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PCT/CN2016/086909
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English (en)
Chinese (zh)
Inventor
胡方伟
张征
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中兴通讯股份有限公司
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Publication of WO2016198017A1 publication Critical patent/WO2016198017A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/12—Shortest path evaluation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/806—Broadcast or multicast traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1073—Registration or de-registration

Definitions

  • This document relates to, but is not limited to, the field of network communication, and in particular, to a method and device for transmitting a multicast address.
  • IP multicast technology enables efficient data transmission from point to point in IP networks. It can effectively save network bandwidth and reduce network load, so it has a wide range of applications in real-time data transmission, multimedia conferencing, data copying, IPTV (network TV), games and simulation.
  • a common feature of current multicast protocols is the need to construct a control plane multicast tree, which uses this multicast tree to logically network plane logic to achieve point-to-multipoint data forwarding and loop forwarding for multicast forwarding. Avoid, etc., the intermediate nodes of the multicast routing protocol with the distribution tree as the core need to maintain the state of complex multicast forwarding information. As the network size becomes larger and the multicast data traffic increases day by day, This kind of multicast technology faces more and more challenges in terms of cost and operation and maintenance.
  • Bit Indexed Explicit Replication Bit index-based explicit replication
  • This technology proposes a new multicast technology architecture that does not require building a multicast distribution tree.
  • a router that supports BIER technology is called a BFR (Bit-Forwarding Router).
  • a multicast forwarding domain consisting of BFRs is called a BIER domain.
  • the device that performs BIER encapsulation on the multicast data of the user equipment is called a BFIR (Bit-Forwarding Ingress Router), such as BFIR1 and BFIR2 in Figure 1, and decapsulates the BIER data packet.
  • BFIR Bit-Forwarding Ingress Router
  • the edge BFR device is called a BFER (Bit-Forwarding egress Router), such as BFER1 and BFER2 in FIG.
  • BFER Bit-Forwarding egress Router
  • the multicast data is encapsulated by the BFIR into the BIER domain, forwarded in the BIER domain depending on the header of the BIER, and exits the BIER domain via one or more BFER devices.
  • the device that receives and forwards the BIER message is called the transit BFR of the BIER message.
  • a BFR can be either a BFIR role or a BFER role, depending on the encapsulation and decapsulation messages.
  • BFR1 is an Ingress BFR
  • BFR5, BFR6, and BFR7 are Egress BFRs
  • the bit positions of the three BFRs are respectively 0001, 0010, 0100.
  • Egress BFR advertises its own bit in the BIER domain through an IGP (such as the IS-IS (Intermediate System to Intermediate System) protocol or the OSPF (Open Shortest Path First) protocol).
  • IGP such as the IS-IS (Intermediate System to Intermediate System) protocol or the OSPF (Open Shortest Path First) protocol.
  • BFR1 receives the BFR5, BFR6 and BFR7 bit position notifications, and saves this information in the local bit index forwarding table.
  • BFR1 When BFR1 receives a multicast packet and assumes that the multicast packet needs to be transmitted to BFR5 and BFR6, BFR1 calculates the value of the Bitstring of the packet as 0101 based on the previously saved mapping relationship.
  • the packet is encapsulated into a BIER packet.
  • the Bitstring in the BIER header is filled with 0101 and forwarded to BFR2.
  • BFR2 After receiving the packet, BFR2 searches for the entry in the previously stored bit index forwarding table. According to the entry, the packet needs to be forwarded to BFR3. Then, Bitstring is ANDed with the F-BM of the matching entry to obtain 0101.
  • BFR2 refills the BIER packet with 0101 as the Bitstring in the BIER Header, and forwards the packet to BFR3.
  • BFR3 After receiving the packet, BFR3 receives the packet. Find its own bit index forwarding table. BFR3 has 2 matching records, which represent the next hop of the packet forwarded to BFR4 and BFR6. For the first entry, BFR3 will make the value of Bitstring and the F-BM in the entry. And the operation, the result is 0001, in the second entry, the value of Bitstring and the result of the F-BM dosing operation is 0100, then BFR3 forwards the BIER message from the two interfaces to BFR4 and BFR6, respectively, where BFR4 BIER Header's Bitst The value of the ring is 0001, and the value of the Bitstring of the BIER Header forwarded to BFR6 is 0100.
  • the value of the Bitstring is the same as the bit position that it advertises. It indicates that it is the destination of the packet and decapsulates the BIER packet.
  • the packet forwarding method is forwarded to BFR5 according to the foregoing forwarding principle.
  • the BIER packet is decapsulated by the BFR5.
  • the multicast message is transmitted in the BIER domain, and the multicast packet is forwarded from the BFR1 node of the ingress to the receiving nodes BFR5 and BFR6 of the multicast.
  • the embodiment of the invention provides a method and a device for transmitting a multicast address, which can solve the problem that a leaf node in a multicast group acquires a multicast group address.
  • a method for transmitting a multicast address comprising:
  • the boundary bit forwarding router BFR carries the multicast group address information supported by the boundary BFR in the extended internal gateway protocol IGP packet;
  • the border BFR sends the IGP message carrying the multicast group address information to the bit-index-based explicit copy BIER network.
  • the boundary BFR is a bit index forwarding egress router
  • the border BFR sends the IGP packet carrying the multicast group address information to the bit-index-based explicit replication BIER network, including:
  • the bit index forwarding egress router uses the link state broadcast LSA to send the multicast group address information to each bit index forwarding ingress router;
  • the bit index forwarding egress router uses the link state protocol data unit LSP to transmit the multicast group address information to each bit index forwarding ingress router.
  • the method further includes:
  • bit index forwarding egress router When the bit index forwarding egress router receives the multicast registration message from the user equipment, the bit index is forwarded.
  • the egress router sends the multicast group address information registered by the user equipment, where the multicast group address information is used by the bit index forwarding ingress router to establish a bit index forwarding route prefix BFR-Prefix address with the bit index forwarding egress router. Mapping relations.
  • the border BFR carries the multicast group address information supported by the border BFR in the extended internal gateway protocol IGP packet, including:
  • the border BFR carries the multicast group address supported by the boundary BFR in the extended capability field of the OSPF protocol;
  • the border BFR carries the multicast group address supported by the boundary BFR in the routing capability field of the extended IS-IS protocol.
  • the routing capability field of the OSPF protocol or the routing capability field of the IS-IS protocol further includes description information of the multicast group address.
  • the description information of the multicast group address includes at least one of the following: type information of the field, data length information, group address type information, and number information of the multicast group address to be carried.
  • a multicast address transmission device includes:
  • the extension module is configured to carry the multicast group address information supported by the boundary BFR in the extended internal gateway protocol IGP packet;
  • the sending module is configured to send the IGP packet carrying the multicast group address to the BIER network.
  • the sending module is located in a bit index forwarding egress router
  • the sending, by the sending module, the IGP packet carrying the multicast group address to the BIER network includes:
  • the multicast group address information is sent to each bit index forwarding ingress router by using a link state broadcast LSA; the IGP is an intermediate system to an intermediate system IS-IS In the protocol, the multicast group address information is transmitted to each bit index forwarding ingress router by using a link state protocol data unit LSP.
  • the sending module is further configured to: when receiving the multicast registration message of the user equipment, Sending multicast group address information registered by the user equipment; the multicast group address information is used by the bit index forwarding ingress router to establish a mapping relationship with a bit index forwarding route prefix BFR-Prefix address of the bit index forwarding egress router .
  • the extension module carries the multicast group address information supported by the border BFR in the extended internal gateway protocol IGP packet, including:
  • the multicast group address supported by the boundary BFR is carried in the routing capability field of the extended OSPF protocol when the IGP is the open shortest path first OSPF protocol;
  • the multicast group address supported by the boundary BFR is carried in the routing capability field of the extended IS-IS protocol.
  • the routing capability field of the OSPF protocol or the routing capability field of the IS-IS protocol further includes description information of the multicast group address.
  • the description information of the multicast group address includes at least one of the following: type information of the field, data length information, group address type information, and number information of the carried multicast group address.
  • a computer readable storage medium storing computer executable instructions for performing the above method.
  • the embodiment of the present invention advertises the multicast group address information supported by the border BFR through the internal gateway protocol IGP, so that the leaf node in the multicast group obtains the multicast group address, which is simple and convenient.
  • FIG. 1 is a schematic diagram of a BIER network in the related art
  • FIG. 2 is a schematic diagram of a forwarding process of a BIER network in the related art
  • FIG. 3 is a flowchart of a method for transmitting a multicast address according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a BIER Group address (sub)-TLV (Type-Length-Value) format provided in an optional embodiment 1.
  • FIG. 5 is a schematic diagram of a network for advertising multicast address information using an IGP according to an alternative embodiment 2;
  • FIG. 6 is a schematic diagram of an OSPF Router (Information) Capabilities (Trivability) TLV format provided by an optional embodiment 2;
  • FIG. 7 is a schematic diagram of an IS-IS Router Capabilities TLV format provided by an alternative embodiment 3;
  • FIG. 9 is a structural diagram of a multicast address transmission apparatus according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for transmitting a multicast address according to an embodiment of the present invention.
  • the method shown in FIG. 3 includes steps 301-302:
  • Step 301 The boundary BFR carries the multicast group address information supported by the boundary BFR in the extended internal gateway protocol IGP packet.
  • Step 302 The border BFR sends the IGP packet carrying the multicast group address information to the BIER network.
  • the extended intra-interface protocol IGP packet carries the multicast group address information supported by the border BFR, so that the leaf node in the multicast group obtains the multicast group address, which is simple and convenient.
  • the boundary BFR is BFER
  • the border BFR sends the IGP packet carrying the multicast group address information to the bit-index-based explicit replication BIER network, including:
  • the bit index forwarding egress router uses the link state broadcast LSA to send the multicast group address information to each bit index forwarding ingress router;
  • the bit index forwarding egress router uses the link state protocol data unit LSP to send the multicast group address information to each bit index forwarding ingress router.
  • the BFER when the BFER sends the multicast group address information to the BFIR, the BFER uses the LSA or the LSP to transmit, so that the multicast group address information can be transmitted to the leaf node.
  • the bit index forwarding egress router when the bit index forwarding egress router receives the multicast registration message of the user equipment, the bit index forwarding egress router sends the multicast group address information registered by the user equipment; the multicast group address information is used to provide the The bit index forwarding ingress router establishes a mapping relationship with the BFR-Prefix (Bit Forwarding Router-Prefix) address of the bit index forwarding egress router.
  • the bit index forwarding ingress router may save the mapping relationship between the multicast group address information and the BFR-Prefix address of the BFER after receiving the multicast group address information sent by the BFER.
  • the border BFR carries the multicast group address information supported by the border BFR in the extended internal gateway protocol IGP packet, and may include:
  • the border BFR carries the multicast group address supported by the boundary BFR in the routing capability field of the extended OSPF protocol;
  • the border BFR carries the multicast group address supported by the boundary BFR in the routing capability field of the extended IS-IS protocol.
  • the routing capability field of the OSPF protocol or the routing capability field of the IS-IS protocol further includes description information of the multicast group address.
  • the description information of the multicast group address includes at least one of the following: type information of the field, data length information, group address type information, and number information of the carried multicast group address.
  • the Type type is expressed as BIER Group address sub-TLV, 8 bits.
  • the Lenth field is the total length of the sub-TLV, 16 bits.
  • the type of the multicast address is in the range of 1 to be an IPv4 address.
  • the value is 2, which is an IPv6 address.
  • Number of Group address Number of multicast group addresses carried.
  • This embodiment describes the flow of carrying a multicast group address through the extended OSPF protocol in conjunction with the networking diagram shown in FIG. 5.
  • BFIR1 and BFIR2 are bit index forwarding ingress routers, which are responsible for BIER encapsulation of Source (multicast source) data
  • BFER1 and BFER2 are bit index forwarding egress routers, and serve as user equipment (such as host1 in Figure 5).
  • a multicast access querier receives and sends an IGMP (Internet Group Management Protocol) message/MLD (Multicast Listener Discovery) protocol message to receive a group of multicast user equipments. Broadcast group registration and revocation messages.
  • IGMP Internet Group Management Protocol
  • MLD Multicast Listener Discovery
  • the process includes the following steps 201-205.
  • BFER1 obtains an IGMP/MLD registration message sent by the user equipment.
  • the BFER1 finds that a new multicast group user equipment is added according to the received registration message. If the multicast network of the Protocol Independent Multicast (PIM) protocol is enabled in the related art, the querier will use the PIM. The protocol sends a multicast group join message. In this embodiment, the BIER protocol is used to replace the PIM protocol. The BFER needs to use the extended OSPF protocol to advertise the multicast group address information in this embodiment.
  • PIM Protocol Independent Multicast
  • BFER1 constructs a BIER Group Address sub-TLV according to FIG. 4 and fills it into the OSPF Router Informational Capability TLV shown in FIG. 6.
  • Shortest path first protocol graceful restart capability 1 Shortest path first protocol gracefully restarts helpers 2 Shortest path priority protocol stub router support 3 Shortest path priority protocol traffic engineering support
  • BFER1 floods the filled OSPF Router Informational Capability TLV to BFIR1 and BFIR2 by the corresponding LSA.
  • the BFIR1 and the BFIR2 After receiving the LSA sent by the BFER1, the BFIR1 and the BFIR2 extract the corresponding BIER Group address sub-TLV, and locally save the newly registered multicast group address and the BFR-prefix address mapping relationship of the BFER1 to complete the multicast group address. Announcement in the BIER domain by the extended OSPF protocol. When a multicast packet is sent to the multicast user equipment, BFIR1 and BFIR2 complete the encapsulation and forwarding of the corresponding BIER packet according to the mapping relationship.
  • This embodiment describes the process of advertising a multicast group address by using the IS-IS protocol, including the following steps 301-305.
  • the new user equipment (such as host) sends an IGMP/MLD registration message to the querier BFER1.
  • BFER1 finds that a new multicast group user equipment is added. If the PIM protocol is used in the related art, the querier sends a multicast group join message by using the PIM protocol.
  • the BIER protocol is used to replace the PIM protocol.
  • the BFER needs to use the method of the IS-IS protocol extension to advertise the multicast group address information in this embodiment.
  • BFER1 constructs a BIER Group Address sub-tlv according to FIG. 4 and fills it into the IS-IS router capability TLV shown in FIG.
  • IPv4 Process Engineering - Mesh - Group TLV
  • IPv6 Process Engineering - URL - Group TLV
  • Path calculation unit finds sub-TLV 6
  • Alias 7 tree IPv4 traffic engineering router ID
  • IPv6 traffic engineering router ID IPv6 traffic engineering router ID 13
  • Multipath transparent transmission version 14
  • Virtual LAN group 15
  • Interest tags and distribution tree roots 16 Routing bridge channel protocol 17 Affinity 18 Label group
  • BFER1 floods the filled IS-IS Router Capability TLV from the corresponding LSA to BFIR1 and BFIR2.
  • BFIR1 and BFIR2 After receiving the LSP message sent by BFER1, BFIR1 and BFIR2 extract the corresponding BIER Group address sub-TLV, and locally save the newly registered multicast group address and the BFR-Prefix address mapping relationship of BFER1 to complete the group.
  • the broadcast group address extends the announcement in the BIER domain through the IS-IS protocol.
  • the flow of the multicast stream data forwarding described in this embodiment in conjunction with the flowchart shown in FIG. 8 includes steps Steps 401 to 407:
  • the source (multicast source) has a multicast stream that needs to be sent to the user equipment of the multicast group, and the multicast source sends the multicast stream data to the bit index forwarding ingress router BFIR1 of the BIER domain. It is possible that the multicast source is not directly connected to the ingress router and is forwarded to the BFIR1 through other network devices. This scenario does not affect the effect of this embodiment.
  • the BFIR1 After the BFIR1 receives the multicast stream data sent by the multicast source, the BFIR1 searches the mapping table locally according to the multicast group address in the multicast stream data.
  • the mapping table is constructed according to the method described in the optional embodiment 2.
  • the BFIR1 router encapsulates the BIER packet header according to the BFR-Prefix address.
  • BFIR1 forwards the encapsulated BIER packet to the BIER network, and the packet is forwarded to BFR1.
  • BFR1 After receiving the BIER message sent by BFIR1, BFR1 sends the BIER message to BFR2 according to the forwarding principle of BIER;
  • BFR2 and BFR1 do similar processing, according to the BIER forwarding principle, the BIER message is forwarded to the bit index forwarding egress router BFER1;
  • the BFER1 strips the BIER packet header to obtain the original encapsulated multicast stream packet.
  • the BFER1 forwards the multicast stream packet to the multicast user equipment host1, and completes the forwarding of the entire multicast stream packet.
  • FIG. 9 is a structural diagram of a multicast address transmission apparatus according to an embodiment of the present invention. As shown in FIG. 9, the transmission device includes:
  • the extension module 901 is configured to carry the multicast group address information supported by the boundary BFR in the extended internal gateway protocol IGP packet;
  • the sending module 902 is configured to send the IGP packet carrying the multicast group address information to the BIER network.
  • the sending module 902 is located in the bit index forwarding egress router.
  • the sending, by the sending module 902, the IGP packet carrying the multicast group address to the BIER network includes:
  • the LSA is broadcasted through the link state. Transmitting the multicast group address information to each bit index forwarding ingress router; when the IGP is an intermediate system to an intermediate system IS-IS protocol, the multicast group address is obtained by using a link state protocol data unit LSP Information is sent to each bit index forwarding ingress router
  • the sending module 902 is further configured to: when receiving the multicast registration message of the user equipment, send the multicast group address information registered by the user equipment; the multicast group address information is used for the bit
  • the index forwarding ingress router establishes a mapping relationship with the bit index forwarding route prefix BFR-Prefix address of the bit index forwarding egress router.
  • the bit index forwarding ingress router after receiving the multicast group address information sent by the egress router, saves the multicast group address information and the BFR of the bit index forwarding egress router. -Prefix address mapping.
  • the extension module carries the multicast group address information supported by the border BFR in the extended internal gateway protocol IGP packet, including:
  • the extended OSPF protocol routing capability field carries the multicast group address supported by the boundary BFR; and the IGP is an intermediate protocol-intermediate protocol IS-IS In the protocol, the multicast group address supported by the border BFR is carried in the routing capability field of the extended IS-IS protocol.
  • the routing capability field of the OSPF protocol or the routing capability field of the IS-IS protocol further includes description information of the multicast group address.
  • the description information of the multicast group address includes at least one of the following: type information of the field, data length information, group address type information, and number information of the carried multicast group address.
  • the device provided by the embodiment of the present invention advertises the multicast group address information supported by the border BFR through the extended internal gateway protocol IGP, so that the leaf node in the multicast group obtains the multicast group address, which is simple and convenient.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
  • the devices, functional modules, and functional units in the above embodiments may be implemented by using a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the devices, functional modules, and functional units in the above embodiments may be stored in a computer readable storage medium when implemented in the form of software functional modules and sold or used as separate products.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • a computer readable storage medium storing computer executable instructions for performing the above method.
  • the embodiment of the present invention advertises the multicast group address information supported by the border BFR through the internal gateway protocol IGP, so that the leaf node in the multicast group obtains the multicast group address, which is simple and convenient.

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Abstract

Procédé et appareil de transmission d'une adresse de multidiffusion. Le procédé comporte les étapes suivantes: un routeur de réexpédition de bits (BFR) périphérique transporte, dans un paquet étendu de protocole de passerelle interne (IGP), des informations d'adresse de groupe de multidiffusion prises en charge par ledit BFR périphérique; et le BFR périphérique envoie à un réseau basé sur une réplication explicite indexée par bits (BIER) ledit paquet IGP transportant lesdites informations d'adresse de groupe de multidiffusion.
PCT/CN2016/086909 2015-10-16 2016-06-23 Procédé et appareil de transmission d'une adresse de multidiffusion WO2016198017A1 (fr)

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