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A method for realizing bit index display replication and bit forwarding router

A technology of bits and routers, applied in the field of IP multicast, which can solve the problems of adding MPLS layer forwarding on the forwarding plane and the complexity of the control plane

Active Publication Date: 2020-08-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of the label concept brings complexity to the control plane, and also adds forwarding at the MPLS level to the forwarding plane.
For simple multicast application scenarios such as IPTV (Internet Protocol Television, Internet TV), the multicast source is relatively fixed, and the egress router of the multicast domain is also relatively fixed. In this scenario, it is not necessary to use complex MPLS as the control plane and data plane forwarding technology

Method used

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  • A method for realizing bit index display replication and bit forwarding router
  • A method for realizing bit index display replication and bit forwarding router
  • A method for realizing bit index display replication and bit forwarding router

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specific Embodiment 1

[0118] Currently, when the IS-IS protocol is extended to implement the BIER control plane, for IPv4 networks, the IS-IS protocol's ExtendedIP reachability (Extended IP reachability) TLV (Type\Lenght\Value, type\length\value) (TLV type is 135) and Multi-Topology Reachable IPv4 Prefixes (multi-topology reachable IPv4 prefix) TLV (TLV type is 235) has been extended; and for IPv6 networks, in IS-IS IPv6 Reachability TLV (TLV type is 236) and Multi -Topology Reachable IPv6 Prefixes TLV (TLV type is 237) has been extended, see the specific extension format Figure 4 .

[0119] The embodiment of the present invention attempts to reduce the support for the MPLS control plane and the data plane in the BIER domain in a relatively simple multicast network, and only uses the BIER header to forward the data plane. So on the above Figure 4 The IS-IS BIER Infosub-TLV defined in has been modified. The reference format of the sub-TLV message carrying BIER information is extended based on the IS-...

specific Embodiment 2

[0131] Currently, the OSPF protocol extension implements the BIER control plane. For IPv4 networks, it has been extended under the ExtendedPrefix TLV of OSPFv2; and for IPv6 networks, it has been extended under the Extended LSA TLV of OSPFv3. See the specific extension format Figure 5 .

[0132] The embodiment of the present invention attempts to reduce the support for the MPLS control plane and the data plane in the BIER domain in a relatively simple multicast network, and only uses the BIER header to forward the data plane. So on the above Figure 5 The BIER information sub-TLV of the OSPF protocol extension defined in the OSPF protocol has been modified, and the reference format of the sub-TLV message carrying BIER information based on the OSPF protocol extension is also as follows Picture 11 As shown, or as Picture 12 or Figure 13 Shown.

[0133] Among them, based on the format of the original BIER Info sub-TLV for OSPF (OSPF protocol extended BIER information sub-TLV) (such...

specific Embodiment 3

[0135] The OSPF protocol can support the establishment of OSPF virtual links on BFIR and BFER devices in the BIER domain. Through the virtual link, the extended TLV information mentioned in the embodiment of the present invention is directly sent to the edge devices in the BIER domain, and the BFIR and BFER devices directly interact with each other. BIER information reduces the information storage of intermediate nodes in the BIER domain. The advertised format is still based on the OSPF protocol extension. The reference format of the message carrying BIER information is also as follows Picture 11 or Picture 12 or Figure 13 Shown.

[0136] Among them, on the basis of the original BIER Info sub-TLV for OSPF format (such as Figure 5 ), two new fields are defined. Or a new BIER Info sub-TLV is defined. In addition to the information carried in the original BIER Info sub-TLV, two new fields are also defined. One is the M field, which identifies whether to use MPLS-BIER, that is, ...

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Abstract

The present invention proposes a method for realizing multicasting and a bit forwarding router. The method includes: obtaining the bit string length information related to the bit index display copy BIER on this node; Related information is encapsulated in the same BIER information type\length\value TLV; the TLV of the BIER information is notified through the routing protocol. The invention can reduce the support of MPLS control plane and data plane in BIER domain.

Description

Technical field [0001] The present invention relates to the field of IP multicast technology. More specifically, it is a method of implementing BitIndex Explicit Replication (BIER) technology in a non-MPLS (Multi-Protocol Label Switching, multi-protocol label switching) network. The bit index shows the method of copying and the bit forwarding router. Background technique [0002] BIER technology is a multicast technology that has been studied in the IETF in the past two years, such as figure 1 As shown, the basic principle is to assign a unique BFR-id (Bit-Forwarding Router Identifier) ​​to each node in the BIER domain. Each bit in the bit string (BitString) corresponds to A BFR-id. For example, the BitSting corresponding to BFR-1 with a BFR-id of 1 is 00001, the BitSting corresponding to BFR-2 with a BFR-id of 2 is 00010, and so on. When a multicast packet reaches BFR-1, BFR-1 acts as BFIR (Bit-Forwarding Ingress Router). BFR-1 determines which BFERs (Bit-Forwarding EgressRout...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/771H04L12/723H04L45/60H04L45/16H04L45/50H04L45/52
CPCH04L45/52H04L45/16H04L45/50
Inventor 王翠张征胡方伟黄孙亮
Owner ZTE CORP
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