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Method for realizing bit index display copying and bit forwarding router

A bit and router technology, applied in the field of IP multicast, which can solve the problems of increasing MPLS layer forwarding on the forwarding plane and the complexity of the control plane.

Active Publication Date: 2017-04-19
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 Forwarding technology on plane and data plane

Method used

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  • Method for realizing bit index display copying and bit forwarding router
  • Method for realizing bit index display copying and bit forwarding router
  • Method for realizing bit index display copying 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 an IPv4 network, in the IS-IS protocol Extended IP reachability (extended IP reachability) TLV (Type\Lenght\Value, type\length\value) (TLV type 135) and Multi-Topology Reachable IPv4 Prefixes (Multi-Topology Reachable IPv4 Prefixes) TLV (TLV type is 235); and for IPv6 networks, in IS-IS IPv6 Reachability TLV (TLV type is 236) and The Multi-Topology Reachable IPv6 Prefixes TLV (TLV type is 237) has been extended. For the specific extension format, see 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 use the BIER header to forward the data plane. So for the above Figure 4 The IS-IS BIER Info sub-TLV defined in has been modified. Specifically, the reference format of the sub-TLV message carrying BIER information based on ...

specific Embodiment 2

[0131] Currently, the OSPF protocol extension implements the BIER control plane. For the IPv4 network, it is extended under the Extended Prefix TLV of the OSPFv2 protocol; and for the IPv6 network, it is extended under the Extended LSA TLV of OSPFv3. For the specific extension format, see 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 use the BIER header to forward the data plane. So for the above Figure 5 The BIER information sub-TLV of the OSPF protocol extension defined in 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 Figure 11 as shown, or as Figure 12 or Figure 13 shown.

[0133] Among them, on the basis of the format of the original BIER Info sub-TLV for OSPF (OSPF protocol extended BIER infor...

specific Embodiment 3

[0135] The OSPF protocol can support the establishment of an OSPF virtual link on the 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 device in the BIER domain, and the BFIR and BFER devices directly interact with each other. BIER information, reducing 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 Figure 11 or Figure 12 or Figure 13 shown.

[0136] Among them, based on the format of the original BIER Info sub-TLV for OSPF (such as Figure 5 ), which defines 2 new fields. Or define a new BIER Info sub-TLV, in addition to carrying the information carried in the original BIERInfo sub-TLV, it also defines 2 new fields. One is the M field, indicating whether to use MPLS-...

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Abstract

The invention discloses a method for realizing multicast and a bit forwarding router. The method includes the steps of obtaining bit string length information related with bit index display copying BIER on the node, packaging the BIER related information of the bit string length information in the type / length / value TLV of same BIER information, and notifying the TLV of the BIER information through a route protocol. Support of MPLS control surface and data surface in a BIER domain can be reduced.

Description

technical field [0001] The present invention relates to the technical field of IP multicasting, more specifically, it is a kind of display replication (Bit Index Explicit Replication, referred to as BIER) technology in non-MPLS (Multi-Protocol Label Switching, Multi-Protocol Label Switching) network A method for realizing bit index display replication and a 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-ForwardingRouter Identifier) ​​to each node in the BIER domain, and each Bit in the bit string (BitString) corresponds to a BFR-id. For example, the BitSting corresponding to BFR-1 with BFR-id 1 is 00001, the BitSting corresponding to BFR-2 with BFR-id 2 is 00010, and so on. When a multicast packet arrives at BFR-1, BFR-1 acts as a BFIR (Bit-Forwarding Ingress Router, bit-forwarding ingress...

Claims

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Application Information

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Patent Type & Authority Applications(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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