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Method and network device for configuring RD (route distinguisher)

A technology of identifiers and routing, applied in the field of communication, can solve problems such as no longer applicable, insufficient space, etc.

Active Publication Date: 2012-10-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] 1) The RD type with Type Field 0 can provide 2 to the power of 32 independent RDs for the same Administrator Subfield, which is enough to support a large number of VPN instances, but only supports 2-byte AS numbers, and is deployed with 4-byte AS numbers The gradual increase of will no longer apply
[0021] 2) For RD types with Type Field 1 and 2, the RD space provided by the same Administrator Subfield is only 2 to the 16th power, a total of 65,535 independent RDs; however, in future application scenarios such as data center interconnection and cloud VPN, The network may need to support 100,000 or more massive VPN instances, and there will be insufficient space for these two types of RDs in the future

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  • Method and network device for configuring RD (route distinguisher)
  • Method and network device for configuring RD (route distinguisher)
  • Method and network device for configuring RD (route distinguisher)

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Embodiment Construction

[0061] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. However, it should be noted that the following embodiments are only examples for helping to understand the technical solutions, and are not intended to limit the present invention.

[0062] In the current packet format defined by the Border Gateway Protocol (BGP), each VPN route prefix needs to carry 8 bytes of RD information. The inventor found through research that an RD has no other purpose and meaning except for distinguishing VPN routes with overlapping addresses, but it needs to occupy a large amount of space in the network layer reachability information subfield and the revocation route subfield. For example, for each VPNv4 routing prefix, an RD occupies at least 2 / 3 of the length, and even for a VPNv6 routing prefix, an RD occupies at least 1 / 3 of the length. This has a great impact on the transmission efficiency of BGP Update messages...

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Abstract

The invention relates to a method and a network device for configuring an RD (route distinguisher). The method comprises the following steps of configuring a route identifier RD including type information and assignment information, wherein the assignment information comprises administrator sub-information and assigned number sub-information; the administrator sub-information comprises the numerical value with a length being more than or equal to 4 bytes; and the assigned number sub-information comprises the numerical value with a length being more than or equal to 4 bytes. The RD configured with the type information and the assignment information can support massive VPN (virtual private network) examples and can support more application sceneries, for example, the network supporting the use of 4 bytes autonomous system (AS) number or the network supporting the use of IPv6 address.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and network equipment for configuring a route identifier RD. Background technique [0002] Border Gateway Protocol (BGP) is an external gateway protocol for communication between different autonomous systems (AS), and is the de facto standard for inter-domain routing on the Internet. Request For Comments). The three versions released earlier are BGP-1 (RFC1105), BGP-2 (RFC1163) and BGP-3 (RFC1267), and the currently used version is BGP-4 (RFC4271). [0003] In the three early releases, the BGP protocol is mainly used to exchange reachable routing information between autonomous systems AS, build propagation paths between AS domains, prevent routing loops, and apply some routing policies at the AS level. The BGP-4 version supports Classless Inter-Domain Routing (CIDR). Through the multi-protocol extension of BGP, BGP is widely used in the control signaling of various v...

Claims

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Application Information

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IPC IPC(8): H04L29/12H04L12/56
CPCH04L12/4633H04L12/4641
Inventor 董杰陈国义
Owner HUAWEI TECH CO LTD
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