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Distribution method for boundary routers of autonomous system and boundary router

An autonomous system and router technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of insufficiency of the system, waste of memory resources, occupation of labels, etc., to save memory resources, save label resources, and reduce the burden. Effect

Active Publication Date: 2009-10-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in practical applications, ASBR often needs to store and publish a large number of VPN-IPv4 routes inside and outside the domain, which requires a large number of labels and creates a large number of ILM
Since the label resources are limited, and the storage and processing capabilities of the system for ILM are also limited, the existing method of publishing routes in cross-domain B is likely to cause waste of label resources; in addition, it is easy to create a large number of ILMs on ASBR This creates a burden on the forwarding level, and these ILMs must be broadcast to each interface board. The forwarding information needs to be refreshed continuously between the main control board and the interface board, which is likely to cause waste of memory resources. Such a label allocation method may cause the system to fail to meet the requirements. The requirements of certain application environments

Method used

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  • Distribution method for boundary routers of autonomous system and boundary router
  • Distribution method for boundary routers of autonomous system and boundary router
  • Distribution method for boundary routers of autonomous system and boundary router

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: The ASBR receives routes of multiple VPNs from one PE

[0057] see Figure 6 As shown, ASBR1 is only connected to PE1, and two VPN-instances are configured on PE1: VPN1 and VPN2, both of which adopt the per-instance label distribution mode.

[0058] The RD of VPN1 is 100:1. Assume that there are three routes: 10.1.0.0 / 16, 10.2.0.0 / 16, 10.3.0.0 / 16. Since the per-instance label distribution method is used, these routes are in VPN-IPv4 When the routes are advertised to ASBR1, they all use the same label Lm.

[0059] The RD of VPN2 is 100:2. It is also assumed that there are three routes: 10.1.0.0 / 16, 10.2.0.0 / 16, and 10.3.0.0 / 16. Here, it is assumed that VPN1 and VPN2 have overlapping addresses. Of course, the addresses of VPN1 and VPN2 can also be used. different. Similarly, because of the per-instance label allocation method, these routes all use the same label Ln when they are advertised to ASBR1 in the form of VPN-IPv4 routes.

[0060] Among them, Lm ...

Embodiment 2

[0068] Embodiment 2: The ASBR receives routes of multiple VPNs from multiple PEs

[0069] see Figure 7 As shown in the figure, ASBR1 is connected to PE1 and PE3 respectively, and two VPN-instances are configured on PE1 and PE3 respectively: VPN1 and VPN2, both of which adopt the per-instance label distribution mode.

[0070] The RD of VPN1 on PE1 is 100:1. Assume that there are three routes: 10.1.0.0 / 16, 10.2.0.0 / 16, and 10.3.0.0 / 16. Since the per-instance label distribution method is adopted, these routes are distributed in the VPN - When the form of IPv4 route is advertised to ASBR1, the same label Lm is used. The RD of VPN2 is 100:2. It is also assumed that there are three routes: 10.1.0.0 / 16, 10.2.0.0 / 16, and 10.3.0.0 / 16. When these routes are advertised to ASBR1 in the form of VPN-IPv4 routes, they all use the same The label Ln. It is still assumed here that the addresses of VPN1 and VPN2 overlap, of course, the addresses of VPN1 and VPN2 may also be different.

[00...

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PUM

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Abstract

The invention discloses a route distribution method of autonomous system boundary router. When the autonomous system boundary router ASBR distributes route, distribute the same in-label to the routes received with the same next-leap and out-label and release the routes. The invention also discloses an autonomous system boundary router, which mainly includes an input unit, a label distribution unit and an output unit. The method and the system provided by the invention can save label resources, and can avoid large amount of labels creation exchanging mapping ILM, in order to save memory resources.

Description

technical field [0001] The invention relates to routing technology, in particular to a method for issuing routes on an autonomous system border router (ASBR) and an autonomous system border router. Background technique [0002] Border Gateway Protocol (BGP, Border Gateway Protocol) Multi-Protocol Label Switching (MPLS, Multiple Protocol Label Switch) Internet Protocol (IP) Virtual Private Network (VPN, VirtulPrivate Network), that is, BGP MPLS IP VPN is a service provider edge router based (PE, Provider Edge) Layer 3 VPN (L3VPN) technology, it uses BGP to publish VPN routes on the service provider backbone network, and uses MPLS to forward VPN packets on the service provider backbone network, with flexible networking and good scalability , and the application is becoming more and more extensive. see figure 1 The schematic diagram of the BGP MPLS IP VPN model shown mainly includes three parts: customer network edge equipment (CE, CustomerEdge), PE, and service provider netw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L12/66H04L29/06
CPCH04L45/507H04L45/00
Inventor 李勇
Owner HUAWEI TECH CO LTD
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