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LSP establishing method

A technology of establishing method and forwarding method, applied in the establishment of inter-domain LSP and virtual private network field, can solve the problems of complicated configuration, increase processing difficulty, etc., reduce network restrictions, facilitate network control and management, and reduce labels The effect of the number of distributions

Active Publication Date: 2007-05-23
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0013] There are two disadvantages of this solution: first, since all devices along the route must learn the routes on PE1, the routes outside the domain must be imported to all devices in the domain; second, the solution needs to be implemented on the ASBR Configure complex LSP policies, which need to specify filtering rules, which are still configured according to the IP address of PE1, rather than automatically controlling label distribution, and the configuration is cumbersome and complicated, which increases the difficulty of processing

Method used

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Embodiment Construction

[0040] The specific embodiments of the present invention are explained below with reference to the accompanying drawings.

[0041] As shown in Figure 4, PE1 and PE2 are provider edge devices (Provider Edge, PE) belonging to two different domains AS#1 and AS#2, and the VPN routes on them have been published through MULTIHOP-EBGP , for example, PE2 receives a VPN route on PE1, its next hop is 10.0.0.1, and now it needs to establish an LSP with destination address 10.0.0.1 on PE2, therefore, AS#2 is the upstream domain in this specific embodiment , AS#1 is the downstream domain in this specific embodiment, PE2 is the source device in this specific embodiment, PE1 is the destination device in this specific embodiment, and this specific embodiment describes the connection between the source device and The destination device establishes a cross-domain LSP, thus illustrating the complete technical solution of the method for establishing an LSP in the present invention.

[0042] In o...

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Abstract

The invention relates to a method for building LSP, wherein said method comprises that: building domain LSP pointed from ascending device to the target address; using inter-domain LDP to build inter-domain LSP when starting the inter-domain LDP; then connecting the domain LSP and inter-domain LSP to form integral LSP. The invention can use LDP protocol to build LSP on span PE device, and realize automatic distribution of mark, to reduce the mark distribution number. And the mark distribution is independent from route protocol learning, to reduce load. And the invention can avoid all devices to build external route information.

Description

technical field [0001] The invention belongs to the field of computer networks, and relates to a method for establishing an LSP (Label Switch Path, Label Switching Tunnel), in particular to a method for establishing an inter-domain LSP. ) technology virtual private network (VPN, Virtual Private Network). Background technique [0002] With the gradual expansion of enterprise scale, the number of remote users, remote office workers, branches, and partners is also increasing, and the demand for key services increases. A technology to establish a private network through a public network (such as the Internet) has emerged. The technology is Virtual Private Network (Virtual Private Network). VPN integrates flexibility, security, economy and scalability, and can fully meet the needs of branch offices and mobile office security communications. In North America and Europe, VPN has become a fairly popular online business. Currently domestic VPN applications are mainly concentrated ...

Claims

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Application Information

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IPC IPC(8): H04L12/46H04L29/06H04L12/56H04L45/50
Inventor 王锋
Owner NEW H3C TECH CO LTD
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