Configuring Inter-AS PWE3
Context
The devices support inter-AS PWE3 Option A. Option A is easy to implement; however, each ASBR must provide a dedicated interface for each inter-AS VC. The interface can be a sub-interface, physical interface, or logical interface. If the number of inter-AS VCs is small, this solution can be used.
Pre-configuration Tasks
Before configuring inter-AS PWE3, complete the following tasks:
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Configure an IGP protocol for the MPLS backbone network in each AS to ensure IP connectivity of the backbone network within an AS.
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Configure basic MPLS functions on the MPLS backbone network in each AS.
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Configure MPLS LDP and establish the LDP LSP for the MPLS backbone in each AS.
Procedure
The configurations of inter-AS PWE3 Option A are as follows:
- Perform the operation of Configuring a Dynamic PW in each AS.
- Configure the ASBRs. Each ASBR considers the peer ASBR as its CE.
You do not need to perform any additional configuration for inter-AS implementation on ASBRs and do not need to configure IP addresses for the directly connected interfaces between ASBRs.
The configuration details are not mentioned here.