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NE20E-S V800R010C10SPC500 Feature Description - VPN 01

This is NE20E-S V800R010C10SPC500 Feature Description - VPN
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Inter-AS VPLS

Inter-AS VPLS

Definition

Inter-AS VPLS refers to the VPLS that crosses more than one AS. Inter-AS VPLS has two implementation modes: Option A and Option C.

NOTE:
If you do not consider the learning or forwarding functions of VSIs and only consider the establishment of PWs between PEs, implementing inter-AS VPLS is similar to implementing other types of L2VPNs.

Purpose

Inter-AS VPLS enables communication between VPLS users in different ASs.

Implementation of Inter-AS VPLS Option A

On the network shown in Figure 10-17, inter-AS VPLS Option A is implemented as follows:

  • An IGP protocol is configured on the MPLS backbone network for devices in the same AS to communicate.

  • MPLS is configured both globally and per interface on each device of the backbone network. A dynamic LSP is established between the PE and ASBR in the same AS.

  • An IBGP peer relationship as well as a VPN LSP are established between the PE and ASBR in the same AS.

  • VSIs are configured on the PE and ASBR in the same AS, and the corresponding AC interfaces are bound to these VSIs. Each ASBR regards its peer ASBR a local CE.

Figure 10-17 Inter-AS VPLS Option A networking

Implementation of Inter-AS VPLS Option C

On the network shown in Figure 10-18, inter-AS VPLS Option C is implemented as follows:

  • An IGP protocol is configured on the MPLS backbone network for devices in the same AS to communicate.

  • MPLS is configured both globally and per interface on each device of the backbone network. A dynamic LSP is established between the PE and ASBR in the same AS.

  • An IBGP peer relationship is established between the PE and ASBR in the same AS, and an EBGP peer relationship is established between ASBRs.

  • A routing policy is configured and label-based routing is enabled on each ASBR.

  • An MP-EBGP peer relationship is established between PE1 and PE2.

  • VSIs are configured on PE1 and PE2, and the corresponding AC interfaces are bound to these VSIs.

Figure 10-18 Inter-AS VPLS Option C networking

Inter-AS VPLS Usage Scenarios

  • In Option A, configurations are easy. There is no need to run MPLS between ASBRs or perform particular configurations for inter-AS communications. The disadvantage of this mode is that it has poor expansibility and imposes high requirements for PEs. This mode is best suited for the early servicing stage when the number of inter-AS VPNs is small.

  • In Option C, ASBRs are only responsible for forwarding packets, and the intermediate devices need to support only MPLS forwarding. This mode prevents ASBRs from becoming performance bottlenecks. The disadvantage of this mode is that it costs too much to manage an end-to-end connection between PEs. This mode is best suited for the peak servicing stage when the number of inter-AS VPNs is large.

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Updated: 2019-01-03

Document ID: EDOC1100055135

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