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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring Inter-AS Seamless MPLS

Configuring Inter-AS Seamless MPLS

In the inter-AS seamless MPLS networking, the access and aggregation layers belong to one AS, and the core layer belong to another AS. An inter-AS BGP LSP is established across the three layers to implement E2E service connectivity.

Usage Scenario

In Figure 5-3, the access and aggregation layers belong to one AS, and the core layer belongs to another AS. Inter-AS seamless MPLS can be configured to transmit services between NodeBs that are Ethernet stations and an Mobility Management Entity (MME) or Serving Gateway (SGW).

Figure 5-3  Inter-AS seamless MPLS networking

When inter-AS seamless MPLS is configured for an L3VPN, BGP LSPs can be iterated to load-balancing LDP, TE, or LDP over TE tunnels and support ECMP or UCMP.

Pre-configuration Tasks

Before configuring inter-AS seamless MPLS, complete the following tasks:

  • Configure IGP protocols to implement connectivity at the access, aggregation, and core layers and enable MPLS LDP or MPLS TE to implement MPLS forwarding on a public network.

  • Configure an EBGP peer relationship between each pair of an AGG ASBR and core ASBR and an IBGP peer relationship between each pair of the following nodes:
    • Cell Site Gateway (CSG) and Aggregation (AGG)
    • AGG and AGG ASBR
    • Core ASBR and Mobile Aggregate Service Gateway (MASG)

If MPLS TE tunnels are used across the three layers, a tunnel policy or tunnel selector must be configured. For configuration details, see VPN Tunnel Management Configuration.

Configuration Procedures

Figure 5-4  Flowchart for configuring inter-AS Seamless MPLS
Updated: 2018-07-12

Document ID: EDOC1100028530

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