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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring Intra-AS Seamless MPLS

Configuring Intra-AS Seamless MPLS

In the intra-seamless MPLS networking, the access, aggregation, and core layers are within a single AS. A BGP LSP is established across the three layers within the AS to implement E2E service connectivity.

Usage Scenario

As shown in Figure 5-1, the access, aggregation, and core layers belong to the same AS. Intra-AS seamless MPLS can be configured to transmit services between NodeBs (Ethernet stations) and a mobility management entity (MME) or serving gateway (SGW). Intra-AS seamless MPLS applies to mobile bearer networks.

Figure 5-1  Intra-AS seamless MPLS networking

When intra-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 intra-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 IBGP peer relationships between each Cell Site Gateway (CSG) and Aggregation (AGG), between each AGG and Core ABR, and between each Core ABR 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 5-2  Flowchart for configuring intra-AS Seamless MPLS
Updated: 2018-07-12

Document ID: EDOC1100028530

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