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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring an mLDP P2MP Tunnel

Configuring an mLDP P2MP Tunnel

The mLDP P2MP LSP transmits multicast services over an IP/MPLS backbone network, which simplifies network deployment and efficiently uses network bandwidth resources.

Usage Scenario

Conventional core and backbone networks run IP/MPLS to transmit unicast packets and provide high reliability and traffic engineering (TE) capabilities. The proliferation of applications, such as IPTV, video conference, and massively multiplayer online role-playing games (MMORPGs), amplifies demands on multicast transmission over IP/MPLS networks. The existing P2P MPLS technology requires a transmit end to deliver the same data packet to each receive end, which wastes bandwidth resources.

To address this problem, configure an mLDP P2MP LSP. A tree-shaped mLDP P2MP LSP consists of sub-LSPs originating from the root node (ingress) and destined for leaf nodes. The root node directs multicast traffic to the P2MP LSP and sends packets to a branch node for replication. The branch node replicates the packets and forwards them to each leaf node connected to the branch node.

mLDP P2MP tunnels can be manually or automatically established. Table 4-2 compares the manual P2MP tunnels with the automatic P2MP tunnels.
Table 4-2  Comparison between manual and automatic P2MP tunnels


Manual P2MP Tunnel

Automatic P2MP Tunnel

Trigger method

Manually triggered by users

Automatically triggered by services

Usage scenario

Multicast services, excluding multicast VPN, are transmitted.

NG MVPN or multicast VPLS services are transmitted.

Traffic import method

QoS redirection is used to statically direct traffic to LSPs.

Services are automatically directed to LSPs.

Pre-configuration Tasks

Before configuring an mLDP P2MP LSP, complete the following tasks:

Configuration Procedures


mLDP P2MP tunnels can only be established in DU mode.

Updated: 2018-07-12

Document ID: EDOC1100028530

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