Establishing Ldp Lsps; Optional) Configuring Php - Huawei AR1200 Series Configuration Manual - Mpls

Huawei AR1200 Series Enterprise Routers
Configuration Guide - MPLS
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Pre-configuration Tasks
Before configuring LDP LSPs, complete the following task:
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Data Preparation
To configure LDP LSPs, you need the following data.
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2.5.2 Establishing LDP LSPs

An LDP LSP is automatically established after an LDP session is established.
Prerequisite
The task described in
Context
An MPLS LDP session is configured between each pair of adjacent LSRs along an LSP to be
established. After MPLS LDP sessions are established, LDP LSPs are automatically established.

2.5.3 (Optional) Configuring PHP

Penultimate hop popping (PHP) can be configured on the egress to allocate a label to an LSR at
the penultimate hop, helping relieve the burden on the egress.
Context
No label needs to be swapped on the egress of an LSP. PHP can be configured on the egress to
allow the LSR at the penultimate hop to pop out the label from an MPLS packet and send the
packet to the egress. After receiving the packet, the egress directly forwards the unlabeled IP
packet or the single-labeled packet. PHP helps reduce the burden on the egress.
Issue 01 (2011-12-30)
VPN Configuration" in the Huawei AR1200 Series Enterprise Routers Configuration
Guide - VPN.
– Host routes trigger LSP establishment.
– Routes matching an IP prefix list triggers LSP establishment.
– No route triggers LSP establishment.
Transit LSPs can be established based on an IP prefix list. The IP prefix list is used to filter
out unqualified routes and allow LDP to use only eligible routes to establish LSPs.
2.3 Configuring a Local LDP Session
Data
LSR ID of each LSR
2.3 Configuring a Local LDP Session
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2 MPLS LDP Configuration
is complete.
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