Cisco CRS Configuration Guide

PurposeCommand or Action
(Optional)
Resets LDP session for all VRFs.
clear mpls ldp vrf all neighbor
Example:
RP/0/RP0/CPU0:router# clear mpls ldp vrf
all neighbor
Step 15
(Optional)
Resets LDP session for the specified VRF.
clear mpls ldp vrf vrf-name neighbor
Example:
RP/0/RP0/CPU0:router# clear mpls ldp vrf
red neighbor
Step 16
Related Topics
Configuring LDP Neighbors: Example, on page 81
Setting Up LDP Forwarding
Perform this task to set up LDP forwarding.
By default, the LDP control plane implements the penultimate hop popping (PHOP) mechanism. The PHOP
mechanism requires that label switched routers use the implicit-null label as a local label for the given
Forwarding Equivalence Class (FEC) for which LSR is the penultimate hop. Although PHOP has certain
advantages, it may be required to extend LSP up to the ultimate hop under certain circumstances (for example,
to propagate MPL QoS). This is done using a special local label (explicit-null) advertised to the peers after
which the peers use this label when forwarding traffic toward the ultimate hop (egress LSR).
Before You Begin
Stable router ID is required at either end of the link to ensure the link discovery (and session setup) is successful.
If you do not assign a router ID to the routers, the system will default to the global router ID. Default router
IDs are subject to change and may cause an unstable discovery.
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
39
Implementing MPLS Label Distribution Protocol
Setting Up LDP Forwarding

Cisco CRS Specifications

General

Brand	Cisco
Model	CRS
Category	Network Router
Language	English