Maintaining Ldp Sessions; Configuring Bfd For Mpls Ldp; Resetting Ldp Sessions - H3C SR8800 10G Mpls Configuration Manual

Step
3. Configure a label acceptance
control policy.
4. Configure a label
advertisement control policy.
NOTE:
For two neighboring LSRs, configuring a label acceptance control policy on the upstream LSR and
configuring a label advertisement control policy on the downstream LSR can achieve the same effect. To
reduce the network load, H3C recommends configuring only label advertisement control policies.

Maintaining LDP sessions

This section describes how to detect communication failures between remote LDP peers and reset LDP
sessions.

Configuring BFD for MPLS LDP

MPLS itself cannot detect a neighbor failure or link failure in time. If communication between two remote
LDP peers fails, the LDP session will be down, and as a result, MPLS forwarding will fail. By cooperating
with bidirectional forwarding detection (BFD), MPLS LDP can be quickly aware of communication failures
between remote LDP peers, improving performances of existing MPLS networks.
NOTE:
For more information about BFD, see
•
An LSP can be bound to only one BFD session.
•
To configure BFD for MPLS LDP:
Step
1. Enter system view.
2. Enter MPLS LDP remote peer
view.
3. Enable BFD for MPLS LDP.
NOTE:
The cooperation of MPLS LDP and BFD can be used to detect communication failures between remote LDP
peers only. For related configuration examples, see the chapter "Configuring VPLS."

Resetting LDP sessions

If you change LDP session parameters when some LDP sessions are up, the LDP sessions will not be able
to function normally. In this case, you need to reset the LDP session so that the LDP peers renegotiate
parameters and establish new sessions.
Command
accept-label peer peer-id ip-prefix
ip-prefix-name
advertise-label ip-prefix
ip-prefix-name [ peer
peer-ip-prefix-name ]
High Availability Configuration Guide
Command
system-view
mpls ldp remote-peer
remote-peer-name
remote-ip bfd
20
Remarks
Optional.
Not configured by default.
Not configured by default.
.
Remarks
N/A
N/A
Disabled by default