H3C Technologies H3C S10500 Series Switches - Manual (Page 76)

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To do… Use the command… Remarks
Configure a label
acceptance control policy
accept-label peer peer-id ip-prefix ip-prefix-name
Optional
Not configured by default
Configure a label
advertisement control
policy
advertise-label ip-prefix ip-prefix-name [ peer
peer-ip-prefix-name ]
Required
Not configured by default
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 is down, and as a result, MPLS forwarding fails. 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 High Availability Configuration Guide.
• An LSP can be bound to only one BFD session.
Follow these steps to configure BFD for MPLS LDP:
To do… Use the command… Remarks
Enter system view system-view —
Enter MPLS LDP remote peer
view mpls ldp remote-peer
remote-peer-name
—
Enable BFD for MPLS LDP remote-ip bfd
Required
Disabled by default
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 “VPLS configuration.”
Resetting LDP sessions
If you change LDP session parameters when some LDP sessions are up, the LDP sessions cannot function
normally. In this case, reset LDP sessions so the LDP peers will renegotiate parameters and establish new
sessions.