H3C Technologies H3C S6800 Series Switches - Manual (Page 45)

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available, and the FEC-label mappings based on this session are not deleted. When the direct link
recovers, the LDP peers do not need to re-establish the LDP session or re-learn the FEC-label mappings.
When you enable the session protection function, you can also specify the session protection duration.
If the Link Hello adjacency does not recover within the duration, LDP deletes the Targeted Hello
adjacency and the LDP session. If you do not specify the session protection duration, the two peers will
always maintain the LDP session over the Targeted Hello adjacency.
To configure LDP session protection:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter LDP view. mpls ldp N/A
3. Enable the session protection
function. session protection [ duration time ]
[ peer peer-prefix-list-name ] By default, session protection is
disabled.
Configuring LDP GR
Before you configure LDP GR, enable LDP on the GR restarter and GR helpers.
To configure LDP GR:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter LDP view. mpls ldp N/A
3. Enable LDP GR. graceful-restart By default, LDP GR is disabled.
4. Configure the Reconnect
timer for LDP GR. graceful-restart timer reconnect
reconnect-time By default, the Reconnect time is
120 seconds.
5. Configure the MPLS
Forwarding State Holding
timer for LDP GR.
graceful-restart timer forwarding-hold
hold-time By default, the MPLS Forwarding
State Holding time is 180 seconds.
Configuring LDP NSR
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter LDP view. mpls ldp N/A
3. Enable LDP NSR. non-stop-routing By default, LDP NSR is disabled.
Configuring LDP-IGP synchronization
After you enable LDP-IGP synchronization for an OSPF process, OSPF area, or an IS-IS process, LDP-IGP
synchronization is enabled on the OSPF process interfaces or the IS-IS process interfaces.