Note
The following commands only take effect on newly created sessions. For existing sessions, it is required that the sessions be restarted for the new configuration to take effect.device# configure terminal
device(config)# router mpls
device(config-router-mpls)# ldp
device(config-router-mpls-ldp)# graceful-restart
device(config-router-mpls-ldp-gr)# helper-only
device(config-router-mpls-ldp-gr)# graceful-restart reconnect-time 150
device(config-router-mpls-ldp-gr)# graceful-restart recovery-time 240
device(config-router-mpls-ldp-gr)# graceful-restart max-neighbor-reconnect-time 150
device(config-router-mpls-ldp-gr)# graceful-restart max-neighbor-recovery-time 240
device# show mpls ldp Label Distribution Protocol version 1 LSR ID: 10.210.210.21, using Loopback 1 (deleting it stops LDP) Hello interval: Link 5 sec, Targeted 15 sec Hold time value sent in Hellos: Link 15 sec, Targeted 45 sec Keepalive interval: 6 sec, Hold time multiple: 6 intervals Load sharing: 8 Tunnel metric: 0 FEC used for auto discovered peers: current 129, configured 129 Graceful restart: enabled Reconnect time: 150 seconds, Max peer reconnnect time: 150 seconds Recovery time: 240 seconds, Max peer recovery time: 240 seconds Forwarding state holding timer: not running
The following example shows the previous steps to configure LDP GR.
device# configure terminal device(config)# router mpls device(config-router-mpls)# ldp device(config-router-mpls-ldp)# graceful-restart device(config-router-mpls-ldp-gr)# graceful-restart reconnect-time 150 device(config-router-mpls-ldp-gr)# graceful-restart recovery-time 240 device(config-router-mpls-ldp-gr)# graceful-restart max-neighbor-reconnect-time 150 device(config-router-mpls-ldp-gr)# graceful-restart max-neighbor-recovery-time 240 device(config-router-mpls-ldp-gr)# helper-only
The "helper-only" configuration is mutually exclusive with the recovery and reconnect time configuration. If any of these two timers are configured to non-default value, the helper-only configuration cannot be applied.
device(config-router-mpls-ldp-gr)# helper-only %Error: Unconfigure LDP GR timers before configuring GR Helper mode device(config-router-mpls-ldp-gr)# no recovery-time Possible completions: <cr> device(config-router-mpls-ldp-gr)# no recovery-time device(config-router-mpls-ldp-gr)# helper-only device(config-router-mpls-ldp-gr)# device(config-router-mpls-ldp-gr)# helper-only device(config-router-mpls-ldp-gr)# device(config-router-mpls-ldp-gr)# device(config-router-mpls-ldp-gr)# recovery-time 150 %Error: Unconfigure LDP GR Helper mode before configuring GR timers device(config-router-mpls-ldp-gr)# no helper-only device(config-router-mpls-ldp-gr)# recovery-time 150 device(config-router-mpls-ldp-gr)#