Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 389)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 365
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MPLS LDP-IGP synchronization
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The helper-only option specifies that the LSR acts as a helper-only. In helper mode, the
configuration commands for reconnect-time and recovery-time is rejected with informational
messages. The [no] form of the commands removes the LDP GR helper mode and revert back to
full LDP GR mode.
The reconnect-time seconds option is the amount of time a GR neighbor must wait for the LDP
session to be reestablished. This is advertised to the neighbor using the FT Reconnect Timeout
field in the FT Session TLV. The default setting is 120 seconds. The available range is 60 to 300
seconds. The [no] form of the command reverts the configured value back to the default value.
The max-neighbor-reconnect-time seconds option is the maximum time this router must wait for a
GR neighbor to restore the LDP session. The default setting is 120 seconds. The available range is
60 to 300 seconds. The [no] form of the command reverts the configured value back to the default
value.
The recovery-time seconds option is the amount of time this router retains its MPLS forwarding
state across restart. This is advertised to the neighbor using the Recovery Time field in the FT
Session TLV. The default setting is 120 seconds. The available range is 60 to 3600 seconds. The
no form of the command reverts the configured value back to the default value.
The max-neighbor-recovery-time seconds option is the maximum amount of time this router waits
for a GR neighbor to complete its GR recovery after the LDP session has been reestablished. The
default setting is 120 seconds. The available range is 60 to 3600 seconds. The no form of the
command reverts the configured value back to the default value.
Recovery-time must be chosen accordingly taking into account the time it takes for RTM to
re-compute the routes and the number of L3 FECs that need to be recovered as part of the LDP GR
recovery. This is applicable to GR processing on ingress as well as transit LSRs.
NOTE
The reconnect-time and recovery-time commands are not available for Brocade NetIron CES and
Brocade NetIron CER routers.
LDP GR configuration examples
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.
Using default timeout values
Use the graceful-restart command to enable LDP GR and use the default timeout values:
Brocade(config-mpls-ldp)# graceful-restart
Configuring LDP GR timers
Use the following commands to set LDP GR timers before enabling LDP GR.
Brocade(config-mpls-ldp)# graceful-restart reconnect-time 150
Brocade(config-mpls-ldp)# graceful-restart recovery-time 240
Brocade(config-mpls-ldp)# graceful-restart
Configuring LDP GR helper mode
Use the graceful-restart helper-only command to configure LDP GR helper mode.
Brocade(config-mpls-ldp)# graceful-restart helper-only