Configuring Graceful Restart Helper Parameters - Nokia 7705 SAR-W Series Manual

MPLS Guide

5.10.2 Configuring Graceful Restart Helper Parameters

Graceful Restart Helper advertises to its LDP neighbors by carrying the fault tolerant
(FT) session TLV in the LDP initialization message, assisting the LDP in preserving
its IP forwarding state across the restart. The 7705 SAR recovery is self-contained
and relies on information stored internally to self-heal.
Maximum recovery time is the time (in seconds) that the sender of the TLV would like
the receiver to wait, after detecting the failure of LDP communication with the sender.
Neighbor liveness time is the time (in seconds) that the LSR is willing to retain its
MPLS forwarding state. The time should be long enough to allow the neighboring
LSRs to resynchronize all the LSPs in a graceful manner, without creating
congestion in the LDP control plane.
Use the following syntax to configure graceful restart parameters:
CLI Syntax:
Example:
The following example displays the import policy configuration output.
ALU-1>config>router>ldp>graceful-restart# info
----------------------------------------------
----------------------------------------------
ALU-1>config>router>ldp>graceful-restart#
3HE 18686 AAAB TQZZA
config>router>ldp
[no] graceful-restart
[no] maximum-recovery-time interval
[no] neighbor-liveness-time interval
config>router>ldp
config>router>ldp# graceful-restart
config>router>ldp>graceful-restart# maximum-recovery-
time 120
config>router>ldp>graceful-restart# neighbor-liveness-
time 60
config>router>ldp# exit
config>router#
maximum-recovery-time 120
neighbor-liveness-time 60
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