Configuring Ldp Graceful Restart - Alcatel-Lucent OmniSwitch 6850-48 Network Configuration Manual

Configuring MPLS

Configuring LDP Graceful Restart

The LDP graceful restart mechanism is always enabled on the switch. As a result, a fault tolerant (FT)
Session TLV is automatically added to LDP initialization messages to indicate graceful restart is enabled
for the router. The FT Session TLV also includes a default non-zero reconnect time that advertises to LDP
neighbors that the local router retains its forwarding state across restarts.
Even though the graceful restart mechanism is always enabled, it is possible to use the following CLI
commands to configure graceful restart parameters:
configure router ldp graceful-
restart-helper
configure router ldp reconnect-
time
configure router ldp
maximum-recovery-time
configure router ldp fwd-state-
holding-time
configure router ldp neighbor-
liveness-time
For more information about graceful restart commands, see the "Label Distribution Protocol Commands"
chapter in the OmniSwitch CLI Reference Guide.
OmniSwitch AOS Release 6 Network Configuration Guide
Configures the graceful restart helper status for the LDP router. This
signals to other LDP routers whether or not this router is able to help
with the graceful restart process.
Configures the Reconnect Timeout value that a router advertises in the
FT Session TLV of LDP messages. The Reconnect Timeout specifies
the amount of time that neighboring LDP routers should wait for the
sender of the LDP message to gracefully restart and resume sending
LDP messages to the neighbor.
Configures the amount of time the router retains stale MPLS label-for-
warding equivalence class (FEC) bindings received from a neighboring
LDP router as the result of a graceful restart process.
Configures the amount of time that the LDP router retains its MPLS for-
warding state after a restart. During this time, the router is considered in
a restarting state. When the timer expires, the router is considered
restarted.
Configures the amount of time the router will wait for a neighboring
router to re-establish an LDP session. If the neighboring router fails to
establish a session within this amount of time, the local router will
delete the stale label-FEC (Forwarding Equivalence Class) bindings
received from the neighboring router.
September 2009
Configuring MPLS
page 10-29