Configuring OSPF

Configuring OSPF

 

 

 

 

Configuring Redundant Switches in a Stack for Graceful Restart

By default, OSPF graceful restart is disabled. To configure OSPF graceful restart support use the ip ospf restart-supportcommand by entering ip ospf restart-supportfollowed by either planned-unplanned(the default) or planned-only.

For example, to modify OSPF graceful restart so that it only supports planned restarts enter:

-> ip ospf restart-support planned-only

To disable support for graceful restart use the no form of the ip ospf restart-supportcommand by enter- ing:

-> no ip ospf restart-support

Continuous forwarding during a graceful restart depends on several factors. If the secondary module has a different router MAC than the primary module, or if one or more ports of a VLAN belonged to the primary module, spanning tree re-convergence might disrupt forwarding state, even though OSPF performs a graceful restart.

Note. Graceful restart is only supported on active ports (i.e., interfaces), which are on the secondary or idle switches in a stack during a takeover. It is not supported on ports on a primary switch in a stack.

Optionally, you can configure graceful restart parameters with the following CLI commands:

ip ospf restart-interval

Configures the grace period for achieving a graceful OSPF restart.

ip ospf restart-helper status

Administratively enables and disables the capability of an OSPF router

 

to operate in helper mode in response to a router performing a graceful

 

restart.

ip ospf restart-helperstrict-lsa-checking-status

ip ospf restart initiate

Administratively enables and disables whether or not a changed Link State Advertisement (LSA) will result in termination of graceful restart by a helping router.

Initiates a planned graceful restart.

For more information about graceful restart commands, see the “OSPF Commands” chapter in the OmniSwitch CLI Reference Guide.

OmniSwitch 6600 Family Advanced Routing Configuration Guide March 2005

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Alcatel Carrier Internetworking Solutions 060187-10 REV D Ip ospf restart-support planned-only, No ip ospf restart-support