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Configuring OSPF Configuring OSPF
page 1-32 OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007
Configuring Redundant Switches in a Stack for Graceful Restart
By default, OSPF graceful restart is disabled. To enable OSPF graceful restart support on OmniSwitch
6800 and OmniSwitch 6850 switches, use the ip ospf restart-support command by entering ip ospf
restart-support followed by planned-unplanned.
For example, to enable OSPF graceful restart to support planned and unplanned restarts enter:
-> ip ospf restart-support planned-unplanned
To disable OSPF graceful restart, use the no form of the ip ospf restart-support command by entering:
-> no ip ospf restart-support
On OmniSwitch 6800 and OmniSwitch 6850 switches only, 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-conver-
gence might disrupt the 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:
For more information about graceful restart commands, see the “OSPF Commands” chapter in the
OmniSwitch CLI Reference Guide.
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-helper strict-lsa-
checking status
Administratively enables and disables whether or not a changed Link
State Advertisement (LSA) will result in termination of graceful restart
by a helping router.
ip ospf restart initiate Initiates a planned graceful restart.