Configuring Graceful OSPF Restart

Configure a router to perform graceful OSPF (Open Shortest Path First) restart:
configure ospf restart [none | planned | unplanned | both ]
Since a router can act as a restart helper router to multiple neighbors, you will specify which neighbors to help.
Configure a router to act as a graceful OSPF restart helper:
configure ospf [vlan [all | vlan-name] | area area-identifier | virtual-link router-identifier area-identifier] restart-helper [none | planned | unplanned | both]
The graceful restart period sent out to helper routers can be configured with the following command:
configure ospf restart grace-period seconds
By default, a helper router will terminate graceful restart if received LSAs would affect the restarting router.

This will occur when the restart-helper receives an LSA that will be flooded to the restarting router or when there is a changed LSA on the restarting router's retransmission list when graceful restart is initiated.
Disable this behavior:
disable ospf [vlan [all {vr vrf_name}| vlan-name] | area area-identifier | virtual-link router-identifier area-identifier] restart-helper-lsa-check

Published March 2020prev | next