Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 594
Creating Filter Routes, Open Shortest Path First OSPFv2 and OSPFv3
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graceful-restart helper-reject router-id • Planned-only - the OSPFv2 router supports graceful-restart for planned restarts only. A planned restart is when you manually enter a fail-over command to force the primary RPM over to the secondary RPM. During a planned restart, OSPF sends out a Grace LSA before the system switches over to the secondary RPM. OSPF also is notified that a planned restart is happening. • Unplanned-only - the OSPFv2 router supports graceful-restart for only unplanned restarts. During an unplanned restart, OSPF sends out a Grace LSA after the secondary RPM comes online. By default, OSPFv2 supports both planned and unplanned restarts. Selecting one or the other mode restricts OSPFv2 to the single selected mode. 3 Configure the graceful restart role or roles that this OSPFv2 router performs. CONFIG-ROUTEROSPF- id mode graceful-restart role [helper-only | restart-only] Dell Networking OS supports the following options: • Helper-only: the OSPFv2 router supports graceful-restart only as a helper router. • Restart-only: the OSPFv2 router supports graceful-restart only during unplanned restarts. By default, OSPFv2 supports both restarting and helper roles. Selecting one or the other role restricts OSPFv2 to the single selected role. To disable OSPFv2 graceful-restart after you have enabled it, use the no graceful-restart grace-period command in CONFIGROUTEROSPF- id mode. The command returns OSPF graceful-restart to its default state. NOTE: The Helper mode is enabled by default on the device. To enable the restart mode also on the device, you must configure the grace period using the graceful-restart grace-period command. After you enable restart mode the router advertises the neighbor as fully adjacent during a restart. For more information about OSPF graceful restart, refer to the Dell Networking OS Command Line Reference Guide. Example of the show run ospf Command When you configure a graceful restart on an OSPFv2 router, the show run ospf command displays information similar to the following. Dell#show run ospf ! router ospf 1 graceful-restart grace-period 300 graceful-restart role helper-only graceful-restart mode unplanned-only graceful-restart helper-reject 10.1.1.1 graceful-restart helper-reject 20.1.1.1 network 10.0.2.0/24 area 0 Dell# Creating Filter Routes To filter routes, use prefix lists. OSPF applies prefix lists to incoming or outgoing routes. Incoming routes must meet the conditions of the prefix lists. If they do not, OSPF does not add the route to the routing table. Configure the prefix list in CONFIGURATION PREFIX LIST mode prior to assigning it to the OSPF process. • Create a prefix list and assign it a unique name. CONFIGURATION mode ip prefix-list prefix-name You are in PREFIX LIST mode. • Create a prefix list with a sequence number and a deny or permit action. CONFIG- PREFIX LIST mode seq sequence-number {deny |permit} ip-prefix [ge min-prefix-length] [le max-prefix-length] 594 Open Shortest Path First (OSPFv2 and OSPFv3)
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