About Configure ospf
If it detects that there is a change to a LSA that would be flooded to the restarting router, or if there is a changed LSA on the retransmission list of the restarting router when the graceful restart process is initiated. The graceful-restart helper mode is enabled by default. Configuring Graceful Restart Wait Timer for OSPF OSPF routers are expected to set the RS-bit in the EO-TLV attached to a Hello packet when it is not known that all neighbors are listed in the packet, but the restarting routers require to preserve their adjacencies. However, the RS-bit value must not be longer than the RouterDeadInterval seconds. Hence the timers nsf wait command is introduced to set the RS-bit in Hello packets lesser than RouterDeadInterval seconds. The default value of NSF wait timer is 20 seconds. Before you begin To configure Cisco NSF wait time for OSPF, the device must be NSF-aware or NSF-capable. Procedure Step 1 Enter into OSPF router configuration mode. Example: ciscoasa(config)# router ospf Step 2 Enter timers and specify nsf. Example: ciscoasa(config-router)# timers?router mode commands/options: lsa OSPF LSA timers nsf OSPF NSF timer pacing OSPF pacing timers throttle OSPF throttle timersciscoasa(config-router)# timers nsf ? Step 3 Enter the graceful restart wait interval. This value can range between 1 and 65535. Example: ciscoasa(config-router)# timers nsf wait 200 By using the graceful restart wait interval, you can ensure that the wait interval is not longer than the router dead interval. Remove the OSPFv2 Configuration Remove the OSPFv2 configuration. Procedure Remove the entire OSPFv2 configuration that you have enabled. clear configure router ospf pid Example: ciscoasa(config)# clear configure router ospf 1000 After the configuration is cleared, you must reconfigure OSPF using the router ospf command. Remove the OSPFv3 Configuration Remove the OSPFv3 configuration. Procedure Remove the entire OSPFv3 configuration that you have enabled: clear configure ipv6 router ospf process-id Example: ciscoasa(config)# clear configure ipv6 router ospf 1000 After the configuration is cleared, you must reconfigure OSPFv3 using the ipv6 router ospf command. Example for OSPFv2 The following example shows how to enable and configure OSPFv2 with various optional processes: To enable OSPFv2, enter the following commands: ciscoasa(config)# router ospf 2ciscoasa(config-rtr)# network 10.0.0.0 255.0.0.0 area 0 (Optional) To redistribute routes from one OSPFv2 process to another OSPFv2 process, enter the following commands: ciscoasa(config)# route-map 1-to-2 permitciscoasa(config-route-map)# match metric 1ciscoasa(config-route-map)# set metric 5ciscoasa(config-route-map)# set metric-type type-1ciscoasa(config-route-map)# router ospf 2ciscoasa(config-rtr)# redistribute ospf 1 route-map 1-to-2 (Optional) To configure OSPFv2 interface parameters, enter the following commands: ciscoasa(config)# router ospf 2ciscoasa(config-rtr)# network 10.0.0.0 255.0.0.0 area 0ciscoasa(config-rtr)# interface insideciscoasa(config-interface)# ospf cost 20ciscoasa(config-interface)# ospf retransmit-interval 15ciscoasa(config-interface)# ospf transmit-delay 10ciscoasa(config-interface)# ospf priority 20ciscoasa(config-interface)# ospf hello-interval 10ciscoasa(config-interface)# ospf dead-interval 40ciscoasa(config-interface)# ospf authentication-key ciscociscoasa(config-interface)# ospf message-digest-key 1 md5 ciscociscoasa(config-interface)# ospf
Key features of the Configure ospf that are enabled through these drivers include:
- Support - 04-OSPF configuration- H3C
- Configuring OSPF on the routing switch - Aruba
- OSPF Configuration Show Commands - Practical
- Support - 03-OSPF configuration- H3C
- Configuring OSPF For IPv6 – OSPFv3 in Cisco
- How to Configure OSPF Routing Protocol
- Support - 28-OSPF configuration- H3C
Used to identify a specific device within an OSPF database. No two routers in an OSPF system can have the same router-id. If a router-id is not configured manually in the OSPF routing process the router will automatically configure a router-id determined from the highest IP address of an active interface. When configuring a router-id, the neighbors will not be updated automatically until that router has failed or the OSPF process has been cleared and the neighbor relationship has been re-established. Manually Configure OSPF Router-ID This section describes how to manually configure router-id in OSPFv2 process on the ASA. Procedure Step 1 To use a fixed router ID, use the router-id command. router-id ip-address Example: ciscoasa(config-router)# router-id 193.168.3.3 Step 2 To revert to the previous OSPF router ID behavior, use the no router-id command. no router-id ip-address Example: ciscoasa(config-router)# no router-id 193.168.3.3 Router ID Behaviour while Migrating While migrating OSPF configuration from one ASA , say ASA 1 to another ASA, say ASA 2, the following router id selection behaviour is observed: ASA 2 does not use any IP address for OSPF router-id when all interfaces are in shutdown mode. The possibilities for configuring router-id when all interfaces are in "admin down" state or shutdown mode are: If ASA 2 does not have any router-id configured before, you would see this message: %OSPF: Router process 1 is not running, please configure a router-id After the first interface is brought up, ASA 2 will take IP address of this interface as router id. If ASA 2 had router-id configured before and all interfaces were in "admin down" state when "no router-id" command was issued, ASA 2 will use old router id. ASA 2 uses the old router id, even if IP addresses on the interface that is brought up is changed, until "clear ospf process" command is issued. ASA 2 uses new router id, when ASA 2 had router-id configured before and at least one of interfaces were not in "admin down" state or shutdown mode when "no router-id" command was issued. ASA 2 will use new router id from the IP address of the interfaces even when interfaces are in "down/down" state. Configure OSPF Fast Hello Packets This section describes how to configure OSPF Fast Hello Packets. Procedure Step 1 Configure an interface: interface port-channel number Example: ciscoasa(config)# interface port-channel 10 The number argument indicates the port-channel interface number. Step 2 Set the interval during which at least one hello packet must be received, or else the neighbor is considered down: ospf dead-interval minimal hello-multiplier no.of times Example: ciscoasa(config-if)# ospf dead-interval minimal hell0-multiplier 5ciscoasa The no. of times argument indicates the number of hello packets to be sent every second.
