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To configure and monitor OSPF (Open Shortest Path First) on a Cisco router, you can use various commands. These commands allow you to enable OSPF, modify OSPF settings for interfaces, view OSPF information, and more. Below is a list of commonly used OSPF commands along with their details:
Command
Details
router ospf 123
Turns on OSPF process number 123. The process ID is any value between 1 and 65,535. The process ID does not equal the OSPF area.
network 172.16.10.0 0.0.0.255 area 0
OSPF advertises interfaces, not networks. Uses the wildcard mask to determine which interfaces to advertise. The command shown reads: Any interface with an address of 172.16.10.x is to be put into Area 0.
ip ospf priority 50
Changes the OSPF priority for an interface to 50.
bandwidth 128
Changes the bandwidth of an interface to 128 kbps.
ip ospf cost 1564
Changes the cost to a value of 1564.
ip ospf hello-interval 20
Changes the Hello interval timer to 20 seconds.
ip ospf dead-interval 80
Changes the Dead interval timer to 80 seconds.
ip route 0.0.0.0 0.0.0.0 s0/0/0
Creates a static default route pointing out the Serial 0/0/0 interface. This route will have an administrative distance of 0.
default-information originate
Sets the default route to be propagated to all OSPF routers.
show ip protocol
Displays parameters for all routing protocols running on the router.
show ip route
Displays the complete IP routing table.
show ip ospf
Displays basic OSPF information for all OSPF processes running on the router.
show ip ospf interface
Displays OSPF information as it relates to all interfaces.
