The Ultimate Guide to OSPF Commands: Configuring and Optimizing Cisco Routers

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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.
show ip ospf neighbor List all the OSPF neighbors and their states.
show ip ospf neighbor detail Displays a detailed list of neighbors.

Command Reference OSPF

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