Reference Guide
To view interface configurations, use the show config command in CONFIGURATION INTERFACE mode.
To view interface status in the OSPF process, use the show ip ospf interface command in EXEC mode.
The bold lines in the example show the change on the interface. The change is reflected in the OSPF configuration.
Dell(conf-if)#ip ospf cost 45
Dell(conf-if)#show config
!
interface TengigabitEthernet 0/0
ip address 10.1.2.100 255.255.255.0
no shutdown
ip ospf cost 45
Dell(conf-if)#end
Dell#show ip ospf 34 interface
TengigabitEthernet 0/0 is up, line protocol is up
Internet Address 10.1.2.100/24, Area 2.2.2.2
Process ID 34, Router ID 10.1.2.100, Network Type BROADCAST, Cost: 45
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.1.2.100, Interface address 10.1.2.100
Backup Designated Router (ID) 10.1.2.100, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:06
Neighbor Count is 0, Adjacent neighbor count is 0
Dell#
Enabling OSPFv2 Authentication
To enable or change various OSPF authentication parameters, use the following commands.
● Set a clear text authentication scheme on the interface.
CONFIG-INTERFACE mode
ip ospf authentication-key key
Configure a key that is a text string no longer than eight characters.
All neighboring routers must share password to exchange OSPF information.
● Set the authentication change wait time in seconds between 0 and 300 for the interface.
CONFIG-INTERFACE mode
ip ospf auth-change-wait-time seconds
This setting is the amount of time OSPF has available to change its interface authentication type.
During the auth-change-wait-time, OSPF sends out packets with both the new and old authentication schemes.
This transmission stops when the period ends.
The default is 0 seconds.
Configuring Virtual Links
Areas within OSPF must be connected to the backbone area (Area ID 0.0.0.0).
If an OSPF area does not have a direct connection to the backbone, at least one virtual link is required. Configure virtual links on
an ABR connected to the backbone.
● hello-interval — help packet
● retransmit-interval — LSA retransmit interval
● transmit-delay — LSA transmission delay
● dead-interval — dead router detection time
● authentication-key — authentication key
● message-digest-key — MD5 authentication key
To configure virtual links, use the following command.
● Configure the optional parameters of a virtual link.
Open Shortest Path First (OSPFv2 and OSPFv3)
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