Reference Guide
710 | Open Shortest Path First (OSPFv2)
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Figure 33-16. Changing the OSPF Cost Value on an Interface
Enable OSPFv2 authentication
Use the following commands in CONFIGURATION INTERFACE mode to enable or change various
OSPF authentication parameters:
Configure 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. Virtual links must be
configured on an ABR connected to the backbone.
• hello-interval: help packet
• retransmit-interval: LSA retransmit interval
Command Syntax Command Mode Usage
ip ospf authentication-key key CONFIG-INTERFACE Set clear text authentication scheme on the
interface. Configure a key that is a text string no
longer than eight characters.
All neighboring routers must share the same
password to exchange OSPF information.
ip ospf auth-change-wait-time
seconds
CONFIG-INTERFACE Set the authentication change wait time in
seconds between 0 and 300 for the interface.
This 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.
FTOS(conf-if)#ip ospf cost 45
FTOS(conf-if)#show config
!
interface GigabitEthernet 0/0
ip address 10.1.2.100 255.255.255.0
no shutdown
ip ospf cost 45
FTOS(conf-if)#end
FTOS#show ip ospf 34 interface
GigabitEthernet 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
FTOS#
The change is made on the
interface and it is reflected in the
OSPF configuration