Filter
Top Products
Command Line Interface
4-276
4
Default Setting
area-id: None
router-id: None
hello-interval: 10 seconds
retransmit-interval: 5 seconds
transmit-delay: 1 second
dead-interval: 40 seconds
authentication-key: None
message-digest-key: None
Command Usage
• All areas must be connected to a backbone area (0.0.0.0) to maintain routing
connectivity throughout the autonomous system. If it not possible to physically
connect an area to the backbone, you can use a virtual link. A virtual link can
provide a logical path to the backbone for an isolated area. You can specify
up to 32 virtual links on this router.
• Any area disconnected from the backbone must include the transit area ID
and the router ID for a virtual link neighbor that is adjacent to the backbone.
• This router supports up 64 virtual links.
Example
This example creates a virtual link using the defaults for all optional parameters.
This example creates a virtual link using MD5 authentication.
Related Commands
show ip ospf virtual-links (4-294)
ip ospf authentication
This command specifies the authentication type used for an interface. Enter this
command without any optional parameters to specify plain text (or simple password)
authentication. Use the no form to restore the default of no authentication.
Syntax
ip ospf authentication [message-digest | null]
no ip ospf authentication
• message-digest - Specifies message-digest (MD5) authentication.
• null - Indicates that no authentication is used.
Console(config-router)#network 10.4.0.0 0.255.255.0.0 area 10.4.0.0
Console(config-router)#area 10.4.0.0 virtual-link 10.4.3.254
Console(config-router)#
Console(config-router)#network 10.4.0.0 0.255.255.0.0 area 10.4.0.0
Console(config-router)#area 10.4.0.0 virtual-link 10.4.3.254
message-digest-key 5 md5 ld83jdpq
Console(config-router)#