Viewing OSPF virtual link information

Syntax:


show ip ospf virtual-link [[area area-id] | [ip-address]]

ip-address: Displays detailed information for a particular virtual neighbor.
area-id: Only virtual neighbors belonging to that area are shown.

Output for the show ip ospf virtual-link command

If virtual links are configured on a routing switch, you can display OSPF virtual link information by entering show ip ospf virtual-link at any CLI level.

switch# show ip ospf virtual-link

OSPF Virtual Interface Status

 Transit AreaID  Neighbor Router Authentication  Interface State
 --------------- --------------- --------------- ---------------
 10.3.16.0       10.0.8.33       none            P2P
 10.3.16.0       10.0.8.36       none            P2P

This display shows the following information.

Table 26: CLI display of OSPF virtual link information
Field	Description
Transit Area ID	Area ID of transit area for the virtual link.
Neighbor Router	Router ID of the virtual neighbor.
Authentication	none or simple (same as for normal interface.)
Interface State	The state of the virtual link to the virtual neighbor. The possible values are: DOWN The routing switch has not yet found a route to the virtual neighbor. P2P (point-to-point) The routing switch has found a route to the virtual neighbor. Virtual links are "virtual" serial links, hence the point-to-point terminology.

Notice from the syntax statement that ip-address can be specified to display detailed information for a particular virtual neighbor. If an area-id is specified, only virtual neighbors belonging to that area are shown.

Example

To get OSPF virtual link information for IP address 10.0.8.33, enter show ip ospf virtual-link 10.0.8.33. A display similar to the following is shown.

Output for the show ip ospf virtual-link ip-addr command

switch# show ip ospf virtual-link 10.0.8.33

OSPF Virtual Interface Status for interface 10.0.8.33
  Transit AreaID : 10.3.16.0
  Neighbor Router : 10.0.8.33

  Authentication  : none                Chain          : 
  Interface State : P2P                 Transit Delay  : 1
  Events          : 1                   Rtr Interval   : 5
  Dead Interval   : 40                  Hello Interval : 10

In this display, these fields show the same type of information as described for the general OSPF virtual link display: Transit Area ID, Neighbor Router, Authentication, and Interface State. This display shows the following additional information:

Table 27: CLI display of OSPF virtual link information—Specific IP address
Field	Description
Events	The number of times the virtual link interface state has changed.
Transit delay	The configured transit delay for the virtual link.
Rtr Interval	The configured retransmit interval for the virtual link.
Hello Interval	The configured hello interval for the virtual link.
Dead Interval	The configured router dead interval for the virtual link.