OcNOS-SP : Layer 3 Guide : Open Shortest Path First Command Reference : OSPFv2 Commands : show ip ospf virtual-links
show ip ospf virtual-links
Use this command to display virtual link information.
Command Syntax
show ip ospf (<0-65535>|) virtual-links (brief|)
Parameters
<0-65535>
The ID of the router process for which information will be displayed.
brief
Display summary of OSPF virtual-links.
Command Mode
Privileged Exec mode and Exec mode
Applicability
This command was introduced before OcNOS version 1.3.
Examples
The following is the display of the virtual link information for two routers, one with the virtual link up and one with virtual link down.
ospfd#show ip ospf virtual-links
Virtual Link VLINK0 to router 10.10.0.9 is up
Transit area 0.0.0.1 via interface eth0
Transmit Delay is 1 sec, State Point-To-Point,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:02
Adjacency state Full
Virtual Link VLINK1 to router 10.10.0.123 is down
Transit area 0.0.0.1 via interface *
Transmit Delay is 1 sec, State Down,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in inactive
Adjacency state Down
The following is the display of the virtual link information for two routers, one with the virtual link up and one with virtual link down when flood reduction is enabled
ospfd#show ip ospf virtual-links
Virtual Link VLINK0 to router 10.10.0.9 is up
Transit area 0.0.0.1 via interface eth0
Transmit Delay is 1 sec, State Point-To-Point,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:02
Adjacency state Full
Virtual Link VLINK1 to router 10.10.0.123 is down
Transit area 0.0.0.1 via interface *
Transmit Delay is 1 sec, State Down,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in inactive
Adjacency state Down
 
DoNotAge LSA Allowed
 
If Hello-Suppression is enabled
M1#sh ip os virtual-links
Virtual Link VLINK0 to router 3.3.3.3 is up
Transit area 0.0.0.1 via interface p8p1
Hello suppression enabled
DoNotAge LSA allowed
Local address 15.1.1.1/32
Remote address 15.1.1.2/32
Transmit Delay is 1 sec, State Point-To-Point,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in inactive
No authentication
Adjacency state Full
M1#
Table 1-49 explains the fields for each virtual-links entry.
 
Table 1-49: show ip ospf virtual-links output details
Field
Description
Virtual Link
Virtual link name, the router ID to which it is connected, and the state of the link.
Transit area
Transit area ID, the interface it uses, and its instance ID – an Instance ID should default to 0. It is only necessary to assign a value other than 0 on those links that will contain multiple separate communities of OSPF routers.
Local address
The local IP address and subnet mask.
Remote address
The remote IP address and subnet mask.
Transmit Delay
The delay, in seconds, between link-state transmits. This value must be the same for all nodes on the network. The range is 0 to 65535. The default is 1. The state is point-to-point.
Timer intervals configured
The configured values in seconds of the following timers: Hello, Dead, Wait, Retransmit.
Hello due in
A countdown timer that indicates when the next Hello packet should arrive.
Adjacency State
Whether the adjacency state is either up or down.
Last modified date: 10/16/2023