Cisco Nexus 3548

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Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference
OL-27852-01
Chapter Unicast Routing Commands
area virtual-link (OSPF)
area virtual-link (OSPF)
To define an Open Shortest Path First (OSPF) virtual link, use the area virtual-link command. To
remove a virtual link, use the no form of this command.
area area-id virtual-link router-id
no area area-id virtual-link router-id
Syntax Description
Command Default None
Command Modes Router configuration mode
Command History
Usage Guidelines Use the area virtual-link command to establish a virtual link from a remote area to the backbone area.
In OSPF, all areas must be connected to a backbone area. If the connection to the backbone is lost, it can
be repaired by establishing a virtual link.
Use the area virtual-link command to enter the virtual link configuration mode where you can use the
following commands:
• authentication [key-chain | message-digest | null]
• authentication-key [0 | 3] key
• dead-interval seconds
• hello-interval seconds
• message-digest-key key-id md5 key
• retransmit-interval seconds
• transmit-delay seconds
See each command for syntax and usage details.
You must configure both sides of a virtual link with the same area ID and the corresponding virtual link
neighbor router ID. To see the router ID, use the show ip ospf neighbors command in any mode.
Note You cannot configure a virtual link on a not-so-stubby (NSSA) area.
area-id Identifier for the OSPF area assigned to the transit area for the virtual
link. The area ID can be from 0 to 4294967295 or an IP address.
router-id Router ID associated with the virtual link neighbor. Specify as an IP
address. The router ID appears in the show ip ospf neighbors
display.
Release Modification
5.0(3)A1(1) This command was introduced.