IP ROUTING

Configuring Virtual Links

All OSPF areas must

 

 

 

 

 

connect to the backbone. If

 

 

 

 

 

an area does not have a

 

 

 

isolated

direct physical connection to

 

 

 

area

 

 

 

 

 

the backbone, you can

 

 

 

 

 

configure a virtual link that

 

 

 

ABR

 

 

 

 

 

 

provides a logical path to the

 

 

virtual

backbone. To connect an

 

 

 

 

link

isolated area to the

backbone

 

 

ABR

 

normal

backbone, the logical path

 

 

 

 

 

 

 

 

 

area

 

 

 

 

 

can cross a single non-backbone area (i.e.,

transit area) to reach the backbone. To define this path, you must configure an ABR that serves as an endpoint connecting the isolated area to the common transit area, and specify a neighboring ABR as the other endpoint connecting the common transit area to the backbone itself. (Note that you cannot configure a virtual link that runs through a stub or NSSA area.)

Virtual links can also be used to create a redundant link between any area and the backbone to help prevent partitioning, or to connect two existing backbone areas into a common backbone.

Command Attributes

Area ID – Identifies the transit area for the virtual link. (The area ID must be in the form of an IP address.)

Neighbor Router ID – Neighbor router at other end of the virtual link. This must be an Area Border Router (ABR) that is adjacent to both the backbone and the transit area for the virtual link.

Events – The number of state changes or error events on this virtual link.

The other items are described under “Configuring OSPF Interfaces,” page 3-297.

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SMC Networks SMC8612XL3 F 1.0.1.3 manual 303, Configuring Virtual Links

SMC8612XL3 F 1.0.1.3 specifications

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