Ericsson ECN330 - Page 460

Configuring the ECN330-switch
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area, and a neighboring ABR specified as the other endpoint connecting the
common transit area to the backbone itself. (Note that a virtual link cannot be
configured that runs through a stub or NSSA area.)
)
Figure 204 OSPF Virtual Link
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 449.
Note: This router supports up 64 virtual links.
backbone
normal
area
isolated
area
ABR
ABR
virtual
link