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When using OSPF, routing switches, which are ABRs, need to be connected directly to the backbone. If they are not directly connected, they need to have a virtual link.
In the Passport routing switches, you can set the following configurations:
When automatic virtual linking is enabled, it acts as insurance. A virtual link is created for vital traffic paths in your OSPF configuration if something goes amiss, such as when an interface cable providing connection to the backbone (either directly or indirectly) becomes disconnected from the switch.
Specifying automatic virtual linking ensures that a link is created via another routing switch. When you specify automatic virtual linking, it is always ready to create a virtual link. If automatic virtual linking uses more resources than you want to expend, creating a manual virtual link may be the better solution. This approach lets you conserve resources while having specific control of where virtual links are placed in your OSPF configuration.
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