Virtual links can be used to link an area isolated from the backbone, 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. Note that the processes of establishing a active link between virtual neighbors is similar to that used for physically adjacent neighbors..
Parameter | Description |
Area ID | The transit area the virtual link must cross to connect the border routers. |
Router ID | The OSPF identifier for the router at the other end of the link. |
IP Address | IP address of the border router at the other end of the link. |
Option | The optional OSPF capabilities supported by the neighbor. The neighbor's |
| optional OSPF capabilities are also listed in its Hello packets. This enables |
| received Hellos to be rejected (i.e., neighbor relationships will not even start to |
| form) if there is a mismatch in certain crucial OSPF capabilities. The OSPF |
| optional capabilities currently accepted include external routing capability and |
| TOS capability. |
| You need to map the binary bits to the supported options. For example, “3” |
| indicates both routing capability and TOS capability. |
WGS3 Layer 3 Switch User’s Manual | - 225 - |