C
HAPTER
20
| Unicast Routing
Configuring the Open Shortest Path First Protocol (Version 2)
– 537 –
◆ Transit Area – Common area the virtual link crosses to reach the
target router. This identifier is in the form of an IP address.
◆ Router ID – Virtual neighbor’s router ID.
◆ Status – Indicates if the link is up or down.
◆ Local Address – The IP address of ABR that serves as an endpoint
connecting the isolated area to the common transit area.
◆ Remote Address – The IP address this virtual neighbor is using. The
neighbor must be an ABR at the other endpoint connecting the common
transit area to the backbone itself.
◆ Hello Due – The number of seconds before the next hello message is
due. This time is determined by the Hello Interval which must be the
same for all router attached to a common network.
◆ Adjacency State – The state of the virtual neighbor relationship:
■
Down – Connection down
■
Attempt – Connection down, but attempting contact (non-broadcast
networks)
■
Init – Have received Hello packet, but communications not yet
established
■
Two-way – Bidirectional communications established
■
ExStart – Initializing adjacency between neighbors
■
Exchange – Database descriptions being exchanged
■
Loading – LSA databases being exchanged
■
Full – Neighboring routers now fully adjacent
WEB INTERFACE
To display information about virtual links stored in the link state database:
1. Click Routing Protocol, OSPF, Information.
2. Click Virtual Link.
3. Select the process identifier.
Figure 359: Displaying Virtual Links Stored in the Link State Database
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