The path for a virtual link is through an area shared by the neighbor ABR (router with a physical backbone connection), and the ABR
requiring a logical connection to the backbone.
Two parameters elds must be dened for all virtual links--transit area ID and neighbor router:
• The transit area ID represents the shared area of the two ABRs and serves as the connection point between the two routers. This
number should match the area ID value.
• The neighbor router eld is the router ID (IP address) of the router that is physically connected to the backbone, when assigned
from the router interface requiring a logical connection. When assigning the parameters from the router with the physical
connection, the router ID is the IP address of the router requiring a logical connection to the backbone.
NOTE
By default, the Brocade device’s router ID is the IP address congured on the lowest numbered loopback interface. If the device
does not have a loopback interface, the default router ID is the lowest numbered IP address congured on the device. When you
establish an area virtual link, you must congure it on both of the routers (both ends of the virtual link).
FIGURE 23 Dening OSPF virtual links within a network
Conguring OSPF
FastIron Ethernet Switch Layer 3 Routing
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