3Com MSR 50 Series Configuration Manual page 965

RouterA becomes the DR, Router C the BDR.
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The full neighbor state means Router D has established the adjacency with the
router. The 2-way neighbor state means the two routers are neither the DR nor
the BDR, and they do not exchange LSAs.
# Display interface information
[RouterA] display ospf interface
[RouterB] display ospf interface
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The interface state DROther means the interface is not the DR/BDR.
Configuring OSPF Network requirements
Virtual links
In
1 acts as the Transit Area to connect Area 2 to Area 0 via a virtual link between
RouterA and RouterB.
After configuration, RouterA can learn routes to Area 2.
Network diagram
Figure 293 Network diagram for OSPF virtual link configuration
Configuration procedure
1 Configure IP addresses for interfaces (omitted)
2 Configure OSPF basic functions
# Configure RouterA
Neighbor is up for 00:01:41
Authentication Sequence: [ 0 ]
OSPF Process 1 with Router ID 1.1.1.1
Interfaces
Area: 0.0.0.0
IP Address type
192.168.1.1 Broadcast DR
OSPF Process 1 with Router ID 2.2.2.2
Interfaces
Area: 0.0.0.0
IP Address type
192.168.1.2 Broadcast DROther
Figure 293, Area 2 has no direct connection to Area 0, the backbone, and Area
Area 1
Router A
S2/0
192 .168 .1 .2/24
192.168 .1.1/24
Virtual Link
Eth1/0
10 .1.1.1/8
Area 0
OSPF Configuration Examples
State Cost Pri DR
1 100 192.168.1.1
State Cost Pri DR
1 0 192.168.1.1
Router B
S2 /0
Eth1/0
172.16.1.1/16
Area 2
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BDR
192.168.1.3
BDR
192.168.1.3