3Com Switch 8800 Advanced Software V5 Configuration Guide

348 CHAPTER 30: OSPF CONFIGURATION
Authentication Sequence: [ 0 ]
Router ID: 2.2.2.2 Address: 192.168.1.2 GR State: Normal
State: 2-Way Mode: None Priority: 0
DR: 192.168.1.1 BDR: 192.168.1.3 MTU: 0
Dead timer due in 35 sec
Neighbor is up for 00:01:44
Authentication Sequence: [ 0 ]
Router ID: 3.3.3.3 Address: 192.168.1.3 GR State: Normal
State: Full Mode: Nbr is Slave Priority: 2
DR: 192.168.1.1 BDR: 192.168.1.3 MTU: 0
Dead timer due in 39 sec
Neighbor is up for 00:01:41
Authentication Sequence: [ 0 ]
SwitchA becomes the DR, and SwitchC is the BDR.
n
If the neighbor state is full, it means SwitchD has established adjacency with the
neighbor. If the neighbor state is 2-way, it means the two switches are neither the
DR nor the BDR, and they do not exchange LSAs.
# Display OSPF interface information.
[SwitchA] display ospf interface
OSPF Process 1 with Router ID 1.1.1.1
Interfaces
Area: 0.0.0.0
IP Address Type State Cost Pri DR BDR
192.168.1.1 Broadcast DR 1 100 192.168.1.1 192.168.1.3
[SwitchB] display ospf interface
OSPF Process 1 with Router ID 2.2.2.2
Interfaces
Area: 0.0.0.0
IP Address Type State Cost Pri DR BDR
192.168.1.2 Broadcast DROther 1 0 192.168.1.1 192.168.1.3
n
The interface state DROther means the interface is not the DR/BDR.
Configuring OSPF
Virtual Links
Network requirements
In the following figure, Area2 has no direct connection to Area0, and Area1 acts
as the Transit Area to connect Area2 to Area0 via a configured virtual link between
SwitchB and SwitchC.
After configuration, SwitchA can learn routes to Area2.