H3C Technologies H3C S3600 Series Switches - Manual (Page 354)

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system-view
[SwitchB] interface Vlan-interface 1
[SwitchB-Vlan-interface1] ospf dr-priority 200
On Switch A, use the display ospf peer command to display its OSPF neighbors. Note that the priority
of Switch B has been changed to 200, but it is still not a DR.
The current DR is changed only when it is offline. Shut down Switch A, and use the display ospf peer
command on Switch D to display its neighbors. Note that the original BDR (Switch C) becomes the DR
and Switch B becomes BDR now.
If all Ethernet Switches on the network are removed from and then added to the network again, Switch
B will be elected as the DR (with a priority of 200), and Switch A will be the BDR (with a priority of 100).
Shutting down and restarting all the switches will bring about a new round of DR/BDR election on the
network.
Configuring OSPF Virtual Link
Network requirements
Devices in the network run OSPF to realize interconnection. The network is split into three areas: one
backbone area and two non-backbone areas (Area 1 and Area 2). Area 2 has no direct connection to
the backbone, and it has to reach the backbone through Area 1. The customer hopes that Area 2 can
interconnect with other two areas.
Based on the customer requirements and networking environment, use a virtual link to connect Area 2
to the backbone area.
Network diagram
Figure 4-9 Network diagram for OSPF virtual link configuration
Device Interface IP interface Router ID
Switch A Vlan-int1 196.1.1.1/24 1.1.1.1
Switch B Vlan-int1 196.1.1.2/24 2.2.2.2
Vlan-int2 197.1.1.2/24
Switch C Vlan-int1 152.1.1.1/24 3.3.3.3
Vlan-int2 197.1.1.1/24