Huawei Quidway S6500 Series Operation Manual page 197

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
[Switch D] router id 4.4.4.4
[Switch D] ospf
[Switch D-ospf-1] area 0
[Switch D-ospf-1-area-0.0.0.0] network 196.1.1.0 0.0.0.255
On Switch A, run display ospf peer to display the OSPF peers. Please note that
Switch A has three peers.
The state of each peer is full, which means that adjacency is set up between Switch A
and each peer. Switch A and Switch C should set up adjacencies with all the routers on
the network so that they can serve as the DR and BDR on the network respectively.
Switch A is DR, while Switch C is BDR on the network. And all the other neighbors are
DR others (which means that they are neither DRs nor BDRs).
# Modify the priority of Switch B to 200:
[Switch B-Vlan-interface2000] ospf dr-priority 200
In Switch A, execute display ospf peer to show its OSPF neighbors. Please note the
priority of Switch B has been modified to 200, but it is still not the DR.
Only when the current DR is offline, will the DR be changed. Shut down Switch A, and
run display ospf peer command on Switch D to display its neighbors. Please note the
original BDR (Switch C) becomes the DR, and Switch B is BDR now.
If all Ethernet Switches on the network are removed and added back again, Switch B
will be elected as the DR (with the priority of 200), and Switch A becomes the BDR (with
a priority of 100). To switch off and restart all of the switches will bring about a new
round of DR/BDR selection.
4.4.2 Configuring OSPF Virtual Link
I. Networking requirements
In the following figure, Area 2 and Area 0 are not directly connected. Area 1 is required
to be taken as transit area for connecting Area 2 and Area 0. Correctly configure a
virtual link between Switch B and Switch C in Area 1.
Huawei Technologies Proprietary
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Chapter 4 OSPF Configuration