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Configuring OSPF DR Election 105
area 0.0.0.0
network 196.1.1.0 0.0.0.255
■ Perform the following configuration on Switch B.
#
router id 2.2.2.2
#
vlan 1
#
interface Vlan-interface 1
ip address 196.1.1.2 255.255.255.0
ospf dr-priority 0
#
ospf 1
area 0.0.0.0
network 196.1.1.0 0.0.0.255
■ Perform the following configuration on Switch C.
#
router id 3.3.3.3
#
vlan 1
#
interface Vlan-interface 1
ip address 196.1.1.3 255.255.255.0
ospf dr-priority 2
#
ospf 1
area 0.0.0.0
network 196.1.1.0 0.0.0.255
■ Perform the following configuration on Switch D.
#
router id 4.4.4.4
#
vlan 1
#
interface Vlan-interface 1
ip address 196.1.1.4 255.255.255.0
#
ospf 1
area 0.0.0.0
network 196.1.1.0 0.0.0.255
Precautions ■ The DR election is performed only on broadcast and NBMA interfaces rather
than P2P or P2MP interfaces.
■ A DR is an interface of a router and belongs to a single network segment. A
router’s interface may be a DR, while another interface of the router may be a
BDR or DRother.
■ The DR priority of a router interface affects the DR and BDR election. However,
it does not effect the election immediately after the DR and BDR election ends.
A new DR priority assigned to a router interface takes effect at the time of next
DR and BDR election.
■ A DR may not be a router interface with the highest priority in a network, and
a BDR may not be a router interface with the second highest priority.