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Use the ip ospf priority command to change the DR and BDR as follows:
R1 should be the BDR and will be configured with a priority of 10.
R2 should never be a DR or BDR and will be configured with a priority of 0.
R3 should be the DR and will be left with the default priority of 100.
On all routers, use g0/0/0 for the interface name.
You are logged into R1 in global configuration mode. Configure R1 with a priority of 10.
R1(config)#interface g0/0/0
R1(config-if)#ip ospf priority 10
R1(config-if)#
Agora você está conectado ao R2 no modo de configuração global. Configure o R2 com uma prioridade de 0.
R2(config)#interface g0/0/0
R2(config-if)#ip ospf priority 0
R2(config-if)#
Agora você está conectado ao R3 no modo de configuração global. Configure o R3 com uma prioridade de 100.
R3(config)#interface g0/0/0
R3(config-if)#ip ospf priority 100
R3(config-if)#
Você ainda está conectado ao R3 no modo de configuração da interface. Volte ao modo EXEC privilegiado. Como R3 deve ser o DR, reinicie o processo de OSPF nele primeiro.
R3(config-if)#end
R3#clear ip ospf process
Reset ALL OSPF processes? [no]:y
*Jun 5 05:29:35.231: %OSPF-5-ADJCHG: Process 10, Nbr 1.1.1.1 on GigabitEthernet0/0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Jun 5 05:29:35.231: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on GigabitEthernet0/0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Jun 5 05:29:35.235: %OSPF-5-ADJCHG: Process 10, Nbr 1.1.1.1 on GigabitEthernet0/0/0 from LOADING to FULL, Loading Done
*Jun 5 05:29:44.563: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on GigabitEthernet0/0/0 from LOADING to FULL, Loading Done
R3#
Agora você está conectado ao R1 no modo EXEC privilegiado. Como R1 é o ser DR, reinicie o processo de OSPF nele em seguida.
R1#clear ip ospf process
Reset ALL OSPF processes? [no]:y
*Jun 5 05:27:20.691: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on GigabitEthernet0/0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Jun 5 05:27:20.691: %OSPF-5-ADJCHG: Process 10, Nbr 3.3.3.3 on GigabitEthernet0/0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Jun 5 05:27:21.695: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on GigabitEthernet0/0/0 from LOADING to FULL, Loading Done
*Jun 5 05:27:20.951: %OSPF-5-ADJCHG: Process 10, Nbr 3.3.3.3 on GigabitEthernet0/0/0 from LOADING to FULL, Loading Done
R1#
Agora você está conectado ao R2 no modo EXEC privilegiado. R2 será DROTHER. Reinicie o processo de OSPF.
R2#clear ip ospf process
Reset ALL OSPF processes? [no]:y
*Jun 5 15:37:08.978: %OSPF-5-ADJCHG: Process 10, Nbr 1.1.1.1 on GigabitEthernet0/0/0 from 2WAY to DOWN, Neighbor Down: Interface down or detached
*Jun 5 15:37:08.978: %OSPF-5-ADJCHG: Process 10, Nbr 3.3.3.3 on GigabitEthernet0/0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Jun 5 15:37:08.983: %OSPF-5-ADJCHG: Process 10, Nbr 1.1.1.1 on GigabitEthernet0/0/0 from LOADING to FULL, Loading Done
*Jun 5 15:37:19.477: %OSPF-5-ADJCHG: Process 10, Nbr 3.3.3.3 on GigabitEthernet0/0/0 from LOADING to FULL, Loading Done
R2#
Agora você está conectado ao R1. Use o comando show ip ospf interface g0/0/0 para verificar se o R1 é o BDR.
R1#show ip ospf interface g0/0/0
GigabitEthernet0/0/0 is up, line protocol is up
Internet Address 192.168.1.1/24, Area 0, Attached via Interface Enable
Process ID 10, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State BDR, Priority 10
Designated Router (ID) 3.3.3.3, Interface address 192.168.1.3
Backup Designated router (ID) 1.1.1.1, Interface address 192.168.1.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:04
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 2
Last flood scan time is 0 msec, maximum is 1 msec
Neighbor Count is 2, Adjacent neighbor count is 2
Adjacent with neighbor 2.2.2.2
Adjacent with neighbor 3.3.3.3 (Designated Router)
Suppress hello for 0 neighbor(s)
R1#
Agora você está conectado ao R2. Use o comando show ip ospf interface g0/0/0 para verificar se o R2 é um DROTHER.
R2#show ip ospf interface g0/0/0
GigabitEthernet0/0/0 is up, line protocol is up
Internet Address 192.168.1.2/24, Area 0, Attached via Interface Enable
Process ID 10, Router ID 2.2.2.2, Network Type BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 3.3.3.3, Interface address 192.168.1.3
Backup Designated router (ID) 1.1.1.1, Interface address 192.168.1.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 2
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 2, Adjacent neighbor count is 2
Adjacent with neighbor 1.1.1.1 (Backup Designated Router)
Adjacent with neighbor 3.3.3.3 (Designated Router)
Suppress hello for 0 neighbor(s)
R2#
Você agora está conectado em R3. Use o comando show ip ospf interface g0/0/0 para verificar se o R3 é o DR.
R3#show ip ospf interface g0/0/0
GigabitEthernet0/0/0 is up, line protocol is up
Internet Address 192.168.1.3/24, Area 0, Attached via Interface Enable
Process ID 10, Router ID 3.3.3.3, Network Type BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State DR, Priority 100
Designated Router (ID) 3.3.3.3, Interface address 192.168.1.3
Backup Designated router (ID) 1.1.1.1, Interface address 192.168.1.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 3
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 2, Adjacent neighbor count is 2
Adjacent with neighbor 1.1.1.1 (Backup Designated Router)
Adjacent with neighbor 2.2.2.2
Suppress hello for 0 neighbor(s)
R3#
Você alterou com êxito a prioridade OSPF.