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Question 125/159
Scenario
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links.
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.
Use appropriate show commands to troubleshoot the issues and answer all four questions.
Instructions
An OSPF neighbor adjacency is not formed between R3 in the main office and R4 in the Branch1 office.
What is causing the problem?
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links.
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.
Use appropriate show commands to troubleshoot the issues and answer all four questions.
Instructions
An OSPF neighbor adjacency is not formed between R3 in the main office and R4 in the Branch1 office.
What is causing the problem?
Correct Answer: A
Explanation/Reference:
Explanation:
Here are the relevant parts of the router configs:
R1interface Loopback0description ***Loopback***ip address 192.168.1.1 255.255.255.255ip ospf 1 area
0!interface Ethernet0/0description **Connected to R1-LAN**ip address 10.10.110.1 255.255.255.0ip ospf 1 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.1 255.255.255.0ip ospf hello-interval 25ip ospf 1 area 0!router ospf 1log-adjacency-changes R2!interface Loopback0description **Loopback**ip address 192.168.2.2 255.255.255.255ip ospf 2 area
0!interface Ethernet0/0description **Connected to R2-LAN**ip address 10.10.120.1 255.255.255.0ip ospf 2 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.2 255.255.255.0ip ospf 2 area 0!router ospf 2log-adjacency-changes
R3username R6 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.3.3
255.255.255.255ip ospf 3 area 0!interface Ethernet0/0description **Connected to L2SW**ip address
10.10.230.3 255.255.255.0ip ospf 3 area 0!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!interface Serial1/1description **Connected to R5-Branch2 office**ip address 10.10.240.5
255.255.255.252encapsulation pppip ospf hello-interval 50ip ospf 3 area 0!interface Serial1/2description
**Connected to R6-Branch3 office**ip address 10.10.240.9 255.255.255.252encapsulation pppip ospf 3 area 0ppp authentication chap!router ospf 3router-id 192.168.3.3!
R4!interface Loopback0description **Loopback**ip address 192.168.4.4 255.255.255.255ip ospf 4 area
2!interface Ethernet0/0ip address 172.16.113.1 255.255.255.0ip ospf 4 area 2!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2
255.255.255.252encapsulation pppip ospf 4 area 2!router ospf 4log-adjacency-changes R5!interface Loopback0description **Loopback**ip address 192.168.5.5 255.255.255.255ip ospf 5 area
0!interface Ethernet0/0ip address 172.16.114.1 255.255.255.0ip ospf 5 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.6
255.255.255.252encapsulation pppip ospf 5 area 0!router ospf 5log-adjacency-changes R6username R3 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.6.6
255.255.255.255ip ospf 6 area 0!interface Ethernet0/0ip address 172.16.115.1 255.255.255.0ip ospf 6 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.10
255.255.255.252encapsulation pppip ospf 6 area 0ppp authentication chap!router ospf 6router-id
192.168.3.3!
On both R3 and R4 use "show running-config" command to check their S1/0 interfaces R3#show running-config<<output omitted>>!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!<<output omitted>> R4#show running-config<<output omitted>>!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2 255.255.255.252encapsulation pppip ospf 4 area 2!<<output omitted>> In the output above we see their Area IDs are mismatched; interface S1/0 of R3 is in area 0 (R3: ip ospf 3 area 0) while interface s1/0 of R4 is in area 2 (R4: ip ospf 4 area 2).
Explanation:
Here are the relevant parts of the router configs:
R1interface Loopback0description ***Loopback***ip address 192.168.1.1 255.255.255.255ip ospf 1 area
0!interface Ethernet0/0description **Connected to R1-LAN**ip address 10.10.110.1 255.255.255.0ip ospf 1 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.1 255.255.255.0ip ospf hello-interval 25ip ospf 1 area 0!router ospf 1log-adjacency-changes R2!interface Loopback0description **Loopback**ip address 192.168.2.2 255.255.255.255ip ospf 2 area
0!interface Ethernet0/0description **Connected to R2-LAN**ip address 10.10.120.1 255.255.255.0ip ospf 2 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.2 255.255.255.0ip ospf 2 area 0!router ospf 2log-adjacency-changes
R3username R6 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.3.3
255.255.255.255ip ospf 3 area 0!interface Ethernet0/0description **Connected to L2SW**ip address
10.10.230.3 255.255.255.0ip ospf 3 area 0!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!interface Serial1/1description **Connected to R5-Branch2 office**ip address 10.10.240.5
255.255.255.252encapsulation pppip ospf hello-interval 50ip ospf 3 area 0!interface Serial1/2description
**Connected to R6-Branch3 office**ip address 10.10.240.9 255.255.255.252encapsulation pppip ospf 3 area 0ppp authentication chap!router ospf 3router-id 192.168.3.3!
R4!interface Loopback0description **Loopback**ip address 192.168.4.4 255.255.255.255ip ospf 4 area
2!interface Ethernet0/0ip address 172.16.113.1 255.255.255.0ip ospf 4 area 2!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2
255.255.255.252encapsulation pppip ospf 4 area 2!router ospf 4log-adjacency-changes R5!interface Loopback0description **Loopback**ip address 192.168.5.5 255.255.255.255ip ospf 5 area
0!interface Ethernet0/0ip address 172.16.114.1 255.255.255.0ip ospf 5 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.6
255.255.255.252encapsulation pppip ospf 5 area 0!router ospf 5log-adjacency-changes R6username R3 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.6.6
255.255.255.255ip ospf 6 area 0!interface Ethernet0/0ip address 172.16.115.1 255.255.255.0ip ospf 6 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.10
255.255.255.252encapsulation pppip ospf 6 area 0ppp authentication chap!router ospf 6router-id
192.168.3.3!
On both R3 and R4 use "show running-config" command to check their S1/0 interfaces R3#show running-config<<output omitted>>!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!<<output omitted>> R4#show running-config<<output omitted>>!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2 255.255.255.252encapsulation pppip ospf 4 area 2!<<output omitted>> In the output above we see their Area IDs are mismatched; interface S1/0 of R3 is in area 0 (R3: ip ospf 3 area 0) while interface s1/0 of R4 is in area 2 (R4: ip ospf 4 area 2).
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