Sunday, April 9, 2017

OSPF adjacency not forming ?

Router ID 3.3.3.3 (172.16.1.1) and router ID 4.4.4.4 (172.16.1.2) is not forming adjacency. I was thinking how to troubleshoot this.




Then I did a packet capture and saw that both routers are sending OSPF hello pkts



So why are they not forming adjacency ???  Let's look in to the hello pkts to see whether there is any obvious  difference between the hellos 




Then I corrected the configuration


R4#show running-config | section ospf
router ospf 1
 router-id 4.4.4.4
 area 172 stub
 redistribute eigrp 1 subnets
 network 172.16.1.0 0.0.0.255 area 172
R4#

R4#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
R4(config)#
R4(config)#router  ospf 1 
R4(config-router)#no area 172 stub 
R4(config-router)# 
R4(config-router)#area 172 nssa 
R4(config-router)#
R4(config-router)#end
R4#
*Apr  9 11:42:17.315: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on FastEthernet0/0 from LOADING to FULL, Loading Done
*Apr  9 11:42:18.311: %SYS-5-CONFIG_I: Configured from console by console
R4# 
R4#show ip ospf neighbor 

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           1   FULL/BDR        00:00:38    172.16.1.1      FastEthernet0/0
R4#
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