OSPF Flap in NSSA

[Haris P]

Dear All ,

Im running OSPF between two of my router and there is two links between this routers (say R1 and R2) .

R1 (Area 0------------------R2(Area 1...NSSA)

Now my OSPF relationship is flapping . I already put the below settings on both side of my interface . But still it is flapping

ip mtu 1492
ip tcp adjust-mss 1444
ip ospf network point-to-point
ip ospf mtu-ignore

Feb 27 09:26:02: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.2.1  on FastEthernet4/3 rom FULL to DOWN, Neighbor Down: Dead timer expired

Regards

[sean_evershed]

- Do both neighbors have the same hello and dead timers?

- Do both neighbors use the same authentication password (if it’s used)?

- What output do you get if you issue the command debug ospf adjaceny?

- Have you spoken to your carrier? There may be some faults on the WAN link.

- Are the links congested?

[Haris P]

- Do both neighbors have the same hello and dead timers?

     Yes its same on both interface

     Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

- Do both neighbors use the same authentication password (if it’s used)?

     no passwords set

- What output do you get if you issue the command debug ospf adjaceny?

The below is outputs

     Feb 27 11:41:03: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on FastEthernet4/1 from LOADING to FULL, Loading Done
     16w0d: OSPF: Build router LSA for area 1, router ID 1.1.1.1, seq 0x800001BD
     16w0d: OSPF: 2.2.2.2 address 192.168.10.1 on FastEthernet4/1 is dead
     16w0d: OSPF: 2.2.2.2 address 192.168.10.1 on FastEthernet4/1 is dead, state DOWN

- Have you spoken to your carrier? There may be some faults on the WAN link.

Not yet ,The links are not congested and im not seeing any packet drops .What other problem can be because of WAN link ?

- Are the links congested?

No

Regards

Haris

[sean_evershed]

So as to limit the amount of debug info you get on the interface used for the OSPF neighbour issue the command:

debug interface XXX

Then issue the command
debug ip ospf hello

[Haris P]

I opened a case with cisco and TAC told me that there is some issue with

the code im running

and he suggested to put the neighbor in nbma and to hardcore the

neighbor and after that it worked fine

Regards