OSPF exstart state

Unanswered Question
May 11th, 2007

When my primary link goes down, ISDN Ospf neighbourship is going to exstart state.

Rtr BL----

interface Dialer1

ip address XXX XXX

no ip redirects

encapsulation ppp

ip route-cache flow

load-interval 30

dialer pool 1

dialer remote-name m

dialer idle-timeout 300

dialer string XXXXX

dialer string XXXXX

dialer string XXXXX

dialer load-threshold 78 either

dialer-group 1

no cdp enable

ppp authentication chap

ppp multilink

end

Router MC

-----

interface Dialer1

description xXX

ip address XXXX XXXXXX

no ip redirects

encapsulation ppp

ip route-cache flow

no ip mroute-cache

dialer in-band

dialer idle-timeout 300

dialer map ip XXXX name BL broadcast XXXXXX

dialer load-threshold 25 either

dialer-group 1

no fair-queue

no cdp enable

ppp authentication chap

ppp multilink

end

both the interface ip's are allowed in OSPF.

What could be the reason for not establishing the full state in OSPF? pls advice

I have this problem too.
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rajaajmer Sat, 05/12/2007 - 01:35

i have checked the MTU size , its 1500 on both router (dialer) interface.

mohammedmahmoud Sat, 05/12/2007 - 00:12

Hi,

Can you please send "show ip ospf neighbor", and the OSPF process configuration on both routers.

BR,

Mohammed Mahmoud.

rajaajmer Sat, 05/12/2007 - 01:33

This is while the issue was happening.

sh ip ospf nei

Neighbor ID Pri State Dead Time Address Interface

172.241.247.47 1 FULL/BDR 00:00:36 170.241.247.250 FastEthernet0/1

172.241.247.46 1 FULL/BDR 00:00:39 170.241.247.246 FastEthernet0/0

172.241.242.189 1 EXSTART/ - 00:00:39 170.241.247.69 Dialer1

mohammedmahmoud Sat, 05/12/2007 - 01:42

Hi,

The problem is most frequently caused by the inability to successfully exchange DBD packets which many be due to neighbor between PRI and BRI/dialer, let me check it and get back to you.

HTH,

Mohammed Mahmoud.

royalblues Sat, 05/12/2007 - 06:47

I had faced a similar situation (not with an ISDN interafce though) where we chnaged the module and the symptom got rectified.

Can you try establishing the adjaceny over the ISDN interface without configuring it as backup for the primary?

Narayan

rajaajmer Sat, 05/12/2007 - 23:46

simulating it,at this point of time will not be possible. but wanted to know the there can be some other reason other than MTU , which will make the state of OSPF to EXSTART

rajaajmer Sat, 05/19/2007 - 10:08

Can somebody help me getting the reason for my probelm please ?

Harold Ritter Sat, 05/19/2007 - 10:44

Sarosh,

Have you tried running a "show ip ospf adj" on these two routers? This would give you a good hint of what the issue is.

Hope this helps,

Harold Ritter Sat, 05/19/2007 - 11:09

I would also try setting a "dialer map ip broadcast" on either side. Currently, only router MC is configured this way.

Hope this helps,

Harold Ritter Sat, 05/19/2007 - 11:20

Sorry, I wrote to quickly. I meant setting the "dialer map ip broadcast" on both sides.

Regards,

rajaajmer Sat, 05/19/2007 - 11:50

"dialer map Ip broadcast " is configured on MC, because that the router from which the dialing to taking place. I want MC to dial.

Harold Ritter Sat, 05/19/2007 - 12:51

You are not forced to configure a phone number on this command. You could just configured it as follow if you don't want BL to dial:

dialer map ip x.x.x.x boradcast name xxx

Hope this helps,

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