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New Member

DMVPN, Ospf stuck in exchange state !

Hi all, i am using DMVPN in my environment, till now i have configured it successfully in 8 spokes. 2 spokes are creating issues in the sense that, ospf gets stuck in exchange state. On hub site this is the result of sh ip nhrp for these 2 spokes

172.27.0.35/32 via 172.27.0.35, Tunnel111 created 00:11:48, expire 01:48:11

Type: dynamic, Flags: unique nat registered used

NBMA address: x.x.x.x

172.27.0.42/32 via 172.27.0.42, Tunnel111 created 00:29:58, expire 01:30:02

Type: dynamic, Flags: unique nat registered used

NBMA address: 192.168.223.22

Now as you can see both of them are showing flags unique nat registered !! i read on cisco doc and it seems that this shouldnt be an issue. I am using 1841 with advseck9 ios 12.4(11)T1 and T5. This is common in both spokes. i tried the bugtoolkit but didnt see any related bugs :-( can someone tell me whats the issue. On both the spokes the flag is shown as only "nat", whereas on other spokes its

Type: static, Flags: authoritative !!

Does this difference in flags makes any sense ?

Kindly help me out

2 REPLIES
New Member

Re: DMVPN, Ospf stuck in exchange state !

Thanks all, i found the answer in other post. It has to do with tcp adjust-mss. I have set it correctly now lets hope my applications doesnt suffer :-)

Thanks anyway to all

New Member

Re: DMVPN, Ospf stuck in exchange state !

NOO !!, the issue is still there, i dont know why it worked at that time, but right now its not working :-( i have used ip os mtu-ignore but no progress !!

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