EIGRP DMVPN routing issue

Unanswered Question
Feb 10th, 2009
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Hi,

I am having an issue with a route to an external DMVPN spoke. The external spoke can ping all internal devices and the DMVPN hub can ping all spokes and connected devices(including the external spoke). All internal spokes can ping each other over dynamically established tunnels. So it seems like the IPSEC/GRE portion of my configuration is correct. The problem lies with a few of the internal spokes trying to reach the external spoke.


Sanitized configs attached. Diagram is here http://img152.imageshack.us/img152/9043/layoutfs3.jpg


When I try to ping from I-SPOKE-1 to E-SPOKE-1, I receive the first ping response but all pings after that time out, and I receive the same condition from I-SPOKE-3 to E-SPOKE-1. The really strange part is that I-SPOKE-2 has complete connectivity, and can ping all devices including the external spoke. When I do a 'sh ip route' all internal spokes have the HUB listed as the next hop to the external spoke, so EIGRP seems to be propagating the correct info, but the HUB just isn't routing it properly. The part the really baffles me is Traceroute works end to end with every device… :-/

I have scrutinized every peace of the configurations and can't figure out what my problem is. If anyone has any ideas or links that might help it would be greatly appreciated.


Thanks in advance,

Joe




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Giuseppe Larosa Tue, 02/10/2009 - 10:34
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Hello Joe,

the command


no ip split-horizon eigrp 90


is usually needed on hub not on spokes


to create dynamic spoke to spoke tunnels


on the hub you need also


no ip next-hop-self eigrp 90


you can check NHRP issues with


sh ip nhrp

debug nhrp


the fact that first packet is fine has some meaning NHRP activity has to be investigated.


Hope to help

Giuseppe


Mohamed Sobair Tue, 02/10/2009 - 10:46
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Hi,


Pls post complete config in text files..



HTH

Mohamed

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