GRE tunnel issue

[vikramfonseca]

Hello team,

I've got a bit of a troublesome issue with the GRE tunnel here, and any help will certainly be appreciated.

I have a GRE tunnel initiating from a Cisco 3845, thro' a Cisco ASA 7.2(4) and terminating on a Cisco 2811.

Thing is, every now and then, the tunnel hangs up and we have to shutdown both ends (interfaces), wait for 5 mins and then bring them back up. This is Cisco's recommendation.

However, this is happening on a more frequent basis and shut , no shut is not a workable option.

Any suggestions on how I can keep the tunnel from hanging up?

Thanks,

[Mohamed Sobair]

Victor,

1- Yes u are correct, I beleive he should apply (Path MTU Discovery) in order to prevent any Packet fragmentation which could cause a High latency an inconssistency performance.

2- If the Tunnel dies, then a possible cause would be a ( Recursive Tunneling ) issue. Make sure the Tunnel Source is not the same as the Tunnel destination.

HTH

Mohamed

[vikramfonseca]

Mohammed,

I'll google Path MTU Discovery. The tunnel source is not the tunnel destination.

Thanks,

[Mohamed Sobair]

Pls Have a look at the bellow link, If u search google u will also get the same:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094690.shtml

HTH

Mohamed