11-27-2001 12:19 AM - edited 03-01-2019 07:30 PM
Hello,
We run up to 3 tunnel interfaces on our main 7206 router for some smaller ISP in the country. Now we encounter the following problem: after a few days ( random time ) the tunnel interfaces start to drop packets ( I saw that in show interface tunnel X in the input queue line ) and after a clear interface tunnel X, everything comes back to normal.
The tunnel interfaces are in mode gre, mtu set to 1500.. nothing else.
One thing could be we do not use the primary ip address of the real interface (fastethernet) .. could this be a problem? (we use a secondary one).
And also could anyone tell me what to debug in this case?
Respectuflly,
Teodor Iacob
12-03-2001 03:54 PM
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If anyone else in the forum has some advice, please reply to this thread.
Thank you for posting.
12-10-2001 04:18 AM
Hi,
Not sure if you got this fixed but..
I have a few 7206VXR's using multiple tunnels. I sometimes use loopbacks as tunnel source and destination rather than physical addresses. Also there was an issue with the MTU size with GRE encapsulation as the MTU exceeded the Interface MTU. i cannot recall the software release now but if you have a fairly new IOS image it should be OK else you could fix the MTU at a different size. e.g
interface Tunnel0
description GRE Tunnel0 corpa to RSM via Gi
ip address 193.100.1.5 255.255.255.252
ip mtu 1600
tunnel source 175.2.108.58
tunnel destination 175.2.108.170
Hope this helps.
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