Intermittent ping drop on MPLS VSAT link.

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Feb 5th, 2009
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We have a client connected through VSAT. I am at Service Provider place and client is connected through VSAT link in MPLS cloud. I am facing intermittent ping drop in the tunnel interface terminated at other end. Pl help how do i check the trouble shoot the problem.

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shivlu jain Thu, 02/05/2009 - 06:36
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hi amit

could you check if you remove the vrf from tunnel interface whats the response in that case ?


shivlu jain

amitmarathe Fri, 02/06/2009 - 02:05
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Thanks for u r reply

we had set mtu size 1420 on the tunnel interface. Till now I had not receive any ping drop. Hope this will work.

I will try with removing vrf if this will occure again.

amitmarathe Fri, 02/06/2009 - 02:10
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When I apply MTU as 1420 on the tunnel interface and when check by show int tunnel xxx. I still get 1514 mtu set on the tunnel interface. Why ?

shivlu jain Fri, 02/06/2009 - 06:49
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actually you have configured ip mtu thats why you were not able to see on interface. If you change then mtu with only mtu command then it will be changed.

only MTU is realted to harware

ip mtu "IP MTU is used to determine whether a non-labeled IP packet forwarded through an interface has to be fragmented (the IP MTU has no impact on labeled IP packets). It has to be lower or equal to hardware MTU (and this limitation is enforced).

kindly check


shivlu jain


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