strange problem with mpls

Unanswered Question
Mar 14th, 2010


I have one branch connected through MPLS to me

The branch side is ATM to Telco and on my side it's connected to Telco thru Gig ethernet .

interface GigabitEthernet0/3.65
encapsulation dot1Q 3456
ip address
mpls ip

interface ATM6/0.650 point-to-point
ip address
  atm route-bridged ip
mpls ip
pvc 0/138
  protocol ip broadcast
  encapsulation aal5snap

I faced a strange problem that I can't ping to IP's on branch side with packet size greater than 500 bytes ,but if disable mpls ip from the interface it's working . Any Clues ?


I have this problem too.
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jcozzupoli Sun, 03/14/2010 - 05:28

Hi Harris,

Check MTU configurations on both ends. Also, is it possible to ping the with "mpls ip" configured with default packet size (100 bytes)? I suspect MTU or encapsulation configuration errors.




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