MTU Issues

Unanswered Question
Oct 6th, 2009




AS per above topology,am not able to transfer files with MTU frame size above 1492 though the MTU configured on interface is 1500.The link between DS/PE---CR/PE is mpls enabled i have configured the MTU size to 1524 to carry extra labels of MPLS as recommended by cisco.

When i do extnded ping from DS/PE above MTU size of 1492 with even DF bit not set am not able to ping customer end (B),

AND also i tried with DF bit set am not able to recieve any notifications ICMP destination unreacheable messages.

The file transfer from customer B with packet size above 1492 are received by customer A but when the connection are initiated through customer A they are not.

Within an enterprise it works with larger MTU size when tried to ping from DS loopback to core loopback.How can i troubleshoot it is a problem through my end or from the ISP.

response will be appreciated

I have this problem too.
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Harold Ritter Wed, 10/07/2009 - 06:07


Is this l2vpn or l3vpn in the core. What are the devices used for PE and P routers?



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