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With MPLS - No Fragmantation with MTU Size 1501-1504

Ping with MTU 1500 and 1505 is OK.

Ping with MTU 1501-1504 doesn?t work - there is no fragmantation done.

This occures on a Cisco7200 and Cisco7500 where traffic is sended via a labeld switch path: MTU-Size from the Fast/Gig Eth-Interface is set to 1500. With no MPLS "no mpls ip" everthing works fine.

Does anyone have a solution for this?

Thanks and Regards

Erich

3 REPLIES
Silver

Re: With MPLS - No Fragmantation with MTU Size 1501-1504

Sounds like an hardware issue to me. Does anything sbove 1505 works? Which kind of PAs do you have on the router? What is your present MPLS MTU size?

Re: With MPLS - No Fragmantation with MTU Size 1501-1504

Hello,

did you configure "mpls mtu 1512" on all MPLS enabled interfaces? F.e.:

interface FastEthernet0/0/0

mpls mtu 1512

This would allow for as much as 3 labels.

There is no fragmentation for labeled packets, only for IP. So this could be a software/hardware bug as well.

Hope this helps! Please rate all posts.

Regards, Martin

New Member

Re: With MPLS - No Fragmantation with MTU Size 1501-1504

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