Re: Service Instances and bridge domains MTU

Did you change your MTU to 1508? If your using QnQ you're going to need
extra MTU for the s-tag/tagging.

On 5/11/13 6:01 AM, "Eric campbell" <ericwcampbell_at_yahoo.com> wrote:

>Folks,
>
>I just want to start off by saying thanks to all of the regulars in the
>group for the consistent knowledge sharing.
>
>I am a long time Lurker, but I have stumbled onto something which has me
>puzzled to say the least.
>
>I am attempting to create a bridge domain between two interfaces on an
>ASR 1006 and am running into a strange MTU issue.
>
>Everything is working fine I am tunneling my q-in-q/802.1q traffic
>popping and pushing the necessary tags and what not, however when I try
>to ping accross it using a 1500 byte packet with the df bit set i cannot.
>I can ping across it with a 1400 byte packet but of course this is not
>the magic number.
>
>I have tried setting the MTU at the interfaces involved (gig interfaces)
>but cannot for the life of me figure out why this is happening. This
>happens with a single tag as well as a stack of them. I do not have a BDI
>interface at the moment, but I am not sure i really need one since I am
>transiting the box. The only thing that i am able to think of at the
>momment is some sort of system wide MTU setting. This may become a no duh
>moment for me in the end, but I cannot find the command if it exists. Any
>guidance would be appreciated. If there is any information that is
>lacking let me know and i will get it out here.
>
>Thanks to all,
>Eric
>
>
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Received on Sat May 11 2013 - 12:48:08 ART