RE: MTU for dot1q-tunnel

From: Scott Morris (smorris@internetworkexpert.com)
Date: Fri Jan 09 2009 - 10:07:16 ARST


Well, let's look at it a different way.... As you follow the path through
your network, IF you were to send out a packet with 1504 bytes, would it
cause a problem on any of the "middle" switches?

If the answer is yes (which it likely is) then yes, everyone should be aware
of that.

;) Follow the frame/packet.

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of CCIE
To Be
Sent: Friday, January 09, 2009 6:37 AM
To: Cisco certification
Subject: MTU for dot1q-tunnel

Dear Group,

Below is the topology,

             SW1-------------------SW2
               | |
               | |
    R1-----SW3------------------SW4--------R2

Trunks are configured among all switches and R1 & R2 are customer's routers.
We need to configure dot1q-tunnel on SW3 and SW4 to transparently pass the
traffic bewteen R1 & R2. My question is that should we need to increase mtu
only on SW3 & SW4 or we should change mtu to 1504 on all switches ??

HTH

Blogs and organic groups at http://www.ccie.net



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