From: Scott Morris (smorris@internetworkexpert.com)
Date: Fri Jan 09 2009 - 12:57:16 ARST
There's nothing preventing you from changing the MTU on all switches. In a
real-life scenario, I would likely do that for consistency. But in your
lab, you either do that (if allowed/desired) or you follow the traffic!
Scott
From: CCIE To Be [mailto:ccie.tobe81@gmail.com]
Sent: Friday, January 09, 2009 8:00 AM
To: smorris@internetworkexpert.com
Cc: Cisco certification
Subject: Re: MTU for dot1q-tunnel
Would it not be an extra configuration to set MTU 1504 on all switches even
if the traffic flow is not through above 2 switches ( SW1 & SW2 ) ?
As discussed before we need to check the path of traffic as well. So this
means we should consider the 'root' switch for the VLAN which is being use
to double tag the customer's traffic ??
If the root switch for those VLANs is different from SW3 & SW4 then we
should change MTU on all switches OR can we say that it would be a best
practice to change MTU on all switches despite of traffic flow ??
Thanks
On Fri, Jan 9, 2009 at 4:07 PM, Scott Morris
<smorris@internetworkexpert.com> wrote:
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 <http://www.ccie.net/>
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