From: ron.wilkerson@gmail.com
Date: Fri Jan 09 2009 - 11:19:09 ARST
Best to have the same mtu in all switches. If you only change the mtu for a certain L2 path, what will happen when that path changes? The new switches will drop the larger frames. If they're all accepting the giant/jumbo frames, you'll be good to go.
Ron
-----Original Message-----
From: "CCIE To Be" <ccie.tobe81@gmail.com>
Date: Fri, 9 Jan 2009 16:59:39
To: <smorris@internetworkexpert.com>
Cc: Cisco certification<ccielab@groupstudy.com>
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
>
>
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