From: Waterman, Roy (Roy.Waterman@colt.net)
Date: Sat Jan 10 2009 - 10:15:39 ARST
If the access VLAN configured on the R1 & R2 access links is removed
from the trunk links to SW1 & SW2 then in actual fact there will be no
redundant path in the network anyway.
So any STP changes for that VLAN will be...redundant (pardon the pun)
Naturally though any sane network will have redundant paths, for err
redundancy's sake.
(I can't see myself making a post in future with the word "redundant" in
it as many times)
Regards
Roy
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ron.wilkerson@gmail.com
Sent: 09 January 2009 13:19
To: CCIE To Be; smorris@internetworkexpert.com
Cc: Cisco certification
Subject: Re: MTU for dot1q-tunnel
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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