From: Rocco R21 (roccor21@hotmail.com)
Date: Thu Feb 22 2007 - 12:38:46 ART
Unless the DF bit is set. Then the router drops the packet if fragmentation
is required. You can also clear the DF bit w/route-map or DF bit override
when using IPSec tunnels.
rr
>From: johngibson1541@yahoo.com
>Reply-To: johngibson1541@yahoo.com
>To: ccielab@groupstudy.com
>Subject: no need to adjust mtu for having trunk links, but need to adjust
>mtu for dot1q tunnel
>Date: Thu, 22 Feb 2007 00:47:50 -0500
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>
>I know the internet has almost all different mtu in every link,
>this is fine because the routers can fragment packets. The
>hosts reassemble packets.
>
>a switch, if all switching/bridging no routing, can not fragment
>packets right? all the layer 2 ports in 1 switch have to have exact
>same mtu, thats why 3550's mtu command is in global mode, not
>possible to be in layer interface mode, right (imagine received
>a 1000 byte packet from a MTU 1200 port and have to send this
>packet to a MTU 500 port) ?
>
>For the baby giant issue for trunk link's tag, the switch says MTU 1500,
>but it accepts, say, 1520. I am not 100% sure. Don't know which command can
>show
>the actual tolerance.
>
>That was for the tags of trunk links.
>
>So maybe they have maxed out the tolerance for tunk link's tags. Now
>dot1q tunnel needs more tolerance, Maybe when we configure MTU 1504,
>it will make the switch accept 1524 ?
>
>John
>
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