From: Donny MATEO (donny.mateo@sg.ca-indosuez.com)
Date: Sat Oct 05 2002 - 00:08:22 GMT-3
Correct me if I'm wrong
ip mtu and mtu are different. In a way for IP MTU is the packet(L3) size that is check and then
depending on whether fragmentation is allowed or not packet could still be sent over the link. If
you enable fragmentation, the L3 packet that exceed the specified ip mtu would just be chop down
into serveral packet and will still be sent by the route.
mtu on the interface is to set the maximum size of the frame (L2), meaning it guarantee the size of
the frame that is sent over the L2 media.
Donny
"Pylko, Eric"
<EPylko@frontrunnerne To: ccielab@groupstudy.com
tworks.com> cc:
Sent by: Subject: RE: Bridging 802.1q
nobody@groupstudy.com
05-10-2002 04:28
Please respond to
"Pylko, Eric"
Why not increase the MTU size on the interface? Isn't it "ip mtu ..."
instead of "mtu ..."?
-Eric
-----Original Message-----
From: Huy Luu [mailto:hluu@veroxity.com]
Sent: Thursday, October 03, 2002 4:32 PM
To: ccielab@groupstudy.com
Subject: OT:Bridging 802.1q
Hello gents,
Can you guys help me?
here's the scenario:
SwitchA--------802.1q-------Router-----------T1------------Router-------
802.1q--------SwitchB
I tried to configure the router to bridge 802.1q accross from swtich A
to switch B. The routers ethernet interface are hardcoded with 1500
MTU, so when lardge packets are passed through, the 802.1q header makes
increase
the size of the packet over 1500 bytes and the packet is dropped.
Seems
like the only cisco equipment that allows changing the MTU on ethernet
is a GSR, which is too expensive to carry T1.
Is there any other version of the IOS or hardware that allows MTU size
to be manipulated over the 1500 bytes limit on ethernet interface on
routers?
Is there another vendor with a router that supports both a T1 interface
and allow MTU to be changed?
thanks in advance.
Huy Duc Luu
Veroxity Technology Partners
Fax 617-779-3099
Cell# (617) 293-0940
Email: hluu@veroxity.com
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