From: McClure, Allen (Allen.McClure@Tricon-Yum.Com)
Date: Fri Oct 04 2002 - 17:08:50 GMT-3
Some thoughts:
1. Clear the DF bit if one is set, and allow fragmentation.
2. Reduce the MTU of your switch and avoid fragmentation by sending
smaller frames
3. Enable mtu path discovery
Not meant a solutions, but more as things to consider.
Allen McClure
MCSE, CCNP, CCDP
YUM! Brands, Inc.
Sr. Network Analyst
NEW E-Mail - mailto:allen.mcclure@yum.com
972-338-7494
-----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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