Well George, since nobody else answered, I'll help here.
Your logic is a little backwards here. by lowering your MTU, you may remove
the label of baby giants on some of your data (now maybe they'll be giants),
but that is all. Actually, by doing this, you will cause (at least in
theory) additional issues. ISL will actually add 30 bytes, so by moving the
MTU DOWN 30, you are compounding the issue by now possibly having frames
that are 60 bytes too big to be passed. If you are running ISL, I would
bump the MTU up to 1548, not lower it. This way, if the interface "sees"
what was formerly considered a "giant" frame (1518 byte frame + ISL), then
it will still be allowed to be forwarded as it is now an acceptable sive
based on your specified MTU of 1548.
Think of it this way: MTU is an absolute value. This means that the
interface will look at the entire frame size including the ISL portion, not
just the original data only.
Rik
-----Original Message-----
From: George Yiannibas [mailto:[EMAIL PROTECTED]]
Sent: Sunday, May 27, 2001 6:05 AM
To: [EMAIL PROTECTED]
Subject: ISL and MTU [7:6059]
Hi group
I am currently studying for BCMSN 640-504 and I thought of this question: If
you reduce MTU from the default 1518 byte size to 1488 you will not get baby
giant frames if using ISL True or False ?
This is not a question from any book or any exam and I had it since I was
studying for CCNA. Any input is welcome.
PS Thank you all in advance this is a great forum and I learn something new
every day !
George Yiannibas MCSE CCNA
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