only use portfast on workstations or servers. it will prevent another
switch or hub from participating in the spanning tree. I don't think I
would enable portfast just to save users 20 seconds or so of startup one
time while you swap switches.
Unless you are in a 24x7 shop there must be some time when you can swap them
without inconveniencing your users. Even if you are 24x7, if you are
already committed to making the swap they probably won't notice if your
downtime is ten minutes or only nine. Unless your servers or whatever the
workstations are talking to are on the same switch you wait for spanning
tree on your uplink port(s) anyway.
If you notice problems logging in when you power up the workstations then
portfast can help. I've seen situations where a win95/98 workstation can't
log in immediately because the status light hasn't changed to green yet
(spanning tree, autosensing speed and autosensing duplex can take a little
while). They'll get a "do domain server found" message and then they try
again they get in okay. It's kind of annoying. In addition to portfast you
can specify speed and duplex (rather than autosense) to speed up that
process. But you add to your management duties.
daveh
-----Original Message-----
From: ed smith [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, September 06, 2000 9:33 AM
To: [EMAIL PROTECTED]
Subject: Portfast ???
I'm swapping out a 2900XL with a 2924C XL to give us Fiber capability. Since
we have customers on the current switch I want to keep down time to a
minimum. One suggestion has been to, on the new switch put it into portfast
mode.
Has anyone done this before? Are there any problems you encountered or
things I should be aware of?
Just a quick note today....
Thanks for any input.
Ed
CCNA
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