I've seen this "problem" quite often, and it's helpful that you've brought this up.
In the Catalyst 5000/5500 series switch, the MAC address to port mapping table keeps
entries for 5 minutes (or 300 seconds) by default. When you switch ports (say, moving
a server from a test room to the production location), the table waits the aging time
before the old MAC address/port mapping is removed. This creates the lack of
connectivity you reference.
The aging of the MAC address to port mapping can really play havoc with one's mind
when the default has been changed to the maximum of 20 minutes (someone's decided that
changing this value will optimize switch and network performance). This leaves the
administrator scratching their heads for 20 minutes wondering why they don't have
connectivity.
-- Leigh Anne
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> John Neiberger
> Sent: Thursday, July 06, 2000 9:05 AM
> To: [EMAIL PROTECTED]
> Subject: Easy Brain Teaser (Switching)
>
>
> Here's an easy one, because I'm nicer than Chuck. :-) Even though it's
> easy, it's still practical. And for those of you who immediately know the
> answer, let the less experienced people mull this one over for a bit.
>
> You have a Catalyst 5000 with several servers connected and you've decided
> to rearrange the port assignments. You disconnect one server in
> particular
> and move it to another port, then quickly discover that it now has no
> network connectivity. You attempt to access the network for a couple of
> minutes to no avail. In supreme frustration, you head to the
> break room for
> coffee and donuts.
>
> When you come back several minutes later you find that the server now has
> network connectivity and all is well, no problems.
>
> What is the most likely cause of this behavior and what could you
> have done
> to remedy the situation immediately?
>
> Good luck!
>
> John
>
>
>
>
>
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