Leigh Anne,
This is completely false what you have just said, here is the output from a switch:
4000-7-1 (enable) sh cam dynam 2/17
* = Static Entry. + = Permanent Entry. # = System Entry. R = Router
Entry. X = Port Security Entry
VLAN Dest MAC/Route Des Destination Ports or VCs / [Protocol Type]
---- ------------------
----------------------------------------------------
1 00-50-8b-9b-22-b2 2/17 [ALL]
Total Matching CAM Entries Displayed = 1
4000-7-1 (enable) set cam aging ?
Usage: set cam agingtime <vlans> <agingtime>
(agingtime = 0, 15..1000000 seconds, 0 to disable)
vlans = 1..1005
An example of vlans is 2-10,1005)
4000-7-1 (enable) set cam aging 1 10000
Vlan 1 CAM aging time set to 10000 seconds.
4000-7-1 (enable) sh cam aging
VLAN 1 aging time = 10000 sec
VLAN 1003 aging time = 300 sec
VLAN 1005 aging time = 300 sec
4000-7-1 (enable) sh cam dyanm 2/17
Usage: show cam [count] <dynamic|static|permanent|system> [vlan]
show cam <dynamic|static|permanent|system> <mod_num/port_num>
show cam <mac_addr> [vlan]
show cam agingtime
4000-7-1 (enable) sh cam dynam 2/17
* = Static Entry. + = Permanent Entry. # = System Entry. R = Router
Entry. X = Port Security Entry
VLAN Dest MAC/Route Des Destination Ports or VCs / [Protocol Type]
---- ------------------
----------------------------------------------------
1 00-50-8b-9b-22-b2 2/17 [ALL]
Total Matching CAM Entries Displayed = 1
4000-7-1 (enable) pull the cable
Unknown command "pull". Use 'help' for more info.
4000-7-1 (enable) 2000 Jul 06 14:22:45 %PAGP-5-PORTFROMSTP:Port 2/17
left bridge port 2/17
4000-7-1 (enable) sh cam dynam 2/17
* = Static Entry. + = Permanent Entry. # = System Entry. R = Router
Entry. X = Port Security Entry
VLAN Dest MAC/Route Des Destination Ports or VCs / [Protocol Type]
---- ------------------
----------------------------------------------------
4000-7-1 (enable)
Notice that after the cable was pulled, the mac address was purged.
Leigh Anne Chisholm wrote:
> 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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>
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