well put...
Joe Pinkus wrote:
> 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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