[nflug] Cisco Switch question on cloned NIC card

[David J. Andruczyk]

There's a little trouble with that method..  The Mac address tables
take time for entries to expire and disappear (I thyink for a cisco
switch they default to 30 seconds or so). They don't go as soon as the
cable is unplugged.  Hence if he has a failover setup the unplug cable
route is faster for his needs,  but either way should effectively work,
though I think the route you outlined requires more effort.


> You should not have to turn on logging.  All you should have to do is
> examine
> the arp and mac-address tables after you unplug the cable that you
> know the
> port association for, or even simpler - just do a shut on the port,
> that way
> you do not have to trace cables at all.
> 
> 
> Quoting "David J. Andruczyk" <djandruczyk at yahoo.com>:
> 
> > What model switch and firmware is in use on it? (i.e. enterprise,
> std,
> > etc)
> >
> >
> > --- anthonyriga <torrodimerda at yahoo.com> wrote:
> >
> > > Ok I,m still learning the cisco stuff how do I turn on
> > > the logging to do this? Thanks for the help!!!!
> > >
> > > --- "David J. Andruczyk" <djandruczyk at yahoo.com>
> > > wrote:
> > >
> > > >
> > > >
> > > > --- anthonyriga <torrodimerda at yahoo.com> wrote:
> > > >
> > > > > They are setup as failover if I pull one cat5 out
> > > > the
> > > > > other still works.
> > > > >
> > > >
> > > > Turn up logging on the switch and the port change
> > > > messages will tell
> > > > you the ports that the lines are plugged into.
> > > >
> > > >
> > > > > --- "David J. Andruczyk" <djandruczyk at yahoo.com>
> > > > > wrote:
> > > > >
> > > > > >
> > > > > > It sounds like they aren't configured for load
> > > > > > balance,  but as
> > > > > > failover (hence the single mac for both ports)
> > > > > >
> > > > > > How doe you have then comfigured for sure on the
> > > > > > server side?
> > > > > >
> > > > > > One way you can tell is to enable full
> > > > > > logging/debugging on the switch
> > > > > > and pull the connections out one at a time and
> > > > note
> > > > > > the log entries
> > > > > > generated. (it'll also give you clues if you
> > > > have
> > > > > > failover configured
> > > > > > correctly), beware this isn't recommended
> > > > practice
> > > > > > on production
> > > > > > servers unless you have a downtime window that
> > > > can
> > > > > > be made use of.
> > > > > >
> > > > > >
> > > > > > --- anthonyriga <torrodimerda at yahoo.com> wrote:
> > > > > >
> > > > > > > Company I am working for has about 20 or so
> > > > > > servers
> > > > > > > setup with the Intel GIG NIC cards cloned for
> > > > > > > redundancy and network load balance. The nic
> > > > cards
> > > > > > > have 2 ports on them  but 1 mac address. I am
> > > > > > trying
> > > > > > > to figure out what ports the actual CAT5 cable
> > > > is
> > > > > > > connecting too from the server to the the GIG
> > > > > > switch
> > > > > > > without tracing everything manually becasuse
> > > > the
> > > > > > > cables are a mess.
> > > > > > >  I have been sucessful getting the ports on
> > > > the
> > > > > > non
> > > > > > > Intel cards that only have 1 port on them. I
> > > > have
> > > > > > been
> > > > > > > doing a show arp then using the show
> > > > > > mac-address-table
> > > > > > > | in nnnn
> > > > > > >  where nnnn has any character of the mac
> > > > address
> > > > > > in
> > > > > > > it...
> > > > > > >
> > > > > > > It will then show you the port the mac address
> > > > is
> > > > > > > assigned to..
> > > > > > > The NIC cards with 2 cat5 cables going to the
> > > > > > switch
> > > > > > > only show 1 port becasue there is only 1 mac
> > > > > > address
> > > > > > > it reconizes. Any suggestions on how to show
> > > > the
> > > > > > other
> > > > > > > port?
> > > > > > >
> > > > > > >
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> > > > > > Dave J. Andruczyk
> > > > > >
> > > > > >
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> >
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Dave J. Andruczyk

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