[nflug] Cisco Switch question on cloned NIC card

[anthonyriga]

So basically if I unplug one of the cables on the
cloned NIC card on the server I should be able to do a
show arp then show mac-address-table thus it giving me
the other port that the server. makes sense now Thanks
for your help!!! 

--- kobear at sharedbrain.net wrote:

> Sorry - I forgot the step to wait 30 seconds before
> viewing the tables ;)
> 
> Quoting "David J. Andruczyk"
> <djandruczyk at yahoo.com>:
> 
> > 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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> > > > > > > >
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> > > > > >
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