Re: Traffic On switch without mac-address on mac-address table

I have seen this. In my experience, sometimes what you will have is the
mac-address-table entry for that particular port will time out because there
is no traffic on it. When you then ping the device the mac is re-added to
the mac table

On Mon, Sep 14, 2009 at 10:07 AM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:

> Hope this is not a production network ... ;-)
>
> Mark, is this a L3 port? My guess is that it is ... If possible, ping the
> fw from the switch and then check the arp table via the show ip arp
> command.
>
> If your switch does not have a way to ping the FW, and IF IT IS a
> production
> network, then don't change a thing on the switch. ;-) ... lol
>
> Ping the FW interface from another device and you will be able to see the
> MAC add. HTH,
>
> Andrew
>
>
>
> On Mon, Sep 14, 2009 at 9:02 AM, Iwan Hoogendoorn <iwan_at_ipexpert.com>
> wrote:
>
> > Hi,
> >
> > What will happen if you plug a laptop in the same switchport you have
> > the firewall on and you do a show mac-address-table on the switch?
> >
> >
> > --
> > Regards,
> >
> > Iwan Hoogendoorn
> > CCIE #13084 (R&S / Security / SP)
> > Sr. Support Engineer IPexpert, Inc.
> > URL: http://www.IPexpert.com
> >
> >
> > On Mon, Sep 14, 2009 at 11:15 AM, Mark Stephanus Chandra
> > <mark.chandra_at_gmail.com> wrote:
> > > Dear GS,
> > >
> > >
> > >
> > >
> > >
> > > Have you guys ever experienced that you found traffic in one of your
> > > switchport but there is no mac-address destinate on it.
> > >
> > >
> > >
> > > It happens on my switch , one of the switchport facing to a standby
> > firewall
> > > keep generate traffic, but actually there is no mac-address learn via
> > that
> > > port.
> > >
> > >
> > >
> > > The firewall is netscreen, have any idea what is the possible
> explanation
> > of
> > > this problem ?
> > >
> > >
> > >
> > >
> > >
> > > Regards
> > >
> > > Mark Stephanus Chandra - CCIE#23887
> > > IT Consultant
> > >
> > >
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> >
> >
>
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>
>
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>
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-- 
Regards,
Joe Astorino - CCIE #24347 R&S
Technical Instructor - IPexpert, Inc.
Cell: +1.586.212.6107
Fax: +1.810.454.0130
Mailto:  jastorino_at_ipexpert.com
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