From: "Jian Gu" <guxiaojian@xxxxxxxxx>
Reply-To: "Jian Gu" <guxiaojian@xxxxxxxxx>
To: "Stefan Grey" <examplebrain@xxxxxxxxxxx>
CC: ccielab@xxxxxxxxxxxxxx
Subject: Re: Port-security on the switch interesting question..
Date: Fri, 16 Feb 2007 08:13:01 -0800
I guess when you change MAC address of router, the router will send out
GARP
packets.
On 2/16/07, Stefan Grey <examplebrain@xxxxxxxxxxx> wrote:
>
> Well guys when I configured this on the switch I have mentioned the
> strange
> thing. Maybe you could test this... or tell why the following heppens??
>
> PC--- Switchfa0/1 - fa0/0-router.
>
> on the switch fa0/1 interface is configured:
> switchport mode acc
> sw port-security
> sw port-security maximum-mac 1.
> sw port-security violate shutdown
>
> Than although I didn't do anything the mac address entry for fa0/0
> interface
> of the router appears in the CAM table of the router. I change the Mac
on
> the interface of the router... the interface of the switch goes in the
> shutdown mode. I just wonder how the switch makes the entries in its CAM
> table?? NO packets are sent through the network. Well I thought maybe
its
> due CDP frames.. but I disabled it and the behaviour is still the same.
> How
> does the switch make an entry for the router in its CAM table?? (Are
there
> any frames inbetween excep CDP about which I don't know??)
>
> Any thoughts??
>
> Thanks.
>
> _________________________________________________________________
> Customise your home page with RSS feeds at MSN Ireland!
http://ie.msn.com/
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
_______________________________________________________________________
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
