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Re: Port-security on the switch interesting question.. posted 02/16/2007
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Do you thing so?? What are GARP packets?? What are the used for. Hear for the first time about this protoocol. As far as I have googled it is relative to multicast. I do not have any multicast configured.

Thoughts?


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.
>
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