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Weird MAC behaviour

Unanswered Question
Oct 23rd, 2002
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There are PC A and PC B. PC A has an IP address reserved in DHCP. PC A was switched on and after some work was done user switched it off. PC B is configured with a static IP address belonging to PC A (by accident). It is left switched on. When PC A is switched on, port security is activated and the port is shutdown. The port reported that the MAC address of PC B was found.


Does anyone knows what is going on?

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pltang Sun, 10/27/2002 - 16:11
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I still do not understand.

Whose arp cache is corrupted? The switch does not have any arp entries on PC A and PC B. Port security is only activated when the illegal MAC is seen from the port. So how did the illegal MAC end up there?


TIA.


t.baranski Mon, 10/28/2002 - 19:23
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Can't think of a logical reason for this as I don't see why port security would pay any attention to layer 3 addresses. Might be a bug in whatever IOS/CatOS version you're using.

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