Hi
The message you see on the cat4000 means that the catalyst saw a frame with
a null source MAC address and informs you that it will not learn that MAC
address and thus not add it into the CAM table.
These messages are not displayed on cat5000 because the necessary code for
displaying them is not there.
Possible causes for having a NULL mac address: a smartbit sending such
frames, a router or station which MAC address has been modified or sometimes
other vendor switches use such null MAC address as source MAC address (3Com
for instance).
If none of the above causes apply to your network, the only ways to remove
these messages are:
1) use a sniffer to find out which machine is sending such frames
2) change the logging level so the messages are not displayed anymore. This
only clears the logging but does not resolve the exact problem (it only
masks it).
You can change the logging level by using the following command:
set logging level sys 3
Regards,
/Stuart
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| | Stuart Potts
||| ||| Customer Support Engineer
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c i s c o S y s t e m s Email: [EMAIL PROTECTED]
"Empowering the Internet Generation"
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-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Lim Kok Hua
Sent: Wednesday, February 14, 2001 9:47 AM
To: [EMAIL PROTECTED]
Subject: Log message from Cat4006
Hi
Anyone can advise on the following message from a Cat 4006 switch ?
%SYS-4-P2_WARN: 1/Filtering Ethernet MAC address of value zero from agent
host table interface
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