Afaik, it's a message about a MAC address in the CAM table shifting to
another port before it has timed out and removed from the CAM table.
3 options possible:
- Duplicate MAC address on the network
- L2 loop (great for broadcast storms)
Loop could exist due to:
- STP error (configuration etc)
- Switch attched with 2 ports (also an STP error)
- Someone with a laptop moving his laptop from one desk to another
Djerk
-----Original Message-----
From: cisc...@puck.nether.net
[mailto:cisc...@puck.nether.net] On Behalf Of Robert Walton
Sent: Wednesday, January 12, 2005 9:55 AM
To: cisc...@puck.nether.net
Subject: [c-nsp] Layer-2 Flapping log messages
Hi,
Just looking at some logs for flapping and wonder what
the difference is between these two logs i.e. is there a
specific meaning behind the specifying of the interfaces
being the opposite way round on the second log entry.
Jan 10 12:07:35.776 GMT: %C4K_EBM-4-HOSTFLAPPING: Host
00:00:5E:00:01:1C in vlan 215 is flapping between port Fa2/48
and port Fa2/3
Jan 10 12:07:41.676 GMT: %C4K_EBM-4-HOSTFLAPPING: Host
00:00:5E:00:01:1C in vlan 215 is flapping between port Fa2/3
and port Fa2/48
cheers,
Rob
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9 messages in net.nether.puck.cisco-nsp[c-nsp] Layer-2 Flapping log messages
