Multicast address on nonexistent port

[jah3000]

I keep getting this message: %SYS-4-P2_WARN: 4/Invalid traffic from multicast source address 91:3a:83:24:39:1a on port 4/59. But I can't find this MAC address anywhere, and module 4 is a gig module with only 9 ports. Anybody have any ideas on how to handle this?

 

[l1carter]

turn down your logging level

 

[oj88]

It coulld be a virtual mac-address. This is typically used when some form of ethernet redundancy exists (ie. Cisco's HSRP or possibly by one of the servers with multiple ethernet connection to the same switch but is not running etherchannel)... teaming, perhaps?

Orlando Palomar Jr
CCIE# 11206, CCNP
CIPT Operations Specialist
Phil-Data Business Systems, Inc.

 

[jah3000]

oj88,

have you ever heard of a port showing up that was not a physical port? is this another characteristic of redundancy?