'sh mac' oddity

From: Mike Williams (ccie2be@swbell.net)
Date: Tue Jun 17 2003 - 12:29:19 GMT-3

This is strange....... I realize that ffff.ffff.ffff is the broadcast
MAC. And this is the first time I've seen this. But, I'm on a 4507 Sup
IV (running IOS), and when I do a show mac on a particular Port-Channel
interface, I get this:

HQ7#sh mac int po30
Unicast Entries
 vlan mac address type protocols port
-------+---------------+--------+---------------------+----------------- 

---
   1    0009.6b00.9db5   dynamic ip                     Port-channel30

Multicast Entries
 vlan    mac address     type    ports
-------+---------------+-------+----------------------------------------
---
   1    ffff.ffff.ffff   system
Switch,Gi3/1,Gi3/2,Gi3/8,Gi3/10,Gi3/11,Gi3/17
 
Gi3/24,Gi3/25,Gi3/27,Gi3/29,Gi3/31,Gi3/32
 
Gi3/37,Gi3/47,Gi4/3,Gi4/4,Gi4/6,Gi4/9,Gi4/10
 
Gi4/11,Gi4/13,Gi4/17,Gi4/20,Gi4/21,Gi4/23
 
Gi5/1,Gi5/2,Gi5/3,Gi5/5,Gi5/7,Gi5/8,Gi5/9
 
Gi5/10,Gi5/11,Gi5/12,Gi5/13,Gi5/14,Gi5/15
 
Gi5/25,Gi5/27,Gi5/28,Gi5/29,Gi5/30,Gi5/31
 
Gi5/32,Gi5/34,Gi5/35,Gi5/36,Gi5/37,Gi5/38
 
Gi5/39,Gi5/40,Gi6/1,Gi6/3,Gi6/12,Gi6/14,Gi6/17
 
Gi6/18,Gi6/19,Gi6/21,Gi6/23,Gi6/25,Gi6/33
 
Gi6/35,Gi6/39,Gi7/1,Gi7/2,Gi7/4,Gi7/13,Po4
                                Po30

Why is it showing ffff.ffff.ffff on the show mac for this interface?
I've never noticed this until today, and I'm working on connecting our
Cisco switches to an IBM blade server (that has it's own built-in 4-port
switch) and I want to make sure this entry didn't come about because of
that (which is where I first noticed it).

Any clues or suggestions?

Thanks!
Mike W.

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