The answer is always in the release notes.  :-)  (Looks like you were
right on Ryan)

http://www.cisco.com/en/US/products/ps6128/prod_release_note09186a008053
a3ed.html#wp140796

When the Cisco Catalyst Express 500 Series (CE500) is added to the Clean
Access Manager as a managed switch, it will use linkup/linkdown SNMP
trap notification by default. With release 3.6(2) and above, the CE500
can be configured to use mac-notification traps using the Advanced
configuration page for the switch (under Switch Management > Devices >
List > Config [Switch IP] > Config > Advanced). Note that the switch
ports of the CE500 must be assigned to the OTHER role (not Desktop or IP
phone) on the switch's Smartports configuration, otherwise,
mac-notification will not be sent out. See also Supported Switches for
Cisco Clean Access Out-of-Band (OOB).


> -----Original Message-----
> From: Perfigo SecureSmart and CleanMachines Discussion List 
> [mailto:[log in to unmask]] On Behalf Of Ryan Dorman
> Sent: Friday, March 31, 2006 9:10 AM
> To: [log in to unmask]
> Subject: Re: OOB
> 
> Of course Rajesh should be the one to comment on this.. But 
> I'm sitting here and I'm going to take a stab at it.
> 
> My understanding is that an SNMP trap with a "new MAC" 
> notification is set.
> 
> Anyone wanna smack me for taking a stupid guess?
> --
> Ryan Dorman, CCNP
> Network Engineering Specialist
> Millersville University
> 717.871.5883
> 
>