Sticky vs static mac addr on 3550 ports

From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Oct 01 2003 - 18:53:34 GMT-3

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Hi everybody,

I came across this while reviewing port security for the 3550. Here's the
link:

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12114ea1/3550scg/sw
trafc.htm#1038501

In that section, I saw 2 commands:

switchport port-security mac-address [mac-address [vlan vlan-id]]

switchport port-security mac-address sticky [mac-address [vlan vlan-id]]

Here's my question: Why would the optional mac addr ever be added after using
the sticky keyword?

If you wanted to add a mac addr, wouldn't you use the 1st command and if you
wanted the switch to dynamically learn mac addresses, wouldn't you use the 2nd
command without specifying a mac addr?

This doesn't make any sense to me. Can someone explain this?

Thanks, dt

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