Switchport sticky question.

why does the sticky parameter give an option for a mac address ?
sticky just learns the first mac on the interface, so why is a mac
option given ?

from PT:

Switch(config-if)#switchport port-security mac-address sticky ?

H.H.H 48 bit mac address

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Comments

Hondabuff

I think its an error. I just checked a 3750, 2960 and 3850 and they don't have the option. No one I can recall uses the sticky feature anyway. We do mac filtering per port at some locations but they are always manually entered. Most big Corporations will be using Cisco ISE with dot1x per port and authenticating against LDAP or Radius for their workstations and PC's

rob42

I have two C2950 switches; I'll call them S1 and S2.

S1 does not have the 'sticky' option. The 'show ver' command output is...
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(6)EA2c, RELEASE SOFTWARE (fc1)

But, S2 does have the 'sticky' option. The 'show ver' command output is...
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA6, RELEASE SOFTWARE (fc1)

As for why you have the option to enter a MAC Address at this point, the only reason that I can think of is if you want to use the 'protect' option with 'switchport port-security violation', as this mode will only work with the 'sticky' option.