Mac Address is changing

Dear All.

I am facing one issue. i have 2 switches connect together.

SW1 F0/35 -------------------------- SW2 F1/0/1
in switch sw1 one i have a vlan access list

***********************
!
 mac access-list extended allow_all
 permit any any
!
 mac access-list extended block_MAC
 permit host 001f.2791.dc83 any
!
 vlan access-map block_MAC 100
 action drop
 match mac address block_MAC
vlan access-map block_MAC 200
 action forward
 match mac address allow_all
!
vlan filter block_MAC vlan-list 100
******************************
this vlan access is not working i am trying to block the mac address of SW2
F1/0/1 but what i am seeing that SW2 mac address is changing in
SW2.
SW2:
interface FastEthernet1/0/1
 no switchport
 ip address 11.1.1.5 255.255.255.0
end

 see below
Sw2#sh int f1/0/1
FastEthernet1/0/1 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001f.2791.dc83 (bia 001f.2791.dc83)
 Sw2#sh int f1/0/1 | i bia
  Hardware is Fast Ethernet, address is 001f.2791.dcc1 (bia 001f.2791.dcc1)

when i plug the cable to sw2 port fa1/0/3 it show me the same mac address
001f.2791.dcc1 and then i checked the mac addess of a sw2 f1/0/3it shows me
001f.2791.dc83. but when i plug the cable back to the f1/0/1 it show me the
001f.2791.dcc1 the mac address is changing on the port.

Sw2#sh int f1/0/1
FastEthernet1/0/1 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001f.2791.dc83 (bia 001f.2791.dc83)
 Sw2#sh int f1/0/1 | i bia
  Hardware is Fast Ethernet, address is 001f.2791.dcc1 (bia 001f.2791.dcc1)

why this is happening ???? any idea

"c3750-ipservicesk9-mz.122-50.SE1"

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Received on Mon Aug 15 2011 - 03:06:26 ART