hi :

i am new to GN3, i had three 3600 routers with NM-16ESW module installed. when i checked mac addresses of three devices, all mac addresses of ports were the same, was it normal ?

i.e
Sw1#show int f1/1
FastEthernet1/1 is up, line protocol is up
Hardware is Fast Ethernet, address is cc00.0de0.f101 (bia cc00.0de0.f101)
Sw3#show int f1/1
FastEthernet1/1 is up, line protocol is up
Hardware is Fast Ethernet, address is cc03.0de0.f101 (bia cc03.0de0.f101)

f1/1 on both switchs share the same mac. why is that ?
isn't mac supposed to be unique?

see again your mac-address, they are really different !

_________________
Mario
Network Admin

CCNA certified.
Cisco SNAF courses studied (Securing Networks With ASA Foundation)
Cisco CCNP route courses in April 2012.