I've my BCM450 with IP address 192.168.150.45 and it's connected to the network by a LAN port, not by the OAM port.
If anyone on the network tries to get 10.10.11.1, the BCM450 will interfere, obviously using its LAN port.
The LAN port has a MAC address ending in 27.
The OAM port has a MAC address ending in 28.
When I check the ARP cache on my PC, 10.10.11.1 is in the list, with the MAC address ending in 27.
Clearly the BCM is answering ARP when it should not be. This is a problem.
Nortel should have have a means to change the OAM address just like it does for the BCM50.
It causes me problems (as well as causing bwinatick a problem) that this feature is not included.