Nortel 450-24t 用户指南

BayStack 450 10/100/1000 Series Switches

309978-D Rev 01

1-31

The BayStack 450 switch has a unique 48-bit hardware address, or MAC address, 
that is printed on a label on the back panel. You use this MAC address when you 
configure the network BootP server to recognize the BayStack 450 switch BootP 
requests. A properly configured BootP server enables the switch to automatically 
learn its assigned IP address, subnet mask, IP address of the default router (default 
gateway), and software image file name.

When the switch is participating in a stack configuration, a Stack MAC address is 
assigned automatically during the stack initialization. The base unit’s MAC 
address, with an offset, is used for the Stack MAC address.

For example, if the base unit’s MAC address is:

00-00-82-99-44-00

and the offset is:

1F

then the Stack MAC address becomes:

00-00-82-99-44-1F

If another unit in the stack is assigned as the base unit, the MAC address of the 
new base unit (with offset) now applies to the stack configuration. The original 
stack IP address still applies to the new base unit.

For an example of a BootP configuration file, see Appendix H, “Sample BootP 
Configuration File.”

BayStack 450 switches are autosensing and autonegotiating devices. The term 
autosense refers to a port’s ability to sense the speed of an attached device. The 
term autonegotiation refers to a standardized protocol (IEEE 802.3u) that exists 
between two IEEE 802.3u-capable devices.

Autonegotiation allows the BayStack 450 switch to select the best of both speed 
and duplex modes.