BayStack 450 10/100/1000 Series Switches309978-D Rev 01 1-31BootP Automatic IP Configuration/MAC AddressThe 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 youconfigure the network BootP server to recognize the BayStack 450 switch BootPrequests. A properly configured BootP server enables the switch to automaticallylearn its assigned IP address, subnet mask, IP address of the default router (defaultgateway), and software image file name.When the switch is participating in a stack configuration, a Stack MAC address isassigned automatically during the stack initialization. The base unit’s MACaddress, with an offset, is used for the Stack MAC address.For example, if the base unit’s MAC address is:00-00-82-99-44-00and the offset is:1Fthen the Stack MAC address becomes:00-00-82-99-44-1FIf another unit in the stack is assigned as the base unit, the MAC address of thenew base unit (with offset) now applies to the stack configuration. The originalstack IP address still applies to the new base unit.For an example of a BootP configuration file, see Appendix H, “Sample BootPConfiguration File.”Autosensing and AutonegotiationBayStack 450 switches are autosensing and autonegotiating devices. The termautosense refers to a port’s ability to sense the speed of an attached device. Theterm autonegotiation refers to a standardized protocol (IEEE 802.3u) that existsbetween two IEEE 802.3u-capable devices.Autonegotiation allows the BayStack 450 switch to select the best of both speedand duplex modes.
