Cabletron Systems Smart 04-0053-01 - Manual (Page 21)

SmartSwitch ATM User Guide 2-3
IP Over ATM and LANE Creating an IP over ATM VLAN
Note If configured devices fail to join the VLAN, see Chapter 4, "Routing." Section 4.3.
Also, see Chapter 9, "Troubleshooting."
2.1.1 Default ATM Addressing for IP over ATM
ATM SmartSwitches provide a default format for ATM addresses used by IP over ATM.
Note SmartSwitch 2500 family ATM switches and SmartSwitch 6500 switches use
different methods for producing the default netprefix.
Default Netprefix for SmartSwitch 2500 Family Switches
The default netprefix is constructed from
39 + nine zero bytes + last three bytes of CPU MAC address
For example, if the chassis MAC address = 00:20:D4:14:41:80 , then
Default netprefix = 39:00:00:00:00:00:00:00:00:00:14:41:80
Default Netprefix for SmartSwitch 6500
The default netprefix is constructed from
39 + nine zero bytes + last three bytes of chassis MAC address
For example, if the chassis MAC address = 00:00:1D:80:A3:34 , then
Default netprefix = 39:00:00:00:00:00:00:00:00:00:80:A3:34
Default IP Over ATM Local Client Address
The default Local client address is constructed from
netprefix + two zero bytes + client IP address (in hexadecimal) + trailing zero byte
For example
netprefix = 39:00:00:00:00:00:00:00:00:00:A3:87:0B
chassis MAC address = 00:00:1D:A3:87:0B
client IP address = 90.1.1.1 (5A.01.01.01 in hexadecimal)
then,
IP over ATM client address = 39:00:00:00:00:00:00:00:00:00:A3:87:0B:00:00:5A:01:01:01:00