Cabletron Systems 04-0053-01 manual Default ATM Addressing for IP over ATM

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."

2.1.1Default 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

SmartSwitch ATM User Guide 2-3