Cabletron Systems 04-0053-01 User Manual

SmartSwitch ATM User Guide   2-3

IP Over ATM and LANE

Creating an IP over ATM VLAN  

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.

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 

 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 

 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 

 

 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