Cabletron Systems 6A000 User Manual

SmartCell 6A000 User Guide   3-3

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If configured devices fail to join the VLAN, see Chapter 4, Section 4.2.2, “UNI 
Routes.” Also, see Chapter 5, Section 5.1, “Troubleshooting IP Over ATM.”

You have completed the process for creating an IP over ATM VLAN. Continue to the next section for instructions on 
creating an emulated LAN or go to Chapter 4, “Switch Administration,” for information about SmartCell 6A000 
switch operations and maintenance.

3.1.1

ATM Addressing for IP over ATM

The SmartCell 6A000 provides a default format for ATM addresses used by IP over ATM. The default format is 
constructed as follows:

netprefix + two zero bytes + IP address of the device (in hex) + a trailing zero byte

Where the netprefix is constructed from

39 + nine zero bytes + the last three bytes of the device’s MAC address

For instance, if the switch’s MAC address is 

00:20:D4:14:41:80 and 

the switch’s client IP address is 

90.1.1.1, 

then 

the 

20

-byte ATM address of the ARP server is

Where

 = netprefix

 = two trailing zeros

 = IP address 90.1.1.1 in hexadecimal

00 = trailing zeros byte

3.2

CREATING AN EMULATED LAN

This section describes the steps for implementing an Ethernet Emulated LAN (ELAN) on your SmartCell 6A000 
switch. The following assumptions are made:

The SmartCell 6A000 switch will contain a client on the ELAN.

All end nodes (computers, edge devices, other switches, and so on) support the Well Known LECS 
Address or can obtain the address of the LECS using ILMI.

All end nodes support Switched Virtual Circuits (SVCs).

An ELAN comes pre-configured on SmartCell 6A000 switches. The ELAN name 
is “ELAN000.” To use this ELAN, start the LECS, configure your end nodes and 
edge devices to use this ELAN000, and then plug them into the SmartCell 6A000.