Cabletron Systems ZX-250 사용자 설명서

SmartCell ZX-250 User Guide   3-3

IP Over ATM and LANE

Creating an Emulated LAN  

2p›F

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 ZX-250 
switch operations and maintenance.

3.1.1

ATM Addressing for IP over ATM

The SmartCell ZX-250 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 ZX-250 
switch. The following assumptions are made:

U

The SmartCell ZX-250 switch will contain a client on the ELAN.

U

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.

U

All end nodes support Switched Virtual Circuits (SVCs).

2p›F

An ELAN comes pre-configured on SmartCell ZX-250 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 
ZX-250.