Cabletron Systems ZX-250 manual Creating AN Emulated LAN, ATM Addressing for IP over ATM

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.

3.1.1ATM 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

39:00:00:00:00:00:00:00:00:00:14:41:80:00:00:5A:01:01:01:00

Where 39:00:00:00:00:00:00:00:00:00:14:41:80 = netprefix 00:00 = two trailing zeros

5A:01:01:01 = IP address 90.1.1.1 in hexadecimal 00 = trailing zeros byte

3.2CREATING 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:

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

UAll 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.

UAll 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.

SmartCell ZX-250 User Guide 3-3