IBM SG24-4817-00 manual Configuring LAN Emulation, 1 8285 LAN Emulation Functions Overview

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Table 34 (Page 2 of 2).	IX Status Messages and Causes
IX Status Message		Possible Causes	Suggestions
ACN mismatch		Each switch has a	•	Change the ATM
		different ATM cluster		address of one of the
		number.		switches so that both
				have the same
				cluster number.
			•	Set each end of the
				link to use NNI
				protocols if
				connecting different
				clusters.

That is basically all that is required to configure a simple ATM CIP network.

7.2 Configuring LAN Emulation

The IBM 8285 Control Point can provide the Forum-Compliant LAN Emulation server functions (LES/BUS) and the client (LEC) function. To enable these functions on the 8285 ATM Control Point, it is necessary to configure and enable LAN Emulation on it.

7.2.1 8285 LAN Emulation Functions Overview

The IBM 8285 Control Point can provide the Forum-Compliant LAN Emulation server functions (LES/BUS) and the client (LEC) function. It supports up to two LES/BUSe simultaneously with any combinations of ELAN types, such as two token-ring ELANs (TR/LEs), two Ethernet ELANs (ETH/LEs), and one TR/LE and one ETH/LE. In addition, it supports both TR and ETH LECs simultaneously but it cannot have two LECs with the same ELAN type.

7.2.2 LAN Emulation Parameters

The only parameters you will need in order to configure LAN Emulation functions are:

•ATM Address

This is the 20-byte ATM address to be assigned to the switch′s LEC and LES/BUS components as well as its to CIP interface. This address is comprised of five basic parts:

1.ATM network prefix (bytes 1-11)

2.ATM cluster number (ACN) (byte 12)

3.ATM hub number (HN) (byte 13)

4.End station identifier (ESI) (bytes 14-19)

5.ATM selector field (SEL) (byte 20)

In the IBM 8285 there is only one command, SET DEVICE ATM_ADDRESS, to define the ATM address and it is to configure the ATM address for the CIP interface. The addresses of LAN Emulation components are automatically assigned based on the CIP interface address by changing the selector field of it. Table 35 on page 132 shows the Forum-Compliant LAN Emulation addresses are assigned.

Chapter 7. IBM 8285 Configuration 131