Avaya M-ACCF/SF manual Emulated LAN Connections, Control VCCs

Chapter 1 Overview

Emulated LAN Connections

LECs and LESs communicate with each other by means of ATM virtual channel connections (VCCs). Control signals and data transmissions are handled by separate VCCs: Control VCCs and Data VCCs.

Figure 1.1 Basic LAN Emulation Client Connections

Control VCCs

The control VCCs carry control traffic such as LE_ARP requests and responses. On initialization, control VCCs are established between LEC and LES (bi-directional control-directVCC and control-distributeVCC) as well as a bi-directional configuration VCC between LEC and LECS. Characteristics of the control VCCs are summarized in Table 1.1.

Table 1.1	Control VCCs
VCC Name		From/To	Information carried	Initialized	Duration
				by
Configuration		LEC<==>LECS	LEC requests and	LEC	While
			receives		needed
			configuration
			information from
			LECS, including LES
			address
Control-direct		LEC<==>LES	LEC sends and	LEC	Membership
			receives controls		of LEC in
			from LES, including		ELAN
			LE_ARP information

Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide 5