3Com 4.2.2 manual Device, Configuration for, VLANs in ATM, Networks

Device Configuration for VLANs in ATM Networks 2-7

Device	A Virtual LAN is logical port group spanning a single device or multiple
Configuration for	devices on a network forming a single broadcast or flooding domain.
VLANs in ATM	When LAN Emulation protocols are used to create broadcast domains
Networks	over ATM-based infrastructures, these broadcast domains are also
	commonly known as Emulated LANs or ELANs. Each Emulated LAN is
	serviced by a single LES (LAN Emulation Server) and single BUS (Broadcast
	Unknown Server). Endstations or network devices that join a common
	Emulated LAN are said to be in a single ELAN or VLAN. These endstations
	communicate with the LAN Emulation Services (LES/BUS) via another LAN
	Emulation entity called a LAN Emulation Client (LEC).
	To build and manage ATM/LAN Emulation-based Virtual LANs, the LAN
	Emulation Services and Clients must first be manually configured into
	their respective default states via device consoles or a local management
	interface. Only after they are configured, can you use the ATM and VLAN
	Management application to manage and manipulate the environment.
CoreBuilder 7000	The CoreBuilder 7000 ATM Switch supports the LAN Emulation Services
ATM Switch	(LES/BUS/LECS). Depending on the number of Emulated LANs that need
Configuration	to be created, LANE services must be enabled on one or more
	CoreBuilder 7000 switches in the network. You can use the CB7000 Fast
	Setup tool to configure the CB7000 through the ATMvLAN Toolbar. See
	“The CB7000 Fast Setup Tool” on page 2-8.
	The following guidelines should be followed when enabling LAN
	Emulation Services on the CoreBuilder 7000.

1When there are multiple CoreBuilder 7000s, the LAN Emulation Services must be distributed amongst all the core switches.

For example, if 10 Emulated LANS are required and the network is comprised of 5 CoreBuilder 7000s in the core of the network, you should distribute the LANE Services on all the core switches.

All LANE services should be enabled on all the core switches. Since each CoreBuilder 7000 supports 16 LES/BUS pairs, some of these LES/BUS pairs may be configured as primary LANE servers of an ELAN and the others as backup LANE Servers for the primary LES/BUS pair. See Chapter 4.

2When there are multiple CoreBuilder 7000s, the LAN Emulation Configuration Server (LECS) may be enabled on multiple switches. Up to 5 LECSs may be configured as active LECSs in the network. You should enable LECSs on some of the core switches in the network.