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Device Configuration for VLANs in ATM Networks 2-7
Device
Configuration for
VLANs in ATM
Networks
A Virtual LAN is logical port group spanning a single device or multiple
devices on a network forming a single broadcast or flooding domain.
When LAN Emulation protocols are used to create broadcast domains
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
ATM Switch
Configuration
The CoreBuilder 7000 ATM Switch supports the LAN Emulation Services
(LES/BUS/LECS). Depending on the number of Emulated LANs that need
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.
1 When 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.
2 When 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.