Cabletron Systems 04-0053-01 Switch Clients, Distributed Lane Services, Just for this example

IP Over ATM and LANE Creating an Emulated LAN

2.2.3Switch Clients

It is important to understand the concept of ATM SmartSwitch client connections. A switch client connection is actually a VLAN connection to the ATM SmartSwitch’s CPU (Here, we use the term VLAN to mean any type of “virtual LAN,” whether LANE or IP over ATM.). This CPU connection appears as if the switch is an end station on the virtual LAN. The ATM SmartSwitch uses local clients to connect itself to the VLANs that it supports.

This is analogous to a phone company that supports a communication system. Even though the phone company maintains the circuits, a call to the phone company itself cannot be made unless the phone company has its own number and connection on its own phone system. Similarly, VLAN membership (and the reachability) of an ATM SmartSwitch on any particular VLAN depends upon whether the ATM SmartSwitch has a local client connection for that VLAN.

Clients are created using the command add laneclient for LAN emulation, and add ipatmclient for IP over ATM.

For example, the following command adds a switch client to the ELAN elan1:

SmartSwitch# add laneclient
ClientNumber(0)	: 1
LanName(ELAN001)	: elan1
ServerType(LECS)	:
ServerAddress()	:
IPAddress()	: 90.1.1.45	— Just for this example
NetMask(255.255.0.0)	:255.255.255.0 — Just for this example
MTU(1516)	:
SmartSwitch#

Prior to creating this local client connection, end devices could communicate with each other through elan1, but they could not communicate with the SmartSwitch ATM switch, itself.

2.2.4Distributed LANE Services

LANE services (LECS, LES, and BUS) can reside on different ATM SmartSwitches. For example, the LECS can reside on one ATM SmartSwitch, while the LES and BUS reside on another. Use the add lecselan, add leselan, and add buselan to distribute LANE services among ATM SmartSwitches.

The following steps create an ELAN with the LECS on switch SW1 and the LES and BUS on switch SW2.

1.Use the add buselan command to create the BUS on switch SW2:

SW2 # add buselan
ELANNumber(0)	: 1	— We’ll use ELAN number = 1 throughout the example
ELANName(ELAN001)	: mis1	— We’ll call the ELAN “mis1” throughout the example
ConnectMethod(SVC)	:
ELANType(802.3)	:
Multipoint(YES)	:
MTU(1516)	:
ErrorLogEnable(NO)	:
MinimumTDEnable(NO)	:
SW2 #

SmartSwitch ATM User Guide 2-9