LAN Emulation 41
Eliminating Bridge
Loops in ELAN
Configurations
When configuring more than one LEC in a LANplex 2500 or
CoreBuilder 2500 system, a bridge loop may be created. Thi s possibility
exists because the LANplex can b ridge between all ports, including logical
bridge ports (LECs). Because the Spanning Tree Protocol (STP) is off by
default, we recommend following this procedure w hen you create
multiple LECs with Intelligent Switching software:
1After you define all LECs, at the Enable State prompt, enter enable
2Enable STP. From the top level of the Administration Console, enter:
bridge stpState enabled
3Reboot the system.
The system adds the LECs to the bridge table.
Configuring Clients to
Join an Existing
Emulated LAN
You can configure a LAN Emulation Client (LEC) to join an exis ting 802.3
emulated LAN by providing information abou t the LAN Emulation Server
(LES) and the Broadcast and Unknown Server (BUS).
Defining LAN Emulation Clients
When you define a LAN Emulation Client, you give information necessary
for a client to be included in the emulated LAN. A BUS and a LES must
already be defined as part of the emulated LAN before you can define a
client.
When the client attempts to join the emulated LAN, some of the
configured information is carried along with the join request sent to the
LES. The LES can alter this information. The client then has the option of
accepting or rejecting any changes made by the LES. If the changes are
accepted or if there are no changes, the client successfully joins the
emulated LAN. Otherwise, the join fails.
To define a client:
1From the top level of the Administration Conso le, enter:
atm lane define
2Enter the number of the ATM port to which the client is attached.
You can attach only one client per port to the same emulat ed LAN.