3Com 5000 ATM manual LAN Emulation Operation

LAN Emulation Operation 2-9

LAN Emulation This section describes the simplified operation of a LEC in a LAN

Operationemulation configuration. LEC operation is defined by the protocols of the LAN Emulation User-Network Interface (LUNI).

LUNI protocol defines each stage of operation for a LEC. The major stages of operation, defined in this section, are:

■Initialization

■LECS Connection

■Configuration

■Joining

■BUS Connection

■Data Movement

Initialization In the initial state, the LEC configuration is initialized from nonvolatile storage or set to default values.

The next stage of LEC operation depends on the LANE configuration mode of the LEC:

■Manual configuration mode — The LEC proceeds directly to the Joining stage and uses a locally configured LES ATM address.

■Automatic configuration mode — The LEC proceeds to the LECS Connection stage and attempts to contact the LECS to obtain its configuration, including ELAN/LES assignment.