
Understanding ATM, MPOA, ATM Router Redundancy, and OAM
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The following sections briefly describe each LAN emulation state. Refer to the
ATM Forum LAN Emulation Over ATM specification for more information about
LAN emulation states.
Initial State
An LE client always starts in the initial state before attempting to connect to the
LECS.
LECS Connect State
An LE client enters the LECS connect state when it attempts to connect to the
LECS.
Configure State
An LE client enters the configure state when it attempts to retrieve the necessary
information (that is, the ATM address of the LES, LAN type, LAN name,
Maximum MTU, and various timeout values) required to join an emulated LAN.
Join State
An LE client enters the join state when it attempts to join an emulated LAN.
Joining an emulated LAN requires that the LE client:
• Set up a control VCC to communicate with the LES.
• Send a join request (containing the client MAC address) to the LES.
• Accept a control distributed VCC to receive control data from the LES.
• Receive a valid join response from the LES containing a LAN emulation
client ID (LECID).
Note:
Only one ATM LE client per Bay Networks ATM router can join an
emulated LAN at any point in time. However, you can always move a LAN
emulation client to the appropriate emulated LAN using network management
software.
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