Information Technology Reference
In-Depth Information
Address Registration via ILMI
The LEC first registers its ATM address with the ATM network.
LEC ATM0.1: action A_REGISTER_ADDR
LEC ATM0.1: predicate PRED_LEC_NSAP TRUE
LEC ATM0.1: state IDLE event LEC_LOCAL_ACTIVATE => REGISTER_ADDR
LEC ATM0.1: action A_POST_LISTEN
LEC ATM0.1: sending LISTEN
LEC ATM0.1: listen on 47.00918100000000603E899601.00E01E2EE8B0.01
LEC ATM0.1: state REGISTER_ADDR event LEC_CTL_ILMI_SET_RSP_POS => POSTING_LISTEN
LEC ATM0.1: received LISTEN
LEC ATM0.1: action A_ACTIVATE_LEC
LEC ATM0.1: predicate PRED_CTL_DIRECT_NSAP FALSE
LEC ATM0.1: predicate PRED_LECS_NSAP FALSE
LEC ATM0.1: state POSTING_LISTEN event LEC_SIG_LISTEN_POS => GET_LECS_ADDR
LEC ATM0.1: action A_ALLOC_LECS_ADDR
LEC ATM0.1: state GET_LECS_ADDR event LEC_CTL_ILMI_SET_RSP_POS => GET_LECS_ADDR
Connecting to LECS (Configure Direct)
The LEC sets up a connection to LECS (bidirectional point-to-point VC) to find the ATM address of the
LES for its ELAN. When this is done, this VC to the LECS is released.
The LEC finds the LECS ATM address by using three methods, in this order:
1.
Using hard-coded ATM address
2.
Getting the LECS via ILMI VPI=0, VCI=16 (not supported by some vendors)
3.
Fixing the address defined by the ATM Forum:
(47.007900000000000000000000.00A03E000001.00)
Using the same VCC, the LECS returns the ATM address of the LES for the LEC ELAN.
