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12-18 Cisco BPX 8600 Series Reference
Management
Connection Management
The NNI cell format has 12 bits for the VPI, so addcon allows specification of VPI 0-4095 on NNI
ports.
Signaling
System software supports the following LMI/ILMI signaling actions:
• Internal network failure: software informs LMI/ILMI to set A bit = 0 for failed connections.
Software informs ASI-1 to transmit AIS to port for failed connections.
• Port failure/LMI Comm Failure: software informs remote nodes terminating all affected
connections. Remote node BCC informs LMI/ILMI to set A bit = 0, and ASI-1 to transmit AIS.
• LMI A = 0: software polls ILMI agent periodically for A-bit status. Status changes are reflected
in the ‘dspcon’ screen.
Alarms
LMI communication failure on an ASI-1 causes declaration of a minor alarm. The dspport screen
shows the failure, as does the dspalms screen.
A-bit = 0 on an NNI port causes declaration of a minor alarm. The dspcon, dspcons, and dspalms
screens show this failure.