Lmi (Local Management Interface) - HP auroraTempo User Manual

Introduction to Frame Relay

LMI (Local Management Interface)

The LMI was conceived by the standards bodies as an
optional enhancement to the basic Frame Relay protocol.
The LMI uses special management frames to monitor the
status of the link and provide information on the PVCs and
the Frame Relay interface. These frames, which have a
unique DLCI address of zero (ANSI and CCITT) or 1023
(FRF), are passed between the network and the access
device.
The LMI protocol conforms to all the standard Frame Relay
rules concerning frame structure and protocol but, with
LMI, there are extensions to the frame structure. The
following diagram shows the LMI frame:
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