The MIB module to configure LMI and CLLM
on a frame relay ports. This mib module also
contains objects to represent LMI and CLLM
statistics information. The frame relay logical
port is referred to as 'frame relay port' in this
mib. The 'logical port' refers to frame relay
LMI : Local Management Interface.
The Frame Relay LMI is a set of enhancements to
the basic Frame Relay Specification. The Key
Frame Relay LMI extensions include global addressing,
virtual circuit status messages and multicasting.
The LMI includes support for a keepalive mechanism,
which verifies that data is flowing, and a status
mechanism, which provides an on-going status report
on the DLCIs known to the switch.
The LMI Global Addressing extension gives Frame Relay
DLCI values global rather than local significance.
The global addressing extension adds functionality
and manageability to Frame Relay internetworks.
The LMI virtual circuit messages provide communication
and synchronization between Frame Relay DTE and
DCE devices. These messages are periodically report
on the status of PVCs, which prevents data from being
sent into black holes(that, over PVCs that no longer
LMI UNI signaling enables subscribers to find out
about the PVC status of the network, thus inhibiting
the use of an unavailable PVC and supplies procedures
for detecting and modifying following events:
* deletion of a PVC
* addition of a PVC
* availability of a configured PVC
* unavailability of a configured PVC
* error due to LMI message sequencing
ELMI : Enhanced LMI
ELMI allows the router to learn QoS(Quality of
Service) parameters from the switch and use them
for traffic shaping, configuration or management
CLLM : Consolidated Link Layer Management.
The CLLM is an out-of-band mechanism to transport
congestion-related information to the far end.
The CLLM enables the Frame Relay network to more
efficiently relay congestion notifications to the DTE(router).
The CLLM congestion notification is sent on the reserved
data link connection identifier(DLCI) 1023.
Frame Forwarding Port: Frame Forwarding Ports are identified
by portType = frame-forward(3). The signaling parameters
are not applicable to these ports.