CISCO-WAN-FR-SIGNALING-MIB

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 port. 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 exist). 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 purposes. 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.