Cabletron Systems CSX1000 Lmi, LMI Format, Frame Relay PVC Configuration Elements, Dlci Value

USER’S GUIDE

LMI

Indicates whether or not this frame relay access will support the Local Management Interface (LMI). If this frame relay access supports LMI, LMI information can be displayed by entering the fr lmi command at the system console prompt. For further LMI information, refer to the Local Management Interface Overview.

LMI FORMAT

The LMI format used by this frame relay access. Available formats include ANSI, and CCITT. The recommended LMI format is CCITT. If this format is unavailable, use ANSI.

CLLM MESSAGES

Indicates whether or not this frame relay access will support Consolidated Link Layer Management (CLLM) messages. CLLM is recommended for systems in Japan. CLLM must be requested from your carrier service. The CLLM message is based on the standard Layer 2 XID frame used for the exchange of functional information. If this frame relay access supports CLLM messages, any of these messages that are sent across the network will be included in the system log messages. To access the system log message, enter the dr command at the system console prompt.

LINK INTEGRITY VERIFICATION TIMER VALUE

The number of seconds between sending STATUS_ENQUIRY messages. This parameter is a component of the LMI.

FULL STATUS ENQUIRY POLLING COUNT

The number of intervals to elapse before sending a full report STATUS_ENQUIRY message. The length of each interval is equal to the value of the configured Link Integrity Verification Timer. This parameter is a component of the LMI.

ERROR THRESHOLD COUNT

The number of errors in the last “n” events required to declare an alarm. When an alarm is declared, a system message will be logged stating that the alarm is now on. To access system log messages, enter the dr command at the system console prompt. The number of events (“n”) is equal to the value of the configured Full Status Enquiry Polling Count. This parameter is a component of the LMI.

MONITORED EVENTS COUNT

The number of consecutive correct events required to reset an alarm. This parameter is a component of the LMI.

FRAME RELAY PVC CONFIGURATION ELEMENTS

Once the above frame relay parameters have been configured, the associated PVCs should be configured. A frame relay access may have multiple PVCs, within this limit: the aggregate bandwidth of all associated PVCs cannot exceed the bandwidth of the frame relay access.

DLCI VALUE

Each data frame to be transmitted by an endpoint is identified by a Data Link Connection Identifier (DLCI). The DLCI is supplied by the service provider at subscription time. It is a unique identifier for that PVC. The DLCI identifies a pre-established path, or permanent virtual circuit, within the access line to the frame relay network. The frame relay switch at the edge of the frame relay network, the one to which the access line is directly connected, routes the packet to the intended destination based on the DLCI therein. Hence, each packet is routed independently through the network based on the addressing information provided by this identifier.

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