Cabletron Systems CSX1000 - Manual (Page 212)

USER’S GUIDE
212 CyberSWITCH
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 F ORMAT
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 M ESSAGES
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.
L INK I NTEGRITY V ERIFICATION T IMER V ALUE
The number of seconds between sending STATUS_ENQUIRY messages. This parameter is a
component of the LMI.
F ULL S TATUS E NQUIRY P OLLING C OUNT
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.
E RROR T HRESHOLD C OUNT
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.
M ONITORED E VENTS C OUNT
The number of consecutive correct events required to reset an alarm. This parameter is a
component of the LMI.
F RAME R ELAY PVC C ONFIGURATION E LEMENTS
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 V ALUE
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.