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Configure Frame Relay 249
The following table describes the value ranges and default values of related
parameters of the Frame Relay LMI protocol
Table 278 Descriptions of related parameters of Frame Relay LMI protocol
In which, the related parameters at the DTE side include:
■ T391DTE: The interval of the link integrity polling for the equipment at the DTE
side
■ N391DTE: DTE equipment will send a status enquiry message at a certain
interval (which is determined by T391). The status enquiry messages are divided
into two types: link integrity authentication messages and link status enquiry
messages. The parameter N391DTE is used to define the sending ratio of these
two types of messages. That is:
Number of link integrity authentication messages: Number of link status enquiry
messages = N391-1: 1
■ N392DTE: The threshold for the errors that can occur in the total number of
observed events at the DTE side.
■ N393DTE: The total number of observed events at the DTE side.
DTE equipment will send a status enquiry message at a certain interval (which is
determined by T391) to inquire the link status. Upon receiving that message, the
DCE equipment sends the status response message promptly. If the DTE
equipment does not receive the response in the specified time, the error will be
recorded. If the number of errors exceeds the threshold, the DTE equipment will
regard the physical path and all the virtual circuits as unusable. The parameters
N392 and N393 together define the “error threshold”. That is, if the number of
errors in the N393 status enquiry messages sent by the DTE equipment reaches
Restore the default value of the LMI event
counter
undo fr lmi n393dce
Set the link integrity polling timer at the user side
(T391 DTE)
fr lmi t391dte [ t391-value ]
Restore the default value of the link integrity
polling timer at the user side
undo fr lmi t391dte
Set the polling timer at the network side (T392
DCE)
fr lmi t392dce [ t392-value ]
Restore the default value of the polling timer at
the network side
undo fr lmi t392dce
Operation
mode
Parameter description Value range Default value
DTE Link integrity polling timer (T391)
When T391 = 0, it indicates that the
LMI protocol is disabled.
5 to 30 seconds 10 seconds
Counter on the PVC full status
message polling requests (N391)
1 to 255 times 6 times
Error threshold counter at the user
side (N392)
1 to 10 times 3 times
Event counter at the user side (N393) 1 to 10 times 4 times
DCE Polling authentication timer at the
network side (T392)
5 to 30 seconds 15 seconds
Error threshold counter at the
network side (N392)
1 to 10 times 3 times
Event counter at the network side
(N393)
1 to 10 times 4 times