HPE FlexNetwork MSR Series Comware 5 Layer 2 - Wan Access Configuration Guide

87
• ANSI T1.617 Annex D
• Nonstandard LMI (compatible with other vendors)
To communicate, the DTE and the DCE must use the same type of LMI.
LMI uses the status inquiry message and the status messages to maintain the link status and PVC
status, for example, to advertise new PVCs, detect deleted PVCs, monitor PVC status changes, and
verify link integrity. For these purposes, the DTE sends status inquiry messages regularly to the DCE
to request for the availability of individual PVCs. On receiving a status inquiry, the DCE responds
with a status message that describes the status of each virtual circuit on the physical link.
For a DTE, the status of a PVC is determined by the DCE; as for DCE, by the frame relay network.
Table 2 list
s the major parameters ITU-T Q.933 Annex A uses for message exchange. You can
configure these parameters to optimize device performance.
Table 2 Parameter description for frame relay protocol
Device
role
Timer/counter
Value
range
Default
value
Description
DTE
Full status polling
counter (N391)
1 to 255 6
Sets the frequency with which status inquires
expect a full status report.
Suppose the N391 is set to 5. Every fifth status
inquiry sent by the DTE will ask for a full status
report. The intermediate inquiries ask for a
keepalive exchange only.
Error threshold
counter (N392)
1 to 10 3
Sets the number of errors required for LMI to
declare a link dead, within the event count
specified by N393.
Monitored events
counter (N393)
1 to 10 4
Sets the monitored event count. If the number
of errors within the N393 status inquiries
reaches N392, the DTE considers that the
error threshold is reached.
Keepalive (link
integrity
verification polling)
timer (T391)
0 to 32767
0 means
LMI
disabled.
10
Sets the interval (in seconds) at which the
DTE sends a status inquiry message. An error
is recorded if no reply is received before the
timer expires.
DCE
Error threshold
counter (N392)
1 to 10 3
Sets the number of errors required for LMI to
declare a link dead, within the event count
specified by N393.
Monitored events
count (N393)
1 to 10 4 Sets the monitoring interval for error counts.
Keepalive (polling
verification) timer
(T392)
5 to 30 15
Sets the interval (in seconds) for receiving a
status inquiry message. If no status inquiry
message is received before the timer expires,
an error is recorded.
Typical application scenarios
As shown in Figure 24, you can use frame relay to construct a public or private network, and even
direct connections between data equipment, as shown in Figure 25.

HPE FlexNetwork MSR Series Specifications

General

Brand	HPE
Model	FlexNetwork MSR Series
Category	Network Router
Language	English