Cisco ASR 9000 Series Manuale di configurazione - Pagina 10
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Information About T3/E3 Controllers and Serial Interfaces
When configuring clocking on a serial link, you must configure one end to be internal, and the other
Note
end to be line. If you configure internal clocking on both ends of a connection, framing slips occur. If
you configure line clocking on both ends of a connection, the line does not come up.
Link Noise Monitoring on T1 or E1 Links
Link Noise Monitoring (LNM) provides the ability to monitor Path Code Violation (PCV) errors on T1
and E1 links on the 2-Port Channelized OC-12c/DS0 SPA on the Cisco ASR 9000 Series Router, and to
signal events and alarms on these links when noise continuously meets or exceeds configured thresholds
(the set threshold values) for those errors. Events are also signaled when noise falls below configured
improved thresholds (the clear threshold values).
Beginning in Cisco IOS XR Release 4.1, the LNM feature supports the lnm remove command to signal
the Noise Attribute to PPP to remove an MLPPP bundle member link when specified thresholds are
crossed.
An LCV is an occurrence of either a Bi-Polar Violation (BPV) or Excessive Zeroes (EXZ) error, and a
Note
PCV is an occurrence of a CRC error in a timeslot. However, the LNM feature currently only monitors
PCV errors. The LCV values are only used to calculate an expected PCV if the PCV values are not
specified. If the PCV values are specified, then the LCV values are ignored.
LNM Events
There are two basic types of monitoring events produced by LNM:
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Cisco ASR 9000 Aggregation Services Router Interface and Hardware Component Configuration Guide
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Configuring Clear Channel T3/E3 and Channelized T3 and T1/E1 Controllers on the Cisco ASR 9000 Series Router
Crossed events—A crossed event signals when PCV threshold values continuously meet or exceed
the specified set values for major and minor warnings for a specified period of time (duration).
When a crossed event occurs, the major or minor monitoring type for the controller is reported as
the alarm state. When the crossed event is no longer present, the monitoring type returns to the
stable state.
The following are examples of crossed events:
RP/0/RSP0/CPU0:Router#0/1/CPU0:May 13 9:54:10.980 : g_spa_1[181]:
%L2-T1E1_LNM-3-MINWARNNOISE :
Interface T10/1/1/0/1/1/1, noise crossed minor warning threshold
RP/0/RSP0/CPU0:Router#0/1/CPU0:May 13 9:54:11.980 : g_spa_1[181]:
%L2-T1E1_LNM-3-MAJWARNNOISE :
Interface T10/1/1/0/1/1/1, noise crossed major warning threshold
Cleared events—A cleared event signals when threshold values that were crossed have fallen below
the specified clear values for major and minor warnings.
The following are examples of cleared events:
RP/0/RSP0/CPU0:Router#LC/0/1/CPU0:May 13 10:27:25.809 : g_spa_1[181]:
%L2-T1E1_LNM-3-MAJWARNNOISE :
Interface T10/1/1/0/1/1/1, noise cleared major warning threshold
RP/0/RSP0/CPU0:Router#LC/0/1/CPU0:May 13 10:28:14.810 : g_spa_1[181]:
%L2-T1E1_LNM-3-MINWARNNOISE :
Interface T10/1/1/0/1/1/1, noise cleared minor warning threshold
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