protection-group 401 working
end
UPSR Protect Path Configuration:
enable
configure terminal
controller MediaType 0/12/6
mode sonet
controller sonet 0/12/6
rate oc48
sts-1 1 - 48 mode sts-48c
protection-group 401 protect
end
Verification of UPSR Configuration
Use the show protection-group command to verify UPSR configuration:
show protection-group
PGN Type Working I/f Protect I/f Active Status
-------------------------------------------------------------------------------
401 STS48C SONET0/3/6.1-48 SONET0/12/6.1-48 W A
-------------------------------------------------------------------------------
Status legend:D=Deleted FO=Force SF=SignalFailure SD=SignalDegrade
FL=Fail M=Manual L=Lockout C=Clear A=Auto
(W)=working, (P)=protect
Alarms at SONET Layers
SONET equipment detects events and alarms at each of SONET's three layers — section, line and path.
Typically, a SONET chassis sends alarms both upstream and downstream in order to notify other devices of
the problem condition.
SONET Alarm Surveillance
SONET alarm surveillance uses two terms:
• State—Condition that is reported or detected. A SONET chassis enters a state when the chassis detects
the occurrence of an event. A SONET chassis exits that state when the chassis no longer detects the
event.
• Indication—Prompted by a change of state. This indicates the presence of a condition. This document
discusses the Alarm Indication Signal (AIS), and Remote Defect Indicator (RDI).
The interface of active alarm or defect is maintained in a down/down state. The process used to troubleshoot
down/down SONET interfaces is similar to that for digital interfaces, such as T1 and T3.
Section Alarms
The following section alarms are supported:
• LOS — Loss of Signal
• LOF — Loss of Frame
• SEF — Severely Error Frame
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x (Cisco
ASR 900 Series)
33
Configuring SONET
Alarms at SONET Layers
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