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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.269 MANUAL-REQ-SPAN
SONET Logical Object: OCN
The Manual Switch Request on Ring condition occurs when a user initiates a MANUAL RING command
on BLSR rings to switch from working to protect or protect to working. This condition is visible on the
network view Alarms, Conditions, and History tabs and is accompanied by WKSWPR. The port where
the MANUAL RING command originated is marked with an “M” on the network view detailed circuit
map.
Clear the MANUAL-REQ-RING Condition
Step 1 Complete the “Clear a BLSR External Switching Command” procedure on page 2-269.
Step 2 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC 1 800 553-2447.
2.7.269 MANUAL-REQ-SPAN
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: EC1, OCN
DWDM Logical Objects: 2R, ESCON, FC, GE, ISC, TRUNK
The Manual Switch Request on Ring condition occurs on BLSRs when a user initiates a Manual Span
command to move BLSR traffic from a working span to a protect span. This condition appears on the
network view Alarms, Conditions, and History tabs. The port where the MANUAL SPAN command was
applied is marked with an “M” on the network view detailed circuit map.
Clear the MANUAL-REQ-SPAN Condition
Step 1 Complete the “Clear a BLSR External Switching Command” procedure on page 2-269.
Step 2 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC 1 800 553-2447.
2.7.270 MAX-STATIONS
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Object: RPRIF
The Maximum IEEE 802.17b-based RPR Station Number Exceeded alarm can be raised by all ML card
stations on a ring when the maximum quantity of stations, 255, is exceeded. This excess causes the
IEEE 802.17b-based RPR scheme—and traffic—to break down.
IEEE 802.17b-based RPR messaging uses time-to-live (TTL), an 8-bit value. The maximum value these
8 bits (one byte) can have is 255. As a message travels (or hops) from station to station, the TTL is
decremented by each station. Thus one station cannot communicate with another station more than 255
hops away.
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