Cisco ONS 15454 Troubleshooting Manual page 284

2.7.96 E-W-MISMATCH
The Rear Panel Ethernet Link Removed condition, if enabled in the network defaults, is raised under the
following conditions:
•
•
•
For more information about Ethernet cards, refer to the Cisco ONS 15454 and
Note
Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide.
Clear the ETH-LINKLOSS Condition
To clear this condition, reconnect the backplane LAN cable. Refer to the "Install the Shelf and Backplane
Step 1
Cable" chapter in the Cisco ONS 15454 Procedure Guide for procedures to install this cable.
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.
2.7.96 E-W-MISMATCH
A Procedural Error Misconnect East/West Direction alarm occurs during BLSR setup, or when nodes in
a ring have slots misconnected. An east slot can be misconnected to another east slot, or a west slot can
be misconnected to another west slot. In most cases, the user did not connect the fibers correctly or the
ring provisioning plan was flawed. You can physically reconnect the cable to the correct slots to clear
the E-W-MISMATCH alarm. Alternately, you can delete and recreate the span in CTC to change the west
line and east line designations. The CTC method clears the alarm, but could change the traditional
east-west node connection pattern of the ring.
The E-W-MISMATCH alarm also appears during the initial set up of a ring with its east-west slots
Note
configured correctly. If the alarm appears during the initial setup, the alarm clears itself shortly after the
ring setup is complete.
The lower-numbered slot at a node is traditionally labeled the west slot and the higher numbered slot is
Note
labeled the east slot. For example, Slot 6 is west and Slot 12 is east.
The physical switch procedure is the recommend method of clearing the E-W-MISMATCH alarm. The
Note
physical switch method reestablishes the logical pattern of connection in the ring. However, you can also
use CTC to recreate the span and identify the misconnected slots as east and west. The CTC method is
useful when the misconnected node is not geographically near the troubleshooter.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-90
SONET Logical Object: NE
The node.network.general.AlarmMissingBackplaneLAN field in NE default is enabled.
The node is configured as a gateway network element (GNE).
The backplane LAN cable is removed.
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Object: OCN
Chapter 2 Alarm Troubleshooting
November 2009