Cisco ONS 15454 Troubleshooting Manual page 332

2.7.187 LCAS-RX-DNU
The Link Capacity Adjustment Scheme (LCAS) Control Word CRC Failure condition is raised against
ML-Series Ethernet and CE-series cards. It occurs when there is an equipment, path, or provisioning
error on the virtual concatenation group (VCG) that causes consecutive 2.5 second CRC failures in the
LCAS control word.
Transmission errors would be reflected in CV-P, ES-P, or SES-P performance monitoring statistics. If
these errors do not exist, an equipment failure is indicated.
If LCAS is not supported on the peer node, the condition does not clear.
LCAS-CRC can also occur if the VCG source node is not LCAS-enabled, but the receiving node does
have the capability enabled. Both source and destination nodes must have LCAS enabled. Otherwise, the
LCAS-CRC condition persists on the VCG.
For more information about the ML-Series Ethernet cards, refer to the Cisco ONS 15454 and
Note
Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide.
Clear the LCAS-CRC Condition
Look for and clear any associated equipment failures, such as the EQPT alarm, on the receive node or
Step 1
transmit node.
Step 2 Look for and clear any bit error rate alarms at the transmit node.
Step 3 If no equipment or SONET path errors exist, ensure that the remote node has LCAS enabled on the
circuit:
a.
b.
c.
d.
If the column does not say LCAS, complete the
Step 4
it in LCAS mode using the instructions in the Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet
Card Software Feature and Configuration Guide.
If the condition does not clear, log into the Technical Support Website at
Step 5
http://www.cisco.com/techsupport for more information or call Cisco TAC 1 800 553-2447.
2.7.187 LCAS-RX-DNU
The LCAS VCG Member Receive-Side-In Do Not Use condition is raised on CE-MR-10 cards and
ML-MR-10 Ethernet cards when the receive side of an LCAS VCG member is in the do-not use state.
For a unidirectional failure, this condition is only raised at the source node.
The node reporting this condition likely reports an
page 2-205
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-138
In node view, click the Circuits tab.
Choose the VCAT circuit and click Edit.
In the Edit Circuit window, click the General tab.
Verify that the Mode column says LCAS.
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Objects: STSTRM, VT-TERM
for CE-MR-10, and
"Delete a Circuit" procedure on page 2-275
"RFI-P" alarm on page 2-205
"RFI-P" alarm on page 2-205
Chapter 2 Alarm Troubleshooting
and "RFI-V" alarm on
for ML-MR-10.
and recreate
November 2009