Troubleshooting guide

11-3
Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 11 Element Management and MIBs
Cisco uBR7246vxr MIBs
ccsFlapUpstreamIfIndex The ifIndex of the Cable upstream interface whose ifType is
docsCableUpstream(129). The CMTS detects a flapping MTA
from its Cable upstream interface.
ccsFlapDownstreamIfIndex The ifIndex of the Cable downstream interface whose ifType is
docsCableDownstream(128).
ccsFlapInsertionFails The number of times a MTA registered more frequently than
expected. Excessive registration is defined as the presence of a
time span between two successive registration cycles which is
less than a threshold span (ccsFlapInsertionTime).
A MTA may fail the ranging or registration process due to not
being able to get an IP address. When the MTA can not finish
registration within the insertion time, it retries the process and
sends the Initial Maintenance packet again. CMTS will receive
the Initial Maintenance packet from the MTA sooner than
expected and the MTA is considered a flapping modem.
This count may indicate:
• Intermittent downstream sync loss, or
• DHCP or modem registration problems.
The Flap Count (ccsFlapTotal) will be increased when this
counter is increased.
Discontinuities in the value of this counter can occur if this
entry is removed from the table and then re-added, and are
indicated by a change in the value of ccsFlapCreateTime.
ccsFlapHits The number of times the CMTS receives the Ranging request
from the MTA.
The CMTS issues a Station Maintenance transmit opportunity
at a typical rate of once every 10 seconds and waits for a
Ranging request from the MTA. If the CMTS receives a
Ranging request then the Hit count will be increased by 1.
If the FlapTotal count is high, both Hits and Misses counts are
high, and other counters are relatively low then the flapping is
probably caused by the modem going up and down. The Hits
and Misses counts are keep-alive polling statistics. The Hits
count should be much greater than the Misses count.
Discontinuities in the value of this counter can occur if this
entry is removed from the table and then re-added, and are
indicated by a change in the value of ccsFlapCreateTime.
Table 11-1 CISCO-CABLE-SPECTRUM-MIB.my Objects (continued)
Object Description