•
The following command displays input and output rates, input errors, CRC, frames, overruns, underruns,
collisions, interface resets. High input errors in the CMTS retrieved from this query suggest noisy
upstream. In older versions of the chassis, loose midplane and line card screws caused a similar problem:
show interface slot/downstream-port
•
The following command displays upstream packet discards, errors, error-free packets, correctable and
uncorrectable errors, noise, and micro-reflection statistics.
show interface slot/downstream-port upstream
Configuration Examples for Flap List Troubleshooting
The following excerpt from a configuration file shows a typical flap-list configuration:
!
cable flap-list insertion-time 120
cable flap-list power-adjust threshold 3
cable flap-list miss-threshold 4
cable flap-list aging 8
cable flap-list size 8191
...
Additional References
For additional information related to the Flap List Troubleshooting feature, refer to the following references:
Related Documents
Document TitleRelated Topic
Cisco CMTS Cable Command ReferenceCMTS Command Reference
http://www.cisco.com/c/en/us/support/
cloud-systems-management/
broadband-troubleshooter/
tsd-products-support-series-home.html
Cisco Broadband Troubleshooter
Standards
TitleStandards
4
Data-Over-Cable Service Interface Specification
DOCSIS 1.0 Radio Frequency Interface (RFI)
ANSI/SCTE 22-1 2012 (formerly
SP-RFI-C01-011119)
Data-over-Cable Service Interface Specifications
Radio Frequency Interface Specification
SP-RFIv1.1-I08-020301
Cisco cBR Series Converged Broadband Routers Troubleshooting and Network Management Configuration Guide
for Cisco IOS XE Fuji 16.8.x
213
Flap List Troubleshooting
Configuration Examples for Flap List Troubleshooting
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