Cisco Cable Manager And Cisco Broadband Troubleshooter; Benefits; How To Configure Flap List Troubleshooting - Cisco cBR-8 Configuration And Troubleshooting Manual
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Flap List Troubleshooting
Tip
The system supports automatic power adjustments. The show cable flap-list and show cable modem
commands indicate when the headend cable router has detected an unstable return path for a particular
modem and has compensated with a power adjustment. An asterisk (*) appears in the power-adjustment
field for a modem when a power adjustment has been made; an exclamation point (!) appears when the
modem has reached its maximum power-transmit level and cannot increase its power level any further.
Cisco Cable Manager and Cisco Broadband Troubleshooter
The Flap List Troubleshooting feature is supported by Cisco Cable Manager (CCM), Release 2.0 or later,
which is a UNIX-based software suite that manages routers and DOCSIS-compliant cable modems, generates
performance reports, troubleshoots connectivity problems, views the network graphically, and edits DOCSIS
configuration files. You can access the CCM locally from the CCM server console or remotely from a UNIX
workstation or a PC.
The Flap List Troubleshooting feature also works together with the Cisco Broadband Troubleshooter (CBT),
which is a graphical-based application to manage and diagnose problems on the hybrid fiber-coaxial (HFC)
network. Radio frequency (RF) technicians can quickly isolate plant and provisioning problems and characterize
upstream and downstream trouble patterns, including analyzing flapping modems.
Benefits
The Flap List Troubleshooting feature is a proactive way to manage and troubleshoot problems on an HFC
network. Its use of passive monitoring is more scalable and efficient than techniques that send special messages
to cable modems or that regularly poll the cable modems using Simple Network Management Protocol (SNMP)
commands. Because it uses mechanisms that already exist in a DOCSIS network, it can be used with any
DOCSIS-certified cable modem or set-top box.
The flap list provides a cable technician with both real-time and historical cable health statistics for quick,
accurate problem isolation and network diagnosis. Using the flap list, a cable technician is able to do the
following:
• Quickly learn how to characterize trouble patterns in the hybrid fiber-coaxial (HFC) network.
• Determine which amplifier or feeder line is faulty.
• Distinguish an upstream path problem from a downstream one.
• Isolate an ingress noise problem from a plant equipment problem.
How to Configure Flap List Troubleshooting
This section describes how to configure the flap list operation on the Cisco CMTS. You can use either the
command-line interface (CLI) commands or Simple Network Management Protocol (SNMP) commands to
configure the flap list, to remove a cable modem from the list, or to clear the flap-list counters.
Cisco cBR Series Converged Broadband Routers Troubleshooting and Network Management Configuration Guide
Cisco Cable Manager and Cisco Broadband Troubleshooter
for Cisco IOS XE Fuji 16.8.x
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Troubleshooting
