Cisco Systems uBR7200 manual Setting Cable Flap List Miss Threshold, MC-605

Page 87

Configuring Headend Broadband Access Router Features

Troubleshooting Using Cable Flap Lists

Command

Purpose

 

 

CMTS01(config)# cable flap-list power-adjust threshold dbmv

Specifies the minimum power adjustment that will

 

constitute a flap list event.

 

 

Verifying Cable Flap List Power Adjustment Threshold

To verify the cable flap list power adjustment threshold, enter the show cable flap list command:

CMTS01# show cable flap list

 

 

 

 

 

 

 

Mac Addr

CableIF

Ins

Hit

Miss

CRC

P-Adj

Flap

Time

 

0010.7b6b.5d1d

C3/0 U0

0

688

169

0

0

3

Nov 5

12:28:50

0010.7b6b.5e15

C3/0 U0

1

707

185

0

0

5

Nov 5

12:29:52

0010.7b6b.5e27

C3/0 U0

1

707

198

0

0

5

Nov 5

12:29:55

0010.7b6b.5d29

C3/0 U0

1

709

205

0

0

5

Nov 5

12:29:52

0010.7b6b.5e2b

C3/0 U0

1

710

204

0

0

7

Nov 5

12:30:16

Setting Cable Flap List Miss Threshold

You can specify the miss threshold for recording a flap list event. A miss is the number of times a cable modem does not acknowledge a MAC-layer keepalive message from a cable modem card. An

8 percent miss rate is normal for the Cisco cable modem cards. When the number of misses exceeds the threshold, the cable modem is placed in the flap list.

Note A high miss rate can indicate intermittent upstream problems, fiber laser clipping, or common-path distortion.

To set the miss threshold for recording a flap list event, use the following command in global configuration mode:

Command

Purpose

 

 

CMTS01(config)# cable flap-list miss-threshold misses

Specifies the number of MAC-layer keepalive

 

misses that will result in the cable modems being

 

place in the flap list.

 

 

Verifying Cable Flap List Miss Threshold

To verify the cable flap list miss threshold, enter the show cable flap list command:

CMTS01# show cable flap list

 

 

 

 

 

 

 

Mac Addr

CableIF

Ins

Hit

Miss

CRC

P-Adj

Flap

Time

 

0010.7b6b.5d1d

C3/0 U0

0

688

169

0

0

3

Nov 5

12:28:50

0010.7b6b.5e15

C3/0 U0

1

707

185

0

0

5

Nov 5

12:29:52

0010.7b6b.5e27

C3/0 U0

1

707

198

0

0

5

Nov 5

12:29:55

0010.7b6b.5d29

C3/0 U0

1

709

205

0

0

5

Nov 5

12:29:52

0010.7b6b.5e2b

C3/0 U0

1

710

204

0

0

7

Nov 5

12:30:16

Cisco IOS Multiservice Applications Configuration Guide

MC-605

Image 87
Contents MC-519 Configuring Headend Broadband Access Router FeaturesMC-520 Headend OverviewTopology of a Typical Broadband Network Voice over IP Services MC-523 Telco ReturnTOD MC-524MC-525 QoS FeaturesService Class Profiles Multiple Service IDsTAG/NetFlow Switching QoS Profile EnforcementMC-526 Tag Switching Netflow SwitchingMC-527 Committed Access Rate CAR Security FeaturesWeighted Random Early Detection Weighted Fair QueueingMC-529 Cable Modem and Multicast Authentication Using RadiusDocsis Baseline Privacy Upstream Address VerificationMC-530 Traffic Shaping FeaturesOperations and Provisioning Features Dynamic RangingCPE Limitation Downstream Channel ID ConfigurationBurst Profile Configuration Downstream Frequency OverrideSpectrum Management MC-533 Headend Broadband Access Router Configuration PrerequisitesMC-534 Headend Broadband Access Router Configuration TasksActivating the Downstream Carrier Configuring the Downstream Cable InterfaceCMTS01# configure terminal CMTS01config# interface cable 6/0MC-536 Setting the Downstream Center FrequencyTroubleshooting Tips Verifying the Downstream CarrierCMTS01config-if#cable downstream frequency Verifying the Downstream Center FrequencyMC-537 MC-538 Setting the Downstream Channel IDSetting the Downstream Mpeg Framing Format Annex B Verifying the Downstream Channel IDMC-539 Setting the Downstream ModulationVerifying the Downstream Mpeg Framing Format Verifying the Downstream ModulationMC-540 Setting the Downstream Interleave DepthCMTS01config-if#cable downstream interleave-depth Verifying the Downstream Interleave DepthSetting the Downstream Helper Address Verifying the Downstream Helper AddressMC-541 MC-542 Setting Downstream Rate LimitingConfiguring the Upstream Cable Interface Verifying Downstream Rate LimitingMC-543 MC-544 Setting the Upstream FrequencyVerifying the Upstream Frequency MC-545CMTS01# show controllers cable 6/0 u0 Channel-width width Setting the Upstream Channel WidthVerifying Upstream Channel Width MC-546MC-547 Setting the Upstream Input Power LevelMC-548 Verifying the Upstream Input Power LevelActivating Upstream Admission Control Verifying Upstream Admission ControlMC-549 Activating Upstream FECMC-550 Router# more systemrunning-configSpecifying Upstream Minislot Size Verifying Upstream FECActivating the Upstream Scrambler Verifying Upstream Minislot SizeMC-551 MC-552 CMTS01config-if#cable upstream usport scramblerCMTS01# more systemrunning-config Verifying the Upstream ScramblerMC-553 Activating Upstream Differential EncodingActivating Upstream Rate Limiting Verifying Upstream Differential EncodingCMTS01config-if#no cable upstream usport rate-limit Verifying Upstream Rate LimitingMC-554 Activating Upstream Frequency Adjustment Frequency-adjust averaging percentageMC-555 Activating Upstream Power Adjustment Verifying Upstream Frequency AdjustmentMC-556 Continue seconds Activating Upstream Timing AdjustmentVerifying Upstream Power Adjustment MC-557Verifying Upstream Timing Adjustment Activating the Upstream PortsMC-558 Setting Upstream Backoff Values Verifying the Upstream PortsMC-559 Data-backoff automatic CMTS01config-if#cable upstream usport rangeMC-560 Data-backoff start endConfiguring and Activating Baseline Privacy Verifying Upstream Data Backoff AutomaticMC-561 Configuring KEK Privacy CMTS01config-if#cable privacy kek grace-timeMC-562 MC-563 Configuring TEK PrivacyVerifying KEK Privacy Verifying TEK PrivacyMC-564 Configuring and Activating Frequency AgilityActivating Baseline Privacy Verifying Baseline PrivacyMC-565 Combiner GroupsMC-566 Frequency Management PolicyMC-567 Determining the Upstream Ports Assigned to a Combiner GroupMC-568 Configuring and Activating Spectrum GroupsCreating Spectrum Groups Verifying Spectrum GroupsMC-569 Command PurposeMC-570 Verifying Spectrum Group Configuration Verifying Frequency HoppingMC-571 MC-572 Configuring Spectrum Group CharacteristicsThreshold percent Verifying Spectrum Group CharacteristicsCMTS01config# cable spectrum-group groupnum hop MC-573Verifying Spectrum Group and Upstream Port Assignments Activating IP Address Resolution ProtocolAssigning the Spectrum Group and the Upstream Ports Activating Cable ARP RequestsActivating Host-to-Host Communication Proxy ARP Verifying ARP RequestsMC-575 Verifying Cable Proxy ARP Requests Configuring Dhcp OptionsActivating Cable Proxy ARP Requests Activating Cable Relay AgentActivating Dhcp giaddr Verifying Dhcp giaddr ActivationMC-577 Verifying ToD Service Setting Service OptionsSetting Optional IP Parameters Configuring ToD ServiceMC-579 Activating IP Multicast EchoActivating IP Broadcast Echo Verifying IP Multicast EchoMC-580 Configuring Cable ProfilesConfiguring Cable Modulation Profiles Verifying IP Broadcast EchoMC-581 Number profileConfiguring QoS Profiles Verifying Cable Modulation ProfilesMC-582 MC-583 Verifying QoS ProfilesMC-584 Setting QoS PermissionEnforcing a QoS Profile Assignment Verifying QoS PermissionManaging Cable Modems on the HFC Network Verifying a QoS Profile AssignmentMC-585 Verifying Sync Message Interval Configuring Sync Message IntervalConfiguring Telco Return Activating Cable Modem AuthenticationVerifying Cable Modem Authentication Activating Cable Modem Upstream Address VerificationMC-587 MC-588 CMTS01config-if#cable source-verify dhcpActivating Cable Modem Insertion Interval Verifying Cable Modem Upstream Address VerificationCMTS01config-if#cable insertion-interval automatic Verifying Cable Modem Insertion IntervalMC-589 Configuring Cable Modem Registration Timeout Verifying the Maximum Number of HostsMC-590 Clearing and Resetting Cable Modems Verifying Registration TimeoutMC-591 Verifying Cable Modem Clearing and Resetting Clearing Cable Modem CountersMC-592 MC-593 Using Ping DocsisVerifying that Cable Modem Counters are Cleared Verifying Ping DocsisMC-594 Spectrum Management Configuration ExampleMC-595 Virtual Private Network Configuration ExampleMC-596 MC-597 Ip http server Ip http authentication local No cdp runMC-598 VoIP Configuration ExampleIp subnet-zero No ip domain-lookup MC-599MC-600 Telco Return Configuration ExampleMC-601 Cable telco-return enableCable Reg QoS Profile Enforcement Configuration ExampleCable Modem all reset MC-602MC-603 Troubleshooting Using Cable Flap ListsSetting Cable Flap List Aging CMTS01config# cable flap-list aging daysVerifying Cable Flap List Insertion Time Setting Cable Flap List Insertion TimeSetting Cable Flap List Power Adjustment Threshold Verifying Cable Flap List AgingVerifying Cable Flap List Miss Threshold Setting Cable Flap List Miss ThresholdVerifying Cable Flap List Power Adjustment Threshold CMTS01config# cable flap-list miss-threshold missesMC-606 Setting Cable Flap List SizeClearing Cable Flap List Verifying Cable Flap List Size
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