Cisco Systems uBR7200 manual QoS Profile Enforcement, TAG/NetFlow Switching, MC-526

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Configuring Headend Broadband Access Router Features

QoS Features

Multiple SIDs provide the following functionality:

Voice traffic can be designated on a higher QoS committed information rate (CIR) secondary SID, while data traffic can be forwarded on a best-effort basis on a primary SID.

Secondary SIDs are higher QoS CIR-type classes to be used for higher priority traffic such as voice. These classes have a nonzero minimum reserved rate (CIR-type service). Thus, these SIDs receive preferential treatment at the headend for grants over any tiered best effort type data SID for that upstream. Best-effort service involves requests with no minimum upstream rate on the channel.

The CMTS treats the primary and secondary SIDs independently for issuing grants. Each SID of a cable modem has an independent state machine. Channel access for each SID is independent of the other SID.

Note Reliable operation with voice requires multiple SIDs—at least two per cable modem to separate voice from data traffic. In DOCSIS 1.0, SIDs are set up statically. In DOCSIS 1.1, SIDs can be set up either statically or dynamically.

QoS Profile Enforcement

QoS profile enforcement allows you to override the provisioned service class of a cable modem with a static CMTS-defined QoS profile. A static CMTS-defined QoS profile gives you control of the cable modem QoS and eliminates any interference from improper local-rate limiting implemented on the cable modem.

When this feature is enabled, the CMTS provisions each registering cable modem with a default DOCSIS

1.0service class that is assigned by the CMTS operator. The operator-defined service class is enforced on cable modems attempting to register with the CMTS regardless of the provisioned class of service. The default service class has no upstream or downstream rate limits.

When the cable modem sends data upstream, it makes bandwidth requests without throttling or dropping packets because of its own rate-policing algorithm. The CMTS does traffic shaping based on the QoS profile enforced by the operator.

Note By default, the system will not enforce a specific QoS profile on the cable modem. The QoS profile assigned to the cable modem will depend on the class of service parameters provisioned in the DOCSIS configuration file.

TAG/NetFlow Switching

TAG switching and Netflow switching provide high performance for network layer services, enabling per-flow application of network services such as security and traffic accounting. The following data is collected for each flow:

Source and destination IP address

Start of flow and end of flow timestamps

Packet and byte counts

Next hop router address

Input and output physical port interfaces

Cisco IOS Multiservice Applications Configuration Guide

MC-526

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Contents Configuring Headend Broadband Access Router Features MC-519Headend Overview MC-520Topology of a Typical Broadband Network Voice over IP Services Telco Return MC-523MC-524 TODQoS Features Service Class ProfilesMultiple Service IDs MC-525MC-526 TAG/NetFlow SwitchingQoS Profile Enforcement MC-527 Tag SwitchingNetflow Switching Security Features Weighted Random Early DetectionWeighted Fair Queueing Committed Access Rate CARCable Modem and Multicast Authentication Using Radius Docsis Baseline PrivacyUpstream Address Verification MC-529Traffic Shaping Features Operations and Provisioning FeaturesDynamic Ranging MC-530Downstream Channel ID Configuration Burst Profile ConfigurationDownstream Frequency Override CPE LimitationSpectrum Management Headend Broadband Access Router Configuration Prerequisites MC-533Headend Broadband Access Router Configuration Tasks MC-534Configuring the Downstream Cable Interface CMTS01# configure terminalCMTS01config# interface cable 6/0 Activating the Downstream CarrierSetting the Downstream Center Frequency Troubleshooting TipsVerifying the Downstream Carrier MC-536MC-537 CMTS01config-if#cable downstream frequencyVerifying the Downstream Center Frequency Setting the Downstream Channel ID Setting the Downstream Mpeg Framing Format Annex BVerifying the Downstream Channel ID MC-538Setting the Downstream Modulation Verifying the Downstream Mpeg Framing FormatVerifying the Downstream Modulation MC-539Setting the Downstream Interleave Depth CMTS01config-if#cable downstream interleave-depthVerifying the Downstream Interleave Depth MC-540MC-541 Setting the Downstream Helper AddressVerifying the Downstream Helper Address Setting Downstream Rate Limiting MC-542MC-543 Configuring the Upstream Cable InterfaceVerifying Downstream Rate Limiting Setting the Upstream Frequency MC-544CMTS01# show controllers cable 6/0 u0 Verifying the Upstream FrequencyMC-545 Setting the Upstream Channel Width Verifying Upstream Channel WidthMC-546 Channel-width widthSetting the Upstream Input Power Level MC-547Verifying the Upstream Input Power Level Activating Upstream Admission ControlVerifying Upstream Admission Control MC-548Activating Upstream FEC MC-549Router# more systemrunning-config Specifying Upstream Minislot SizeVerifying Upstream FEC MC-550MC-551 Activating the Upstream ScramblerVerifying Upstream Minislot Size CMTS01config-if#cable upstream usport scrambler CMTS01# more systemrunning-configVerifying the Upstream Scrambler MC-552Activating Upstream Differential Encoding Activating Upstream Rate LimitingVerifying Upstream Differential Encoding MC-553MC-554 CMTS01config-if#no cable upstream usport rate-limitVerifying Upstream Rate Limiting MC-555 Activating Upstream Frequency AdjustmentFrequency-adjust averaging percentage MC-556 Activating Upstream Power AdjustmentVerifying Upstream Frequency Adjustment Activating Upstream Timing Adjustment Verifying Upstream Power AdjustmentMC-557 Continue secondsMC-558 Verifying Upstream Timing AdjustmentActivating the Upstream Ports MC-559 Setting Upstream Backoff ValuesVerifying the Upstream Ports CMTS01config-if#cable upstream usport range MC-560Data-backoff start end Data-backoff automaticMC-561 Configuring and Activating Baseline PrivacyVerifying Upstream Data Backoff Automatic MC-562 Configuring KEK PrivacyCMTS01config-if#cable privacy kek grace-time Configuring TEK Privacy Verifying KEK PrivacyVerifying TEK Privacy MC-563Configuring and Activating Frequency Agility Activating Baseline PrivacyVerifying Baseline Privacy MC-564Combiner Groups MC-565Frequency Management Policy MC-566Determining the Upstream Ports Assigned to a Combiner Group MC-567Configuring and Activating Spectrum Groups Creating Spectrum GroupsVerifying Spectrum Groups MC-568Command Purpose MC-569MC-570 MC-571 Verifying Spectrum Group ConfigurationVerifying Frequency Hopping Configuring Spectrum Group Characteristics MC-572Verifying Spectrum Group Characteristics CMTS01config# cable spectrum-group groupnum hopMC-573 Threshold percentActivating IP Address Resolution Protocol Assigning the Spectrum Group and the Upstream PortsActivating Cable ARP Requests Verifying Spectrum Group and Upstream Port AssignmentsMC-575 Activating Host-to-Host Communication Proxy ARPVerifying ARP Requests Configuring Dhcp Options Activating Cable Proxy ARP RequestsActivating Cable Relay Agent Verifying Cable Proxy ARP RequestsMC-577 Activating Dhcp giaddrVerifying Dhcp giaddr Activation Setting Service Options Setting Optional IP ParametersConfiguring ToD Service Verifying ToD ServiceActivating IP Multicast Echo Activating IP Broadcast EchoVerifying IP Multicast Echo MC-579Configuring Cable Profiles Configuring Cable Modulation ProfilesVerifying IP Broadcast Echo MC-580Number profile MC-581MC-582 Configuring QoS ProfilesVerifying Cable Modulation Profiles Verifying QoS Profiles MC-583Setting QoS Permission Enforcing a QoS Profile AssignmentVerifying QoS Permission MC-584MC-585 Managing Cable Modems on the HFC NetworkVerifying a QoS Profile Assignment Configuring Sync Message Interval Configuring Telco ReturnActivating Cable Modem Authentication Verifying Sync Message IntervalMC-587 Verifying Cable Modem AuthenticationActivating Cable Modem Upstream Address Verification CMTS01config-if#cable source-verify dhcp Activating Cable Modem Insertion IntervalVerifying Cable Modem Upstream Address Verification MC-588MC-589 CMTS01config-if#cable insertion-interval automaticVerifying Cable Modem Insertion Interval MC-590 Configuring Cable Modem Registration TimeoutVerifying the Maximum Number of Hosts MC-591 Clearing and Resetting Cable ModemsVerifying Registration Timeout MC-592 Verifying Cable Modem Clearing and ResettingClearing Cable Modem Counters Using Ping Docsis Verifying that Cable Modem Counters are ClearedVerifying Ping Docsis MC-593Spectrum Management Configuration Example MC-594Virtual Private Network Configuration Example MC-595MC-596 Ip http server Ip http authentication local No cdp run MC-597VoIP Configuration Example MC-598MC-599 Ip subnet-zero No ip domain-lookupTelco Return Configuration Example MC-600Cable telco-return enable MC-601QoS Profile Enforcement Configuration Example Cable Modem all resetMC-602 Cable RegTroubleshooting Using Cable Flap Lists Setting Cable Flap List AgingCMTS01config# cable flap-list aging days MC-603Setting Cable Flap List Insertion Time Setting Cable Flap List Power Adjustment ThresholdVerifying Cable Flap List Aging Verifying Cable Flap List Insertion TimeSetting Cable Flap List Miss Threshold Verifying Cable Flap List Power Adjustment ThresholdCMTS01config# cable flap-list miss-threshold misses Verifying Cable Flap List Miss ThresholdSetting Cable Flap List Size Clearing Cable Flap ListVerifying Cable Flap List Size MC-606
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