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Optimizing Converged Cisco Networks (ONT)

Optimizing Converged Cisco Networks (ONT). Module 5: Implement Cisco AutoQoS. Module 5: Implement Cisco AutoQoS. Lesson 5.2: Mitigating Common Cisco AutoQoS Issues. Objectives. Describe common issues with Cisco AutoQoS. Explain how to interpret AutoQoS generated commands.

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Optimizing Converged Cisco Networks (ONT)

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  1. Optimizing Converged Cisco Networks (ONT) Module 5: Implement Cisco AutoQoS

  2. Module 5: Implement Cisco AutoQoS Lesson 5.2: Mitigating Common Cisco AutoQoS Issues

  3. Objectives • Describe common issues with Cisco AutoQoS. • Explain how to interpret AutoQoS generated commands. • Determine when manual modification of AutoQoS commands is necessary. • Describe methods for making manual modifications to AutoQoS generated commands.

  4. Major Enterprise QoS Requirements • Trust boundary definition • Identification of applications, protocols of interest (number of classes), and their QoS requirements • Determination of classification options • Determination of traffic-marking options • Determination of queue mechanisms and optimal parameters per class • Definition of port- and interface-specific transport features • Designation of bandwidth efficiency mechanisms for low-speed links • Identification of efficient alarm and event-monitoring options

  5. DiffServ QoS Mechanisms Enabled by Cisco AutoQoS • DiffServ functions are automated and simplified to expedite deployment of QoS features for voice, video, and data.

  6. Automated Cisco AutoQoS DiffServ Class Provisioning

  7. Common Issues with Cisco AutoQoS

  8. Interpreting Generated Cisco AutoQoS Configuration • Generated Cisco AutoQoS configuration is examined using show auto qos command, answering these questions: • How many classes were identified (class maps)? • Which traffic classification (class map) options were selected? • Which traffic marking options were selected (policy maps)? • Which queuing mechanisms and parameters were designated (policy maps)? • Which other QoS mechanisms were appointed per class (policy maps)? • Were any traffic parameters suggested? • Where was the autogenerated policy applied (interface, DLCI, or PVC)?

  9. How to Interpret the show auto qos Command Output router#show auto qos ! policy-map AutoQoS-Policy-Se2/1.1 class AutoQoS-Voice-Se2/1.1 priority percent 50 set dscp ef class AutoQoS-Inter-Video-Se2/1.1 bandwidth remaining percent 10 set dscp af41 class AutoQoS-Transactional-Se2/1.1 bandwidth remaining percent 5 set dscp af21 <...part of the output deleted...> ! policy-map AutoQoS-Policy-Se2/1.1-Parent class class-default shape average 1024000 service-policy AutoQoS-Policy-Se2/1.1 ! class-map match-any AutoQoS-Voice-Se2/1.1 match protocol rtp audio ! class-map match-any AutoQoS-Transactional-Se2/1.1 match protocol sqlnet <...part of the output deleted...> <...continues on the next slide...> LLQ Class-Based Marking Nested Policy Map(Frame Relay) CBWFQ Parent Policy Map(Frame Relay) Class-Based Shaping NBAR Classification

  10. Frame Relay How to Interpret the show auto qos Command Output (Cont.) • Monitoring Drops in LLQ • Thresholds are activated in RMON alarm table to monitor drops in Voice Class. • The default drop threshold is 1 bps. RMON event generated by AutoQoS Rmon event 33333 log trap AutoQoS description “AutoQoS SNMP traps for Voice Drops” owner AutoQoS Rmon alarm 33350 cbQoSCMDDropBitRate.2881.2991 30 Absolute rising-threshold 1 33333 falling-threshold 0 Owner AutoQoS

  11. How to Interpret the show auto qos Command Output (Cont.) rmon event 33333 log trap AutoQoS description "AutoQoS SNMP traps for Voice Drops" owner AutoQoS Serial2/1.1: DLCI 58 - ! interface Serial2/1.1 point-to-point frame-relay interface-dlci 58 class AutoQoS-FR-Serial2/1-58 ! map-class frame-relay AutoQoS-FR-Serial2/1-58 frame-relay cir 1024000 frame-relay bc 10240 frame-relay be 0 frame-relay mincir 1024000 service-policy output AutoQoS-Policy-Se2/1.1-Parent RMON Traps for Voice Packet Drops Applying all to the DLCI (or Policy Map to the Serial in Non-Frame Relay) Frame Relay Traffic Parameters

  12. When Is Manual Modification ofAutoQoS Configuration Required?

  13. NBAR and ACL Classification • Cisco AutoQoS uses NBAR and ACLs to generate classifications • Any MQC classification mechanism can manually tune the generated classification: • Start the Auto Discovery and review the generated results (or take the active classification if Cisco AutoQoS is already activated). • Copy the generated classification and modify it offline. • Apply the modified classification to a router. class-map match-any AutoQoS-Voice-Se2/1.1 match protocol rtp audio ! class-map match-any AutoQoS-Signaling-Se2/1.1 match access-group 101 match protocol rtcp ! class-map match-any AutoQoS-Transactional-Se2/1.1 match protocol sqlnet match protocol citrix ! access-list 101 permit tcp any any eq 1719 access-list 101 permit tcp any any eq 1720 access-list 101 permit udp any any eq 2427 access-list 101 permit udp any any eq 2428 H.323 MGCP

  14. MCQ Classification Options • Besides NBAR and ACLs, these major MQC classification options can be used for tuning. • These classification options can be used in any combination as needed to meet specific classification requirements. router(config-cmap)# match input-interface interface-name match cos cos-value [cos-valuecos-valuecos-value] match ip precedence ip-prec-value [ip-prec ...] match ip dscp ip-dscp-value [ip-dscp-value ...] match ip rtp starting-port-numberport-range

  15. Self Check • What are some common issues when using Cisco AutoQoS to generate enterprise policies? • When is manual Modification of AutoQoS configuration required?

  16. Summary • Cisco AutoQoS automates QoS deployment for the most common enterprise scenarios and enables several Cisco IOS QoS mechanisms to meet the QoS requirements of various applications and traffic types discovered in the enterprise network. • Cisco AutoQoS automatically provisions six QoS mechanisms using DiffServ technology: Classification, Marking, Congestion Management, Shaping, Congestion Avoidance, and Link Efficiency. • Although Cisco AutoQoS automates QoS deployment, it targets only the most common enterprise network scenarios. The QoS classes and templates that Cisco AutoQoS generates will not suit every network requirement.

  17. Q and A

  18. Resources • Cisco AutoQoS Introduction • http://cisco.com/en/US/partner/products/ps6656/products_ios_protocol_option_home.html • Cisco AutoQoS Q&A • http://cisco.com/en/US/partner/tech/tk543/tk759/tk879/technologies_q_and_a_item0900aecd8020a589.shtml

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