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© 2002, Cisco Systems, Inc. All rights reserved.

AutoQoS Technical Presentation, 1/03. 1. 1. 1. © 2002, Cisco Systems, Inc. All rights reserved. Cisco AutoQoS Technical Presentation . Ramya Venkatraman Technical Marketing Engineer – QoS Internet Technologies Group. Agenda. Introduction Cisco AutoQoS Framework

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© 2002, Cisco Systems, Inc. All rights reserved.

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  1. AutoQoS Technical Presentation, 1/03 1 1 1 © 2002, Cisco Systems, Inc. All rights reserved.

  2. Cisco AutoQoS Technical Presentation Ramya VenkatramanTechnical Marketing Engineer – QoSInternet Technologies Group

  3. Agenda • Introduction • Cisco AutoQoS Framework • Automation with Cisco AutoQoS • AutoQoS Deployment Case Study • Summary Introduction

  4. Introduction –IETF DiffServ Architecture (RFC-2475) • The idea: different service levels for packets • The service: some significant characteristics of packet transmission in one direction across the network Examples: bandwidth and latency

  5. A New Paradigm for Automating the Delivery of Network Quality of Service • Key Takeaways: • Simpler QoS deployments – Reduces operator errors • Cheaper QoS deployments – Up to 2/3rds reduction in cost • Faster QoS deployments – Up to 2/3rds reduction in deployment time • Cisco AutoQoS initial focus: QoS for Voice over IP • IP Telephony is here! • IP Telephony requires QoS • QoS deployment can be challenging • Cisco AutoQoS makes VoIP deployments simpler, cheaper, and faster • Cisco AutoQoS retains 100% customer control over configuration

  6. Cisco QoS Introduction:A Complete Diffserv Toolkit Classification (CoS, DSCP, ACLs, VLAN, Port-based) SWITCH Classification (CoS, DSCP, ACLs, VLAN, Port-based) PROVISIONING & MONITORING CBQoSMIB, QPM 3.0 Buffer Management & WRED Queuing & Scheduling (WRR, PQ) Policing & Marking (Aggregate & Micro Flow Policing) ROUTER Classification & Marking (DSCP, IP Precedence, nBAR, etc.) Congestion Avoidance Mechanisms (WRED, WRED-ECN) Traffic Conditioners (Policing, Shaping) Congestion Management Techniques (WFQ,CBWFQ,LLQ) Link Efficiency Mechanisms (Compression, Fragmentation) FRAME RELAY PPP HDLC ATM GE FE

  7. Agenda • Introduction • Cisco AutoQoS Framework • Automation with Cisco AutoQoS • AutoQoS Deployment Case Study • Summary Cisco AutoQoS Framework

  8. Cisco AutoQoS - VoIP FrameworkDiffServ Functions Automated • Automation and simplification of the existing user interface to expedite deployment of QoS features for VoIP • Fine-tuning of AutoQoS generated parameters by user, if desired

  9. Link Utilization Citrix 25% Netshow 15% Fasttrack 10% FTP 30% HTTP 20% Cisco AutoQoS Framework –Network Based Application Recognition What Applications are running through my network? • Benefits • Identifies Layer 4 to Layer 7 applications and protocols • Stateful & deep packet inspection • Protocol Discovery analyzes application traffic patterns in real time and identifies traffic is running on the network • Platform Support • Cisco 1700, 2600, 3600, 7100, 7200, FlexWan Series Routers • Switches: MSFC support on Sup 1a & Sup 2 introduced in Release 12.1(13)E

  10. Cisco AutoQoS Framework –nBAR RTP Payload Type Classification • Eases classification of voice and video traffic • VoIP, streaming / real time video, audio / video conferencing, Fax Over IP • Distinguishes betweenRTP packets based on payload type and CODECS • Removes dependencies on UDP Port Range & DSCP markings

  11. Cisco AutoQoS Framework –Percentage Based Policies • Problems • Fixed CIR imposes scalability issues • Service policies differ by interface, with a wide range of interface bandwidths • Solution • Configure policies as a percentage of available bandwidth • Advantage • Increased Scalability & Manageability Same Policy Map can be applied on multiple interfaces and on interfaces with varying bandwidth Build Once, Apply Many Policies

  12. 56kb WAN Cisco AutoQoS Framework –MLPPP Link Fragmentation & Interleaving Problem: large packets “freeze out” voice Voice Packet 60 bytes Every 20 ms Voice Packet 60 bytes Every >214 ms Voice Packet 60 bytes Every >214 ms ~214ms Serialization Delay Voice 1500 Data Bytes Voice Voice 1500 Data Bytes Voice Voice 1500 Data Bytes Voice 10mbps Ethernet 10mbps Ethernet • Implemented via Multilink PPP (MLP) over FR, ATM, and leased lines • Fragments are interleaved with the real-time packets, reducing the Serialization delay experienced by Voice packets Benefit: reduce the jitter in voice calls

  13. Cisco AutoQoS Framework –RTP Header Compression

  14. Agenda • Introduction • Cisco AutoQoS Framework • Automation with Cisco AutoQoS • AutoQoS Deployment Case Study • Summary Automation with Cisco AutoQoS

  15. Automation with Cisco AutoQoS – VoIP Intelligence in the LAN Building Building Building Access Layer 2 Switch Distribution Layer 3 Switch Core Layer 3 Switched Backbone Server Farm Server Farm • Enable Trust boundary (phone, access, uplink/downlink) • Enable Priority Queuing where required • Modify Queue Admission criteria where required • Configure CoS to DSCP and IP Prec to DSCP maps where required

  16. Automation with Cisco AutoQoS – VoIP Intelligence in the WAN WAN 125 Remote Sites • Build MQC based policies for VoIP • Intelligent Classification (Trust / Untrust) • High Speed & Low Speed QoS Policies • Automatically enable QoS features specific to underlying transport protocol (FR, ATM, PPP, FR-to-ATM) • Enable Traffic Shaping where required • Enable LFI (FRF.12, MLP) where required • Enable CRTP • Monitoring & SNMP Alerts

  17. Cisco AutoQoS BenefitsRouter Platforms Cisco 2600, 2600-XM, 3600, 3700, and 7200 Series Routers • User can meet the voice QoS requirements without extensive knowledge about: • Underlying technologies (i.e.: PPP, FR, ATM) • Service policies • Link efficiency mechanisms • AutoQoS lends itself to tuning of all generated parameters & configurations

  18. Automation with Cisco AutoQoSRouter Platforms • Supported on serial (PPP & HDLC), ATM PVCs, FR DLCIs and FR/ATM links • Only on point-to-point sub-interfaces for FR and low speed ATM PVCs • Policies are specific to underlying transport layer protocol • Automatically identifies H.323, MGCP, H.225 (Unicast), SIP and Skinny Signaling Protocols • Command Line Interface • auto qos voip [trust] – Untrusted Mode by default • auto qos voip [fr-atm] – Enabled on FR DLCI for FR/ATM Interworking

  19. Automation with Cisco AutoQoSRouter Platforms (Cont) • Classification • Trust: relies on DSCP markings from switches (DSCP EF & AF31) • Un trust: nBAR RTP Payload Type Classification & Access Lists • Provisioning • LLQ protects voice bearer and voice signaling traffic • WFQ shares bandwidth fairly in the Best Effort Data class • Policy Generation • Enables high- (>768Kbps) and low- (<=768Kbps) speed QoS • Monitoring • SNMP monitoring events are reported if the SNMP server is enabled • Thresholds activated in RMON alarm table to monitor LLQ drops

  20. Frame Relay Automation with Cisco AutoQoSRouter Platforms (Cont) Without AutoQoS Configuring QoS for VoIP on Low Speed Frame Relay WAN Link class-map VoIP-Bearer match protocol rtp audio class-map VoIP-Control match access-group 101 ! policy-map QoS-Policy class VoIP-Bearer priority percent 30 set ip dscp ef class VoIP-Control bandwidth percent 5 set ip dscp af31 class class-default fair-queue ! Access-list 101 permit tcp any any eq 1720 \\H.323 Access-list 101 permit tcp any any range 11000 11999 \\H.323 Access-list 101 permit udp any any eq 2427 \\MGCP Access-list 101 permit udp any any eq 2428 \\MGCP Access-list 101 permit tcp any any range 2000 2002 \\ Skinny Classify the traffic of interest for QoS Policy Define QoS Policy Treatment Define ACLs to classify VoIP Signaling

  21. Frame Relay Automation with Cisco AutoQoSRouter Platforms (Cont) Without AutoQoS Enabling FRTS, FRF.12 & CRTP interface Serial4/0 encapsulation frame-relay frame-relay traffic-shaping ! interface Serial4/0.1 point-to-point bandwidth 256 ip address 10.1.71.1 255.255.255.0 frame-relay interface-dlci 100 class VoIP Frame-relay ip rtp header-compression ! map-class frame-relay VoIP frame-relay cir 256000 frame-relay bc 2560 frame-relay be 0 frame-relay mincir 256000 service-policy output QoS-Policy frame-relay fragment 320 Enable Frame Relay Traffic Shaping Apply FR class-map to DLCI Enable RTP Header Compression Frame Relay Traffic Shaping Apply QoS Policy Enable FRF.12

  22. Frame Relay Automation with Cisco AutoQoSRouter Platforms (Cont) With AutoQoS FRTS enabled by AutoQoS interface Serial4/0 encapsulation frame-relay frame-relay traffic-shaping ! interface Serial4/0.1 point-to-point bandwidth 256 ip address 10.1.71.1 255.255.255.0 frame-relay interface-dlci 100 class AutoQoS-VoIP-FR-Serial4/0-100 auto qos voip frame-relay ip rtp header-compression ! map-class frame-relay AutoQoS-VoIP-FR-Serial4/0-100 frame-relay cir 256000 frame-relay bc 2560 frame-relay be 0 frame-relay mincir 256000 service-policy output AutoQoS-Policy-UnTrust frame-relay fragment 320 You specify BW, IP Addr & FR DLCI You enable AutoQoS CRTP configuration generated by AutoQoS FRTS & FRF.12 settings generated by AutoQoS

  23. Frame Relay Automation with Cisco AutoQoSRouter Platforms (Cont) With AutoQoS class-map match-any AutoQoS-VoIP-RTP-Untrust match protocol rtp audio match access-group name AutoQoS-VOIP-RTCP class-map AutoQoS-VoIP-Control-Untrust match access-group name AutoQoS-VOIP-Control class-map match-any AutoQoS-VOIP-Remark match ip dscp ef match ip dscp af31 ! policy-map AutoQoS-Policy-Untrust class-map AutoQoS-VoIP-RTP-Untrust priority percent 70 set dscp ef class AutoQoS-VoIP-Control-Untrust bandwidth percent 5 set dscp af31 class AutoQoS-VoIP-Remark set dscp default class class-default fair-queue Classification done by AutoQoS Provisioning done by AutoQoS

  24. Frame Relay Automation with Cisco AutoQoSRouter Platforms (Cont) With AutoQoS Monitoring Drops in LLQ • Thresholds are activated in RMON alarm • table to monitor drops in Voice Class • Default drop threshold is 1bps • 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 RMON event configured generated by AutoQoS

  25. Cisco AutoQoS BenefitsSwitch Platforms Cisco Catalyst 6500, 4500, 3550, and 2950EI Switches • User can meet the voice QoS requirements without extensive knowledge about: • Trust boundary • CoS to DSCP mappings • Weighted Round Robin (WRR) & Priority Queue (PQ) Scheduling parameters • Generated parameters and configurations are user tunable

  26. Automation with Cisco AutoQoSSwitch Platforms • Single command at the interface level configures interface and global QoS • Support for Cisco IP Phone & Cisco Soft Phone • Support for Cisco Soft Phone currently exists only on the Cat6500 • Trust Boundary is disabled when IP Phone is moved / relocated • Buffer Allocation & Egress Queuing dependent on interface type (GE/FE) • Supported on Static, dynamic-access, voice VLAN access, and trunk ports • CDP must be enabled for AutoQoS to function properly • Cisco Catalyst 2950 EI supports WRR, Strict Priority Scheduling, and Strict Priority Queuing

  27. Automation with Cisco AutoQoSSwitch Platforms (Cont) Command Line Interface • Cisco Catalyst 6500 Switch • Global: set qos autoqos • Interface: set port qos autoqos <mod/port> voip [ciscosoftphone | ciscoipphone] • Trust Boundary: Set port qos autoqos <mod/port> trust [cos|dscp] • Cisco Catalyst 3550 and 2950EI Switches • auto qos voip trust – QoS Labels in ingress packets are trusted • auto qos voip Cisco-phone – Extends trust boundary if IP Phone detected • Cisco Catalyst 4500 Switch • Similar to Cat 3550/2950

  28. 6500 6500 6500 6500 6500 Automation with Cisco AutoQoSSwitch Platforms (Cont) Without AutoQoS Configuring QoS for VoIP on Trusted & Untrusted Ports in the LAN set qos enable set port qos mod/port cos 0 set port qos mod/port cos-ext 0 set port qos mod/port trust-ext untrusted set port qos mod/port trust-device ciscoipphone set qos acl ip ACL_IP-PHONES trust-cos any commit qos acl ACL_IP-PHONES set qos acl map ACL_IP-PHONES mode/port set port qos mod/port trust trust-cos set qos ipprec-dscp-map 0 10 18 26 34 46 48 56 set qos cos-dscp-map 0 10 18 26 34 46 48 56 set qos map 2q2t tx queue 2 2 cos 5,6,7 .............

  29. 6500 6500 6500 6500 6500 Automation with Cisco AutoQoSCisco Catalyst 6500 Series Switch With AutoQoS User enables AutoQoS set port macro 4/1 ciscoipphone 10 110 Port 4/1 has been fully configured for ciscoipphone. Data vlan set to 10, auxiliary vlan set to 110, port based autoqos configured. Global autoqos configured on all ports. set qos autoqos All ingress and egress QoS scheduling parameters configured on all ports.CoS to DSCP, DSCP to COS and IP Precedence to DSCP maps configured.Global QoS configured set port qos autoqos 4/1 voip ciscoipphone Port 4/1 has been fully configured for voip.Global autoqos configured on all ports Generated by AutoQoS Generated by AutoQoS

  30. 6500 6500 3500 3500 3500 Automation with Cisco AutoQoSCisco Catalyst 3550 Series Switch Without AutoQoS Configuring QoS for VoIP on Trusted Ports in the LAN mls qos map cos-dscp 0 10 18 26 34 46 48 56 mls qos ! interface FastEthernet0/1 Description to IP Phone mls qos trust CoS wrr-queue cos-map 4 5 priority-queue out switchport voice vlan 111 switchport access vlan 11 switchport priority extend cos 0 Map CoS Values in incoming packets to DSCP values Ingress Classification set to trust CoS value received in the packet Assign packets with CoS 5 to Queue 4 (Expedite Queue) Enable Egress Expedite Queue Enable Trust Boundary on the phone

  31. 6500 6500 3500 3500 3500 Automation with Cisco AutoQoSCisco Catalyst 3550 Series Switch With AutoQoS Interface FastEthernet0/1 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone wrr-queue bandwidth 20 1 80 0 wrr-queue min-reserve 1 5 wrr-queue min-reserve 2 6 wrr-queue min-reserve 3 7 wrr-queue min-reserve 4 8 wrr-queue cos-map 1 0 1 2 4 wrr-queue cos-map 3 3 6 7 wrr-queue cos-map 4 5 priority-queue out You enable AutoQoS Generated by AutoQoS Interface GigabitEthernet0/1 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone wrr-queue bandwidth 20 1 80 0 wrr-queue queue-limit 80 1 20 1 wrr-queue cos-map 1 0 1 2 4 wrr-queue cos-map 3 3 6 7 wrr-queue cos-map 4 5 priority-queue out You enable AutoQoS Generated by AutoQoS

  32. 6500 6500 3500 3500 3500 Automation with Cisco AutoQoSCisco Catalyst 2950EI Series Switch Without AutoQoS Configuring QoS for VoIP on Trusted & Untrusted Ports in the LAN mls qos mls qos map cos-dscp 0 10 18 26 34 46 48 56 wrr-queue cos-map 1 0 1 2 4 wrr-queue cos-map 3 3 6 7 wrr-queue cos-map 4 5 wrr-queue bandwidth 20 1 80 0 ! Interface GigabitEthernet0/1 Description Uplink to Trusted Source mls qos trust dscp ! interface FastEthernet0/1 Description to IP Phone mls qos trust CoS switchport voice vlan 111 switchport access vlan 11 switchport priority extend cos 0 Map CoS Values in incoming packets to DSCP values Assign packets with CoS 5 to Queue 4 (Expedite Queue) Ingress Classification set to trust CoS value received in the packet Enable Trust Boundary on the phone

  33. 6500 6500 3500 3500 3500 Automation with Cisco AutoQoSCisco Catalyst 2950EI Series Switch With AutoQoS mls qos map cos-dscp 0 8 16 26 32 46 48 56 wrr-queue bandwidth 20 1 80 0 no wrr-queue cos-map wrr-queue cos-map 1 0 1 2 4 wrr-queue cos-map 3 3 6 7 wrr-queue cos-map 4 5 ! interface GigabitEthernet0/2 auto qos voip trust mls qos trust cos ! Interface FastEthernet0/1 auto qos voip cisco-phone mls qos trust device cisco-phone Generated by AutoQoS You enable AutoQoS auto qos voip trust auto qos voip cisco-phone

  34. Agenda • Introduction • Cisco AutoQoS Framework • Automation with Cisco AutoQoS • AutoQoS Deployment Case Study • Summary AutoQoS Deployment Case Study

  35. QoS Deployment for VoIP Goal: Deploy consistent, end-to-end QoS for VoIP WAN Distribution Layer WAN Access Layer Intelligent Classification Bandwidth Provisioning Admission Control Shaping Link Fragmentation & Interleaving Header Compression Classification & Trust Boundary Marking / Remarking Egress Queue Scheduling Buffer Management Layer 3 Policing Egress Scheduling (Multiple Queues with WRR) Priority Queuing for VOIP Buffer Management

  36. Application Classification Consistency Monitoring & Reporting Policy Generation Configuration QoS Deployment for VoIP –Without AutoQoS • Identify Traffic of Interest • Trust & Untrust • Consistent end-to-end QoS across LAN & WAN • Platform Consistency • Link Efficiency Mechanisms • CoS to DSCP to Queue mapping • WRR & WRED parameters • Transport specific features Key Elements of QoS Deployment • Monitor the performance of Voice traffic • Classes • Bandwidth requirements • High Speed Vs Low Speed QoS • Buffer Management

  37. QoS Deployment for VoIP –Manual Approach without AutoQoS In the WAN • Identify applications and protocols of interest Untrusted edge vs. trusted edge • Remark traffic based on classification • Determine how many classes should be configured, and what queuing should be enabled • Determine class bandwidth requirements • Configure transport specific features Traffic Shaping, MLPPP & TX-Ring settings • Enable bandwidth specific QoS features Header Compression & Fragmentation Settings (MLP/LFI or FRF.12) • Configure alarm and event settings for monitoring purposes

  38. QoS Deployment for VoIP –Manual Approach without AutoQoS In the LAN • Identify Trust Boundary & Extended Trust Boundary • Remark traffic based on classification • Determine CoS to DSCP and IP Precedence to DSCP mappings • Map CoS values to the different egress queues • Queue Size Settings & WRR weights FE Vs GE ports • Determine CoS to Egress queue mapping • Configure QoS on a per port basis

  39. QoS Deployment for VoIP– Automation with Cisco AutoQoS (Phase I) Evaluate Network Environment & Generate Initial Policy Identify VoIP Bearer & Control Traffic VoIP Packet Drop Alerts CBQoSMIB Support One Command Full LAN & WAN Interoperability Monitoring Consistency Traffic Classification Policy Generation Provisioning Accomplish all of the above in just 4 steps • Configure Interface / Sub-Interface Bandwidth • Configure IP Address • Enable AutoQoS (Trust Vs Un Trust) • Fine Tune Parameters, if required

  40. QoS Deployment for VoIP - Single Step Approach Using Cisco AutoQoS In the LAN Enable Cisco AutoQoS for VoIP on the switch • Cisco Catalyst 2950 and 3550 Switches: enable Auto QoS on the interface • auto qos voip [trust | cisco-phone] • Cisco Catalyst 6500 Switch: enable Auto QoS on the port • set qos autoqos • set port qos autoqos <mod/port> voip [ciscosoftphone | ciscoipphone] • set port qos autoqos <mod/port> trust [cos|dscp] • Parameter Tuning Monitor Cisco AutoQoS on the Switch • sh mls qos interface <x> [buffers | queuing] • (above command not supported on 2950) • show mls qos maps cos-dscp • show auto qos interface <x>

  41. QoS Deployment for VoIP - Single Step Approach Using Cisco AutoQoS (Cont) In the WAN Enable Cisco AutoQoS for VoIP via Router CLI • Configure IP address on interface or sub interface • Configure bandwidth on interface or sub interface • Enable “autoqos voip [ trust | fr-atm ]” on PVC, DLCI or interface • Parameter tuning & Configuration modifications Monitor Cisco AutoQoS on the Router • show policy-map interface <x> • show auto qos [interface <interface type>] • show rmon [alarms | events] Monitor Cisco AutoQoS using QPM 3.0

  42. QoS Deployment for VoIP –Class-Based QoS MIB (CBQoSMIB) • Provides read access to configuration and statistical information for MQC based QoS Policies • Provides MQC configuration information and application statistics • Provides CBQoS statistics on a per-policy/per-interface or PVC basis • Monitor pre- and post-policy bit rates on a device Interface 2 Inbound Policy Interface 1 Outbound Policy SNMP Interface 3 Inbound Policy CBQoSMIB Provide CBQoS Statistics & Configuration Information Per policy ftp://ftp.cisco.com/pub/mibs/v2/CISCO-CLASS-BASED-QOS-MIB.my

  43. interface Multilink1 ip address 10.1.61.1 255.255.255.0 ip tcp header-compression iphc-format load-interval 30 service-policy output QoS-Policy ppp multilink ppp multilink fragment-delay 10 ppp multilink interleave interface Serial0 • bandwidth 256 • Ip address 10.1.61.1 255.255.255.0 • auto qos voip QoS Deployment for VoIP – Monitoring & Reporting with QPM 3.0 CLI Cisco Works QoS Policy Manager • Central web based tool • QoS config guidance • Templates, customize • Deployment control • File export • Monitoring • Reports • Troubleshooting • Multi-device, global • Device-Based • Single Command • Intelligent Classification • Reporting via Syslog & Traps

  44. Bronze Silver Bronze Gold Silver Gold Bronze Silver QoS Deployment for VoIP - Monitoring and Reporting with CBQoSMIB & QPM 3.0 Before QOS After QOS Policies have been applied CMPrePolicyPkt CMPrePolicyByte CMPostPolicyPkt CMDropPkt CMDropByte CMNoBufDropPkt Drop=Pre- Post

  45. QoS Deployment for VoIP – An example using QPM 3.0

  46. Agenda • Introduction • Cisco AutoQoS Framework • Automation with Cisco AutoQoS • AutoQoS Deployment Case Study • Summary Summary

  47. Highlights –Cisco AutoQoS in the WAN • Simplifies QoS configuration for VoIP • Phase I – a single command enables Cisco QoS for VoIP • End-to-end simplification, automation, and intelligence • Classifies VoIP bearer and signaling (H.323, Skinny, H.225 Unicast, SIP & MGCP) traffic • Provisioning based on Cisco Best Practices • Generated parameters and configuration can be user modified

  48. Highlights –Cisco AutoQoS in the WAN (Cont) • Intelligent policy generation • Based on available bandwidth & underlying L2 technology • Enables IP RTP Header Compression and Frame Relay Traffic Shaping, if required • Decides on fragmentation settings (FRF.12, MLP/LFI), if required • Supported on FR, ATM, HDLC, PPP & FR-to-ATM links • Provides RMON alerts, if VoIP packet are dropped

  49. Highlights –Cisco AutoQoS in the LAN • Simplifies QoS configuration for VoIP • Phase I – a single command enables Cisco QoS for VoIP • Support for Cisco IP Phone & Cisco SoftPhone • Optimal Voice Performance • Parameters based on Cisco Best Practices, extensive lab testing, and input from a broad base of AVVID installations

  50. Highlights –Cisco AutoQoS in the LAN (Cont) • Intelligent Policy generation • Automatically decides on trust and extended trust boundary settings • User can bypass telephone and connect their PC directly to the switch • Disables trust when IP phone is relocated • Configures CoS to DSCP to Queue mapping • Decides on WRR settings • Supported on Static, Dynamic-access, voice VLAN, and trunk ports

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