Medianet Reference Guide - Cisco

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Enterprise Medianet Strategic QoS Recommendations Chapter 4 Medianet QoS Design Considerations Figure 4-25 Enterprise Medianet QoS Recommendations Application Class Per-Hop Behavior Admission Control Queuing and Dropping Media Application Examples VoIP Telephony EF Required Priority Queue (PQ) Cisco IP Phones (G.711, G.729) Broadcast Video CS5 Required (Optional) PQ Cisco IP Video Surveillance/Cisco Enterprise TV Real-Time Interactive CS4 Required (Optional) PQ Cisco TelePresence Multimedia Conferencing AF4 Required BW Queue + DSCP WRED Cisco Unified Personal Communicator Multimedia Streaming AF3 Recommended BW Queue + DSCP WRED Cisco Digital Media System (VoDs) Network Control CS6 BW Queue EIGRP, OSPF, BGP, HSRP, IKE Signaling CS3 BW Queue SCCP, SIP, H.323 Ops/Admin/Mgmt (OAM) CS2 BW Queue SNMP, SSH, Syslog Transactional Data AF2 BW Queue + DSCP WRED Cisco WebEx/MeetingPlace/ERP Apps Bulk Data AF1 BW Queue + DSCP WRED E-mail, FTP, Backup Apps, Content Distribution Best Effort DF Default Queue + RED Default Class Scavenger CS1 Min BW Queue YouTube, iTunes, BitTorrent, Xbox Live 224550 The 12 classes of applications within this enterprise medianet QoS model—which have unique service level requirements and thus require explicit QoS PHBs—are outlined as follows: • VoIP Telephony • Broadcast Video • Realtime Interactive • Multimedia Conferencing • Network Control • Signaling • Operations, Administration, and Management (OAM) • Transactional Data and Low-Latency Data • Bulk Data and High-Throughput Data • Best Effort • Scavenger and Low-Priority Data VoIP Telephony This service class is intended for VoIP telephony (bearer-only) traffic (VoIP signaling traffic is assigned to the Call Signaling class). Traffic assigned to this class should be marked EF (DSCP 46) and should be admission controlled. This class is provisioned with an Expedited Forwarding Per-Hop Behavior. The EF PHB-defined in RFC 3246-is a strict-priority queuing service and as such, admission to this class should be controlled. Example traffic includes G.711 and G.729a. 4-32 Medianet Reference Guide OL-22201-01
Chapter 4 Medianet QoS Design Considerations Enterprise Medianet Strategic QoS Recommendations Broadcast Video This service class is intended for broadcast TV, live events, video surveillance flows, and similar “inelastic” streaming media flows (“inelastic” flows refer to flows that are highly drop sensitive and have no retransmission and/or flow-control capabilities). Traffic in this class should be marked Class Selector 5 (CS5/DSCP 40) and may be provisioned with an EF PHB; as such, admission to this class should be controlled (either by an explicit admission control mechanisms or by explicit bandwidth provisioning). Examples traffic includes live Cisco Digital Media System (DMS) streams to desktops or to Cisco Digital Media Players (DMPs), live Cisco Enterprise TV (ETV) streams, and Cisco IP Video Surveillance (IPVS). Realtime Interactive This service class is intended for inelastic high-definition interactive video applications and is intended primarily for audio and video components of these applications. Whenever technically possible and administratively feasible, data sub-components of this class can be separated out and assigned to the Transactional Data traffic class. Traffic in this class should be marked CS4 (DSCP 32) and may be provisioned with an EF PHB; as such, admission to this class should be controlled. An example application is Cisco TelePresence. Multimedia Conferencing This service class is intended for desktop software multimedia collaboration applications and is intended primarily for audio and video components of these applications. Whenever technically possible and administratively feasible, data sub-components of this class can be separated out and assigned to the Transactional Data traffic class. Traffic in this class should be marked Assured Forwarding Class 4 (AF41/DSCP 34) and should be provisioned with a guaranteed bandwidth queue with DSCP-based Weighted-Random Early Detect (DSCP-WRED) enabled. Admission to this class should be controlled; additionally, traffic in this class may be subject to policing and re-marking. Example applications include Cisco Unified Personal Communicator, Cisco Unified Video Advantage, and the Cisco Unified IP Phone 7985G. Network Control This service class is intended for network control plane traffic, which is required for reliable operation of the enterprise network. Traffic in this class should be marked CS6 (DSCP 48) and provisioned with a (moderate, but dedicated) guaranteed bandwidth queue. WRED should not be enabled on this class, as network control traffic should not be dropped (if this class is experiencing drops, then the bandwidth allocated to it should be re-provisioned). Example traffic includes EIGRP, OSPF, BGP, HSRP, IKE, etc. Signaling This service class is intended for signaling traffic that supports IP voice and video telephony; essentially, this traffic is control plane traffic for the voice and video telephony infrastructure. Traffic in this class should be marked CS3 (DSCP 24) and provisioned with a (moderate, but dedicated) guaranteed bandwidth queue. WRED should not be enabled on this class, as signaling traffic should not be dropped (if this class is experiencing drops, then the bandwidth allocated to it should be re-provisioned). Example traffic includes SCCP, SIP, H.323, etc. OL-22201-01 Medianet Reference Guide 4-33
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About the Authors Solution Authors
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Contents Application Intelligence a
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Contents The Globalization of the W
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Contents NetFlow Collector Consider
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Business Drivers for Media Applicat
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Business Drivers for Media Applicat
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Related Documents Chapter 1 Mediane
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