Enterprise QoS Solution Reference Network Design Guide

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Branch WAN Edge QoS Design 4-4 Enterprise QoS Solution Reference Network Design Guide Chapter 4 Branch Router QoS Design The AutoQoS for the Enterprise feature consists of two configuration phases, completed in the following order: 1. Auto-Discovery (data collection)—The Auto-Discovery phase can be configured to operate in one of two modes: – Untrusted Mode—In untrusted mode (configured using the auto discovery qos interface command), the Auto-Discovery phase uses NBAR protocol discovery to detect the applications on the network and performs statistical analysis on the network traffic. – Trusted Mode—In trusted mode (configured using the auto discovery qos trust interface command), the Auto-Discovery phase classifies packets based on DSCP values in the IP header and collects the statistics to calculate bandwidth and average rate/peak rate and passes that data to the template module. 2. AutoQoS Template Generation and Installation—This phase (configured using the auto qos command) generates templates from the data collected during the Auto-Discovery phase and installs the templates on the interface. These templates are then used as the basis for creating the class maps and policy maps for your network. After the class maps and policy maps are created, they are then installed on the interface. AutoQoS— Enterprise discovers and classifies as many as 10 classes of traffic, based on the QoS Baseline model. The only traffic class not automatically detected and classified is the Mission-Critical Data class, as this class requires a subjective evaluation on relative business priority vis-à-vis other Transactional/Interactive Data applications (as described in Chapter 1, “Quality of Service Design Overview”). These AutoQoS classes are described in Table 4-1. Table 4-1 AutoQoS for the Enterprise Feature Class Definitions AutoQoS Class Name Traffic Type DSCP Value IP Routing Network control traffic, such as routing protocols CS6 Interactive Voice Inactive voice-bearer traffic EF Interactive Video Interactive video data traffic AF41 Streaming Video Streaming media traffic CS4 Telephony Signaling Telephony signaling and control traffic CS3 Transactional/Interactive Database applications transactional in nature AF21 Network Management Network management traffic CS2 Bulk Data Bulk data transfers; web traffic; general data service AF11 Scavenger Casual entertainment; rogue traffic; traffic in this category is given less-than-best-effort treatment CS1 Best Effort Default class; all non-critical traffic; HTTP; all miscellaneous traffic 0 Additionally, the AutoQoS—Enterprise feature includes the following verification commands: show auto discovery qos show auto qos The top-level processes for configuring and verifying the AutoQoS—Enterprise feature are illustrated in Figure 4-2. Version 3.3
Chapter 4 Branch Router QoS Design Version 3.3 Branch WAN Edge QoS Design Figure 4-2 Top-Level Processes for Configuring the AutoQoS for the Enterprise Feature As noted, the AutoQoS— Enterprise feature is a handy alternative for automating QoS deployment in smaller WAN/Branch environments. For more information, see the IOS documentation: http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_11/ft_aqose.ht m If, on the other hand, all or some of the branch QoS policies must be defined manually, then additional considerations must be taken into account, as discussed below. Unidirectional Applications Some applications are completely symmetrical and require identical bandwidth provisioning on both ends of the WAN link. For example, if 100 kbps of LLQ are assigned to voice in one direction, 100 kbps of LLQ also must be provisioned for voice in the opposite direction (assuming that the same VoIP codecs are being used in both directions, and putting aside for a moment multicast Music-on-Hold [MoH] provisioning). Furthermore, having symmetrical polices on both sides of the WAN links greatly simplifies QoS policy deployment and management, which is an important aspect of large-scale designs. However, certain applications, such as Streaming-Video and multicast MoH, most often are unidirectional. Therefore, it might be unnecessary and even inefficient to provision any bandwidth guarantees for such traffic on the branch router for the branch-to-campus direction of traffic flow. Most applications lie somewhere in the middle of the scale, between the extremes of being fully bidirectional and being completely unidirectional. Most client/server applications lie closer to the unidirectional end of the scale because these applications usually consist of small amounts of client-to-server traffic coupled with larger amounts of server-to-client traffic. Such behavior can be reflected in the asymmetrical bandwidth provisioning for such types of applications. For purely unidirectional applications, it is recommended that provisioning be removed from the WAN edge policies on branch routers and the allocated bandwidth be redistributed among other classes. Enterprise QoS Solution Reference Network Design Guide 4-5
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Enterprise QoS Solution Reference Network Design Guide

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