ZyXEL VMG1312-B10A User Guide - Page 149
Tagging and Marking, Traffic Shaping, Traffic Policing
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Chapter 10 Quality of Service (QoS) similar types of traffic together and treating each type as a class. You can use CoS to give different priorities to different packet types. CoS technologies include IEEE 802.1p layer 2 tagging and DiffServ (Differentiated Services or DS). IEEE 802.1p tagging makes use of three bits in the packet header, while DiffServ is a new protocol and defines a new DS field, which replaces the eight-bit ToS (Type of Service) field in the IP header. Tagging and Marking In a QoS class, you can configure whether to add or change the DSCP (DiffServ Code Point) value, IEEE 802.1p priority level and VLAN ID number in a matched packet. When the packet passes through a compatible network, the networking device, such as a backbone switch, can provide specific treatment or service based on the tag or marker. Traffic Shaping Bursty traffic may cause network congestion. Traffic shaping regulates packets to be transmitted with a pre-configured data transmission rate using buffers (or queues). Your Device uses the Token Bucket algorithm to allow a certain amount of large bursts while keeping a limit at the average rate. Traffic Rate Traffic Rate Traffic Traffic Time (Before Traffic Shaping) Time (After Traffic Shaping) Traffic Policing Traffic policing is the limiting of the input or output transmission rate of a class of traffic on the basis of user-defined criteria. Traffic policing methods measure traffic flows against user-defined criteria and identify it as either conforming, exceeding or violating the criteria. Traffic Rate Traffic Rate Traffic Traffic Time Time (Before Traffic Policing) (After Traffic Policing) The Device supports three incoming traffic metering algorithms: Token Bucket Filter (TBF), Single Rate Two Color Maker (srTCM), and Two Rate Two Color Marker (trTCM). You can specify actions VMG1312-B Series User's Guide 149