tailieunhanh - Classification and Marking

This module describes the mechanisms that are used to classify and mark IP packets. This module builds on the knowledge acquired from the introductory module where classification and marking is discussed. Theoretical knowledge is supplemented by detailing Policy-based routing (PBR) and QoS Policy Propagation through BGP (QPPB) mechanisms. | Classification and Marking Overview This module describes the mechanisms that are used to classify and mark IP packets. This module builds on the knowledge acquired from the introductory module where classification and marking is discussed. Theoretical knowledge is supplemented by detailing Policy-based routing PBR and QoS Policy Propagation through BGP QPPB mechanisms. Objectives Upon completion of this module you will be able to Describe Policy-based routing and how it is used to classify and mark IP packets Describe QoS Policy Propagation through BGP and how it is used to classify and mark IP packets List other mechanisms that also support classification and marking capabilities Committed Access Rate Class-based Policing and Class-based Marking Traffic Classification and Marking _ Classification Most QoS mechanisms in the Cisco IOS include some type of classification Some mechanisms classify packets automatically some require manual configuration Marking Only a small number of mechanisms also include a marking capability 2001 Cisco Systems Inc. . t K HJ . Classification and Marking-3 This module focuses on the QoS mechanisms that are used for classification and marking purposes only. Most QoS mechanisms include some type of classification but only a small number of mechanisms also include marking capability. Classification is the term used for identifying a Behavior Aggregate to which a packet belongs. A Behavior Aggregate is a collection of flows requiring the same quality of service. Marking is the term used for coloring packets by applying a class-identifying value to one of the following markers IP precedence DSCP QoS group value is local to a router MPLS experimental bits can be used only in MPLS-enabled networks ATM CLP bit value can be used only within ATM networks Frame Relay DE bit value can be used only within Frame Relay networks IEEE or ISL cos priority bits value can be used on within LAN-switched networks . 2-2 IP QoS .