TAILIEUCHUNG - IP over ATM

The Internet Protocol (IP) is a routed protocol that is used to transmit data in packets. It uses the best-effort delivery for individual packets without any flow control. Transmission Control Protocol (TCP) is used with IP to provide a connection-oriented service. Asynchronous Transfer Mode (ATM), on the other hand, provides connections between endpoints in the ATM network. The connections are called virtual circuits (VCs). IP’s default best effort service can be supplemented by differentiated quality of service based on IP precedence or DSCP marking. A QoS solution using IP precedence is limited to 8 classes, 2 of which are reserved and 1 should be used for the default best-effort class | 10 IP over ATM Overview This module focuses on IP QoS mechanisms that can be used on ATM interfaces. It includes the following topics Introduction to IP over ATM Per-VC WRED VC Bundling Per-VC CB-WFQ RSVP to SVC Mapping Objectives Upon completion of this module you will be able to perform the following tasks List the requirements of IP QoS in combination with ATM QoS Describe the hardware and software requirements for advanced IP QoS mechanisms on ATM interfaces Describe per-VC queuing Describe and configure per-VC WRED Describe and configure VC bundling Describe and configure per-VC CB-WFQ Describe RSVP to SVC mapping Monitor and troubleshoot IP QoS on ATM interfaces Introduction to IP over ATM Objectives Upon completion of this lesson you will be able to perform the following tasks Describe the QoS-related problems when using ATM networks Describe the hardware and software requirements for advanced IP QoS mechanisms on ATM interfaces Describe per-VC queuing 10-2 IP QoS IP over ATM Copyright 2001 Cisco Systems Inc. IP vs. ị ATM Technology comparison IP ATM Connectionless Per-packet QoS IP precedence Small number of service classes Connection oriented Per-connection virtual circuit QoS Large number of QoS traffic classes CBR IP precedence or DSCP does not encode service parameters VBR UBR ABR Rich traffic parameters PCR MCR SCR . specified for each VC 2001 Cisco Systems Inc. t . t H Cfï . p qoS p over A1Mi The Internet Protocol IP is a routed protocol that is used to transmit data in packets. It uses the best-effort delivery for individual packets without any flow control. Transmission Control Protocol TCP is used with IP to provide a connection-oriented service. Asynchronous Transfer Mode ATM on the other hand provides connections between endpoints in the ATM network. The connections are called virtual circuits VCs . IP s default best effort service can be supplemented by differentiated quality of service based on IP precedence or DSCP marking. A QoS .

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