Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
The module describes one approach to handling congested links; compression. It discusses link efficiency mechanisms that either compress the payload of packets (Stacker and Predictor) or reduce packet overhead by compressing their headers (TCP and RTP header compression). It also discusses two different layer-2 link fragmentation mechanisms (PPP Multilink and Frame Relay Fragmentation). | 6 Link Efficiency Mechanisms Overview The module describes one approach to handling congested links compression. It discusses link efficiency mechanisms that either compress the payload of packets Stacker and Predictor or reduce packet overhead by compressing their headers TCP and RTP header compression . It also discusses two different layer-2 link fragmentation mechanisms PPP Multilink and Frame Relay Fragmentation . Objectives Upon completion of this module you will be able to perform the following tasks Describe and configure Stacker payload compression Describe and configure Predictor payload compression Describe and configure TCP header compression Describe and configure RTP header compression Describe and configure PPP Multilink with interleaving Describe and configure Frame Relay Fragmentation Payload Compression Overview This lesson describes two payload compression mechanisms. It describes the Stacker and Predictor mechanisms that can be used to reduce the size of data in packets or frames. Objectives Upon completion of this lesson you will be able to perform the following tasks Describe and configure Stacker compression Describe and configure Predictor compression Monitor and troubleshoot compression 6-2 IP QoS Link Efficiency Mechanisms Copyright 2001 Cisco Systems Inc. Payload Compression QoS does not create bandwidth. Payload compression does. Payload compression uses a compression algorithm to squeeze the payload of layer-2 frames Payload compression increases perceived throughput and decreases perceived latency 2001 Cisco Systems Inc. IP QoS Link Efficiency Mechanisms -5 While many mechanisms exist for optimizing throughput and reducing delay in network traffic within the QoS portfolio QoS does not create bandwidth. QoS optimizes the use of existing resources and enables the differentiation of traffic according to the operator policy. Payload compression does create additional bandwidth because it squeezes packet payloads and therefore increases the
