Lucent Technologies P550 Manuel d'utilisateur télécharger pdf (Page 34)

Cajun P550 Switch Overview

1-14 Cajun P550/P220 Switch Operation Guide

Buffer and Queue Management

Adding gigabit speeds to existing networks means that there can be a huge disparity

between link speeds. For example, anything more than a 1% load on a gigabit link could

easily overwhelm a 10 Mb/s Ethernet link.

Without queue and buffer management, gigabit links might only move congestion in a

network, rather than relieving it. The switch employs the following buffer and queue

management techniques:

❒ Configurable active backpressure:

• Half-duplex ports use active backpressure to jam input ports when their frame

buffers are full.

• Full-duplex links use IEEE 802.3z pause control frames to pause traffic when

buffers are full.

❒ Packed frame buffers for optimal memory utilization. The memory management

allows virtually 100% utilization of buffer memory.

❒ Two Class of Service priority queues that provide flexible queue management

algorithms to meet application requirements.

❒ Large buffer space:

• 512 KB per gigabit port.

• 128 KB additional for outbound 10/100 ports.

❒ Configurable queue depth for each of two prioritized packet queues.

❒ Configurable priority threshold.

Web-Based Management

Web-based management allows you to manage switches from any station connected to

your network.

The switch offers a command line interface and a rich set of web-based management

features:

❒ Reduced Instruction Set Computing- based (RISC) Supervisor provides high-speed

VLAN, RMON, and network management support.

❒ Web Agent: Built-in SNMP and HTML-based agent, compatible with popular Web

browsers, provides top-to-bottom switch management.

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Lucent Technologies P550 Manuel d'utilisateur Page 34