Cajun P550 Switch Overview

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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Cajun P550/P220 Switch Operation Guide