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Only a single power supply is required for any module configuration in the switch, with the second power supply purely as a redundant, load-sharing backup.

This architecture is a store-and-forward operation, meaning that each frame is stored in a frame buffer before it is forwarded to the next port. Each port maintains its own 192 Kb of frame buffer memory. This architecture uses fair arbitration and address recognition logic for all modules. Each frame traversing the frame switching bus may be destined to a single port or to multiple ports, allowing for high-speed multicast forwarding without the need for frame copies.

The Catalyst 5500 maintains two additional buses, the management and index/control buses. The management bus is a serial bus that carries configuration information to each module and statistical information from each module to the Network Management Processor (NMP). The index/control bus carries port-select information from the central encoded address recognition logic to the ports. This information determines which ports forward the packet and which flush it from the buffer.

The architecture starts at 3.6 Gbps and scales to more than 25 Gbps of total switching capacity. This capacity is reached through a combination of local switching modules, with support for Gigabit Ethernet technology across modules in the chassis.

The high-speed crossbar frame switching fabric uses an input/output (I/O) queuing model. This cost-effective architecture gives the most efficient switching fabric for unicast and multicast/multimedia applications. Multiple 1.2-Gbps input buses into the 3.6-Gbps crossbar fabric ensure backward compatibility to existing Catalyst 5000 interface modules. This benefit is key for customers with existing Catalyst 5000 interface modules in the network. Gigabit interface modules support full access to the 3.6-Gbps fabric.

Overview

cisco router 5505

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