Avaya P580 User Manual download pdf (Page 49)

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Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 1-21

Introduction

Extensive Fault Tolerance

All multiservice switches are designed to function as backbone

switches. You can install each switch in your network’s core without

creating a single point of failure.

Extensive fault tolerance features include:

■ N+1 power. Power supplies share the power supply load. If

one fails, the remaining supplie(s) assume the load

automatically and the switch management system warns of

the failure.

■ Hot-swappable fans and modules - Each fan and module can

be changed from the switch front panel, without powering

down the switch.

■ Redundant switch links (using spanning tree and link

aggregation groups).

■ Front-loadable cables, modules, power supplies and fans.

■ Redundant switch element and switch controller modules

(fault-tolerant switches only).

Buffer and Queue Management

Buffer and queue management relieves congestion in a network.

Adding gigabit speeds to existing networks means that there can be

a huge disparity between link speeds. For example, anything more

than a 1-percent load on a gigabit link could easily overwhelm a 10

Mb/s Ethernet link.

Each 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.

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