80-Series Qos; System Management - Avaya P580 User Manual

Chapter 1

80-Series QoS

System Management

1-20
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.
Two CoS priority queues for 50-Series modules and eight CoS
priority queues for 80-Series modules provide flexible queue
management algorithms to meet application requirements.
Configurable queue depth for each prioritized packet queues.
Configurable priority threshold.
Configurable service ratio tunes queue priority.
For more information on 50-series buffers and queues, see
"Managing Buffers and Queues on 50-Series
Quality of Service (QoS) is a set of tools that make it possible for you to
manage traffic across a switch or a network. These tools protect specific
traffic from the effects of network congestion. You can enable these
features for a module or individual ports on a module to control the flow of
traffic across your network. This control makes it possible for you to
guarantee that delay-sensitive traffic such as voice over IP (VoIP) receives
the priority it requires, while also ensuring that the switch services other
low priority data.
QoS makes it possible for you to prioritize time-sensitive traffic and assign
larger amounts of bandwidth to those applications that require it.
For more information on QoS, see
The P580 and P882 support the following system management features:
LDAP. For information on LDAP, see
Routing."
User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0
Modules."
Chapter 25, "80-Series
Chapter 12,
Chapter 24,
QoS."
"Configuring IP