Avaya EE Networking User's Guide download pdf (Page 30)

30 Using Enterprise Edge Services

Enterprise Edge Networking Operations Guide P0910464 Issue 01

Quality of Service

This section includes information on:

• QoS overview

• DiffServ networks

• Legacy networks

• Admission control

• Packet marking for DiffServ networks

• Port range setting for legacy networks

• Relationship between the QoS Module and the VoIP QoS monitor

• Enterprise Edge QoS restrictions and defaults

QoS overview

On the Internet, Quality of Service (QoS) is the methodology that transmission

rates, error rates, and other characteristics can be measured, improved, and, to some

extent, guaranteed in advance. QoS is of concern for the continuous transmission of

high-bandwidth voice and video multimedia information. Transmitting this content

dependably is difficult in public networks using ordinary “best effort” protocols.

Real-time applications that include voice and video are time-sensitive. Delivering

voice and video over the Internet requires bounded packet delay and jitter.

Differentiated Services (DiffServ) is a QoS framework standardized by IETF that

focuses on DiffServ standards for real-time and mission critical applications. The

DiffServ standards are evolving and vendors are starting to develop network

devices that support DiffServ.

The purpose of the Enterprise Edge QoS module is to prioritize IP traffic and to

provide an acceptable quality of service to delay and jitter sensitive applications

such as audio and video as well as mission critical applications.

The Enterprise Edge QoS module primarily serves two purposes:

• In a DiffServ network, it acts as an edge device and performs the packet

classification, marking, and prioritization.

• In a non-DiffServ or legacy network, it manages the WAN link to make sure

premium voice (and optional video) packets get high priority when crossing the

slow WAN link in both directions.

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Avaya EE Networking User's Guide Page 30