Avaya BCM 4.0 Networking Przewodnik Konfiguracji Pobierz pdf (Strona 637)

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Chapter 67 Configuring IP Filter Rules 637

BCM 4.0 Networking Configuration Guide

These Required treatments (or service class behaviors) for these Service classes are implemented

using seven queues and a scheduler for these queues. Queue 1 has the highest priority, referred to

as Strict Priority. Queues 2 to 7 are scheduled according to a HTB (Hierarchical Token Buckets)

scheme. This scheduler allows each service class to use a minimum traffic rate, and allows unused

bandwidth of other classes in the HTB scheduler to be redistributed to other classes. With this

scheduler, you can arrange for the premium service class to behave as a strict priority scheduler

and provide shaping capabilities to prevent starving the other six queue

s. Table 156 summarizes

the mappings between service classes, queues and DSCP codes.

Table 155 Service classes

Traffic category Service class Application type Required treatment

Real time, delay

intolerant, fixed

bandwidth

Premium Person to person communications

requiring interaction (such as

VoIP).

Absolute bounded priority over user

traffic. No packet loss for in-profile

traffic. Virtual leased line with lowest

amount of latency. Provisioned for

peak rate.

Standard Network

Control

Network Standard network control traffic Priority over user traffic. Guaranteed

minimum bandwidth

Real time, delay tolerant,

low variable bandwidth

Platinum Person to person communications

requiring interaction with

additional minimal delay (such as

low cost VoIP).

Higher-priority scheduling providing

guaranteed minimum provisioned

bandwidth. Competes for additional

bandwidth.

Real time, delay tolerant,

high variable bandwidth

Gold Single human communication

with no interaction (such as Web

site streaming video).

High-priority scheduling providing

guaranteed minimum provisioned

bandwidth. Competes for additional

bandwidth.

Non-real time, mission

critical, interactive

Silver Transaction processing (such as

Telnet, Web browsing).

Medium priority scheduling providing

guaranteed minimum provisioned

bandwidth. Competes for additional

bandwidth.

Non-real time, mission

critical, non-interactive

Bronze For example, E-mail, FTP, SNMP. Lower-priority scheduling providing

guaranteed minimum provisioned

bandwidth. Competes for additional

bandwidth.

Non-real time,

non-mission critical

Standard Bulk transfer (such as large FTP

transfers, after-hours tape

backup).

Best effort delivery. Uses remaining

available bandwidth.

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