Avaya BCM 4.0 Networking Guide de configuration télécharger pdf (Page 636)

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636 Chapter 67 Configuring IP Filter Rules

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DiffServ components

The DiffServ architecture is comprised of the following components:

• Traffic conditioners — These components include classifiers, DiffServ-byte markers, shapers,

policiers and profilers. Marking is performed at network boundaries, including the edges of the

network (first hop router or switch or source host) and administrative boundaries between

networks or autonomous systems. Traffic conditions should exist at DiffServ ingress and

egress nodes. BCM is an edge switch that supports packet classification based on header

information in layer 3 and layer 4 of the Open System Interconnection (OSI) layering model.

BCM can mark and re-mark IP traffic based on the rules you define.

• Packet schedulers and queue managers — PHBs are expected to be implemented by

employing a range of queue service and/or queue management disciplines on a network node

output interface queue (for example, HTB or drop preference queue management). DiffServ

does not require a particular discipline for queue management or servicing to realize a

particular service. All DiffServ nodes should support the packet scheduling and queue

management algorithms that are necessary to implement the required PHB.

BCM supports a queue service discipline that allows packets to be serviced in an absolute

priority fashion or using a weighted fair queueing scheduler. This service discipline ensures

that packets in the highest-priority queue are serviced quickly without starving lower-priority

queues.

• Bandwidth brokers (not supported in BCM) — Bandwidth brokering is responsible for

bandwidth allocation, QoS rule management, and flow admission control in a given DiffServ

domain. BCM does not support bandwidth brokering or traffic admission control.

IP service classes

BCM supports the following service classes:

• Premium class is an end-to-end service functioning similarly to a virtual leased line. Traffic in

this service class is guaranteed an agreed upon peak bandwidth. Traffic requiring this service

should be shaped at the network boundary in order to undergo a negligible delay and delay

variance. This service class is suitable for real time applications like video and voice over IP.

The recommended PHB for this service is the Expedited Forwarding (EF) PHB.

• Standard Network Control Class is used for network control traffic and has priority over user

traffic.

• Platinum, Gold, Silver, and Bronze classes use the Assured Forwarding PHB. These classes

are used for real time, delay tolerant traffic and non-real time, mission critical traffic.

• Best Effort (standard) class is the standard Internet packet service with an additional, optional

use of traffic profiling that is used at the network boundary to request a better effort treatment

for packets that are in-profile (packets that do not break the service agreements between the

user and the service provider).

Table 155 describes the service classes and the required treatment. The table shows how the

service classes are mapped to the BCM queues.

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