Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 178)

Chapter 8 Quality of Service

WAN QoS Model

8-4

Cisco IP Telephony Network Design Guide

78-11103-03

WAN QoS Model

The enterprise WAN model is shown in Figure 8-1.

Figure 8-1 Typical Enterprise WAN

WAN Provisioning

Before voice and video can be placed on a network, it is necessary to ensure that

adequate bandwidth exists for all required applications. To begin, the minimum

bandwidth requirements for each major application (for example, the voice media

streams, video streams, voice control protocols, and all data traffic) should be

summed. This sum represents the minimum bandwidth requirement for any given

link, and it should consume no more than 75% of the total bandwidth available on

that link. This 75% rule assumes that some bandwidth is required for overhead

traffic such as routing and Layer 2 keepalives, as well as for additional

applications such as e-mail, HTTP traffic, and other data traffic that is not so

easily measured. See Figure 8-2.

Cisco 7200

Cisco 2600

Cisco 3600

Point to point

ATM/Frame

Relay

Regional/HQ

office

Branch

offices

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 178