Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 67)

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Cisco IP Telephony Network Design Guide

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Chapter 2 Campus Infrastructure Considerations

Quality of Service

Figure 2-16 shows a different case in which the PC is not trusted completely, yet

it gets a level of service higher than it would with CoS=0. This is achieved by

extending a specific CoS value to the PC traffic.

Figure 2-16 PC Is Not Trusted but Gets a Non-Zero CoS

Note All of the previously discussed configurations can be used on any

Catalyst switch that runs Cisco CatOS or native Cisco IOS software

(for example, Catalyst 3524XL).

QoS Commands

Three commands are available for specifying classification and trust boundary:

• set port qos mod/ports trust {untrusted | trust-cos | trust-ipprec |

trust-dscp}

Defines the trust boundary.

• set port qos mod/ports {trust-ext | trust-cos}

Extends the trust boundary to the PC.

• set port qos mod/ports cos-ext value

Sets a defined CoS to the traffic from the PC.

Example: set port qos 2/1 cos-ext 2

PC is untrusted.

Phone ASIC

rewrites CoS based

on switch

configuration

(for Example

Extended CoS = 2)

CoS = 5

CoS = 2 CoS = 7

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 67