Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 69)

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Cisco IP Telephony Network Design Guide

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Chapter 2 Campus Infrastructure Considerations

Quality of Service

QoS ACLs can also include Layer 4 information for classifying individual

applications. Cisco Catalyst 6000 family switches are also capable of policing

traffic based on Layer 3 addresses and Layer 4 port numbers. For example, you

can police individual HTTP flows to 1 Mbps and aggregate all HTTP flows to

25 Mbps.

The following are important points in regard to QoS functionality on the

Cisco Catalyst 6000 family switches:

• By default, QoS is not enabled. Use set qos enable to enable QoS on the

switch.

• By default, ports are not trusted. Use the following command to enable trust

on a port:

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

trust-dscp}

• QoS configurations can be applied on a per-port basis or on a per-VLAN

basis. This works very well for IP telephony implementations where phones

are on a separate VLAN, as described in the “IP Addressing and

Management” section on page 2-21.

• By default, Cisco Catalyst 6000 family switches map CoS to ToS when the

port is trusted or by using QoS ACLs.

Tips If the trust boundary happens to be on a wiring closet switch that is

not capable of reclassifying at Layer 3, you can shrink the trust

boundary to the distribution layer where a Layer 3 capable device is

more likely to be present.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 69