Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 70)

Chapter 2 Campus Infrastructure Considerations

Quality of Service

2-36

Cisco IP Telephony Network Design Guide

78-11103-03

Summary of Capabilities and Recommendations

Table 2-2 briefly summarizes the capabilities within the Cisco Catalyst switch

families.

Note Currently the only Cisco LAN switches that support a minimum of

two queues and that can guarantee voice quality are the

Cisco Catalyst 8500, Catalyst 6XXX family, Catalyst 4XXX

family, Catalyst 3500XL, and Catalyst 2900XL.

Here are some summary recommendations for QoS implementation:

• Create a trust boundary at the network edge in the wiring closet. Make ports

trusted on the wiring closet switch where IP phones are attached.

• Reclassify ToS at the edge if devices cannot be trusted.

• Shrink the trust boundary to the distribution layer and reclassify ToS there if

reclassification is not possible at the edge.

• Use a priority queue if possible for delay-sensitive traffic.

Table 2-2 Summary of QoS Capabilities on the Cisco Catalyst Switch Family

Platform

Ability

to Trust

Reclassify

CoS

Reclassify

ToS

Congestion

Avoidance

(WRED)

Priority

Queue

Multiple

Queues

Congestion

Management

(WRR) Policing

Catalyst

6000

Yes Yes Yes Yes No Yes Yes Yes

Catalyst

5000

No Yes Yes

1. With additional configuration

Yes No No No No

Catalyst

4000

No Yes No No No Yes No No

Catalyst

3500

Yes Yes No No Yes Yes No

2. Round robin only

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 261 262

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