Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 177

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8-3
Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 8 Quality of Service
Campus QoS Model
in small, finite intervals as a result of the bursty nature of network traffic. When
this occurs, any packets destined for that transmit interface are dropped. The only
way to prevent dropped voice traffic is to configure multiple queues on campus
switches. Table 8-2 lists the Cisco Ethernet switches that support enhanced
queuing services.
Table 8-2 Queuing Services Supported by Cisco Switches
Campus Switching
Element Queuing Scheme Queue Scheduler Queue Admission
Catalyst 6000 2Q2T and 1P2Q2T WRR and PQ/WRR Configurable
Catalyst 8500 4Q1T WRR Configurable in CoS
pairs
Catalyst 4000 2Q1T RR Configurable in CoS
pairs
Catalyst 3500 2Q1T PQ Not configurable.
CoS 0-3 = Queue1
CoS 0-3 = Queue2
Catalyst 2900 XL
(8 MB DRAM)
2Q1T PQ Not configurable.
CoS 0-3 = Queue1
CoS 0-3 = Queue2
IP Phone 1P3Q1T RR with a PQ timer Not configurable.
CoS 5 = Queue0 (PQ).
All other CoS values =
Queues 1-3.
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