Справочник Пользователя для 3com WX2200 3CRWX220095A
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C
HAPTER
16: C
ONFIGURING
Q
UALITY
OF
S
ERVICE
(To display a MAP’s CoS mappings and queue usage statistics, see
“Displaying MAP Forwarding Queue Statistics” on page 349.)
“Displaying MAP Forwarding Queue Statistics” on page 349.)
Figure 28 shows an example of end-to-end QoS in a 3Com network. In
this example, voice traffic is prioritized based on WMM. This example
assumes that the QoS mappings are set to their default values.
this example, voice traffic is prioritized based on WMM. This example
assumes that the QoS mappings are set to their default values.
Figure 28 WMM QoS in a 3Com Network
Figure 28 shows the following process:
1 A user sends voice traffic from a WMM VoIP phone. The phone marks the
CoS field of the packet with service type 7, indicating that the packet is
for high priority (voice) traffic.
for high priority (voice) traffic.
2 MAP A receives the voice packet and classifies the packet by mapping the
service type in the 802.11 header to an internal CoS value. In this
example, the service type is 7 and maps to internal CoS 7.
example, the service type is 7 and maps to internal CoS 7.
Layer 3
WX Switch B
Srvc Type = 7 Voice Data . . .
IP ToS = 0xe0
Voice Data. . .
802.1p = 7
IP ToS = 0xe0
Voice Data. . .
802.1p = 7
Voice
Video
Best Effort
Bgrnd
WX Switch A
4
1
2
3
5
6
Voice Data. . .
Tnl Hdr IP ToS = 0xe0
Voice Data. . .
Tnl Hdr IP ToS = 0xe0
Layer 3
MAP A
MAP B