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Working with VSCs
Quality of service (QoS)
The QoS feature defines four traffic queues based on the Wi-Fi Multimedia (WMM) access
categories. In order of priority, these queues are:
Queue
WMM
access category Typically used for
1
2
3
4
AC_VO
AC_VI
AC_BE
AC_BK
Voice traffic
Video traffic
Best effort data traffic
Background data traffic
Outgoing wireless traffic on the VSC is assigned to a queue based on the selected priority
mechanism. Traffic delivery is based on strict priority (per the WMM standard). Therefore, if
excessive traffic is present on queues 1 or 2, it will reduce the flow of traffic on queue 3 and
queue 4.
Regardless of the priority mechanism that is selected:
Traffic that cannot be classified by a priority mechanism is assigned to queue 3.
SVP (SpectraLink Voice Protocol) traffic is always assigned to queue 1, except if you
select the VSC-based priority mechanism, in which case SVP traffic is assigned to the
configured queue.
Priority mechanisms
Priority mechanisms are used to classify traffic on the VSC and assign it to the appropriate
queue. The following mechanisms are available:
802.1p
This mechanism classifies traffic based on the value of the VLAN priority field present within
the VLAN header.
Queue 802.1p (VLAN priority field value)
1 6,7
2 4,5
3 0,2
4 1,3
2-26