Chapter 12 Policy and Static Routes
NXC5200 User’s Guide
209
WMM
Wi-Fi Multimedia (WMM) provides basic Quality of Service (QoS) features to
wireless networks. The four categories of QoS described by WMM are: voice (VO),
video (VI), best effort (BE), and background (BK). These categories, known as a
“access categories” (AC), are mapped to 802.1D priority values which can then be
mapped to their corresponding DSCP hex values.
The WMM ACs as implemented on the NXC have the following functions:
VOICE: All wireless traffic to the SSID is tagged as voice data. This is
recommended if an SSID is used for activities like placing and receiving VoIP
phone calls.
VIDEO: All wireless traffic to the SSID is tagged as video data. This is
recommended for activities like video conferencing.
BEST EFFORT: All wireless traffic to the SSID is tagged as “best effort,” meaning
the data travels the best route it can without displacing higher priority traffic. This
is good for activities that do not require the best bandwidth throughput, such as
surfing the Internet.
BACKGROUND: All wireless traffic to the SSID is tagged as low priority or
“background traffic”, meaning all other access categories take precedence over
this one. If traffic from an SSID does not have strict throughput requirements,
then this access category is recommended. For example, an SSID that only has
network printers connected to it.
Port Triggering
Some services use a dedicated range of ports on the client side and a dedicated
range of ports on the server side. With regular port forwarding, you set the port(s)
and IP address to forward a service (coming in from the remote server) to a client
Table 74
WMM to DiffServ Conversion on the NXC
Priority
WMM AC
802.1D Priority
DSCP Hex Value
Lowest
Highest
BK
1
0x08
BK
2
0x10
BE
0
0x00
BE
3
0x18
VI
4
0x20
VI
5
0x28
VO
6
0x30
VO
7
0x38