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H3C Technologies H3C WX3000E Series Wireless Switches User Manual

Page 167

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155

Step Command

Remarks

3.

Enable WMM.

wmm enable

By default, WMM is enabled.
The 802.11n protocol stipulates

that all 802.11n clients support
WLAN QoS. Therefore, when the

radio operates in 802.11an or

802.11gn mode, you should
enable WMM. Otherwise, the

associated 802.11n clients may

fail to communicate.

4.

Set the EDCA parameters of
AC-VO or AC-VI queues for

clients.

wmm edca client { ac-vo | ac-vi }
{ aifsn aifsn-value | ecw ecwmin

ecwmin-value ecwmax ecwmax
-value
| txoplimit txoplimit-value |

cac } *

Optional.
By default, a client uses the default

EDCA parameters shown in

Table

3

.

5.

Set the EDCA parameters of

AC-BE or AC-BK queues for
clients.

wmm edca client { ac-be | ac-bk }
{ aifsn aifsn-value | ecw ecwmin
ecwmin-value ecwmax ecwmax

-value | txoplimit txoplimit -value } *

Optional.
By default, a client uses the default
EDCA parameters shown in

Table

3

.

6.

Set the EDCA parameters and

specify the ACK policy for the
AP radio.

wmm edca radio { ac-vo | ac-vi |
ac-be | ac-bk } { aifsn aifsn-value |

ecw ecwmin ecwmin-value ecwmax

ecwmax -value | txoplimit txoplimit
-value
| noack } *

Optional.
By default, an AP radio uses the

default EDCA parameters shown
in

Table 4

and uses the Normal

ACK policy.

7.

Set the CAC policy.

wmm cac policy { channelutilization
[ channelutilization-value ] | users

[ users-number ] }

Optional.
By default, the users-based
admission policy applies, with the

maximum number of users being

20.

8.

Map SVP packets to a
specified AC queue.

wmm svp map-ac { ac-vi | ac-vo |
ac-be | ac-bk }

Optional.
By default, the SVP packet

mapping function is disabled.
Note that SVP packet mapping
applies to non WMM clients, and

does not take effect on WMM

clients.

NOTE:

If CAC is enabled for an AC queue, CAC is also enabled for the AC queues with higher priority. For
example, if you use the wmm edca client command to enable CAC for the AC-VI queue, CAC is also

enabled for the AC-VO queue. However, enabling CAC for the AC-VO queue does not enable CAC for

the AC-VI queue.

H3C recommends that you use the default EDCA parameter settings for APs and clients (except the
TXOPLimit parameter for devices using 802.11b radio cards) unless it is necessary to modify the default

settings.

When the radio card of a device is 802.11b, H3C recommends that you set the TXOPLimit values of the
AC-BK, AC-BE, AC-VI, and AC-VO queues to 0, 0, 188, and 102 respectively.

The SVP packet mapping function takes effect only after you enable WMM.