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Configuring WLAN Services

Configuring the QoS Policy

SCALANCE WLC711

User Guide, V8.11, 07/2012, C79000-G8976-C260-03 6-39

The SCALANCE IWLAN Controller supports the definition of 8 levels of user priority (UP). These

priority levels are mapped at the AP to the best appropriate access class. Of the 8 levels of user

priority, 6 are considered low priority levels and 2 are considered high priority levels.

WMM clients have the same 4 AC queues. WMM clients will classify the traffic and use these

queues when they are associated with a WMM-enabled AP. WMM clients will behave like

non-WMM clients—map all traffic to the Best Effort (BE) queue—when not associated with

WMM-enabled AP.

The prioritization of the traffic on the downstream (for example, from wired to wireless) and on

the upstream (for example, from wireless to wired) is dictated by the configuration of the WLAN

Service and the QoS tagging within the packets, as set by the wireless devices and the host devices

on the wired network.

Both Layer 3 tagging (DSCP) and Layer 2 (802.1d) tagging are supported, and the mapping

conforms with the WMM specification. If both L2 and L3 priority tags are available, then both are

taken into account and the chosen AC is the highest resulting from L2. If only one of the priority

tags is present, it is used to select the queue. If none is present, the default queue AC_BE is chosen.

Note:

If the wireless packets to be transmitted must include the L2 priority (send to a WMM client from a WMM-

enabled AP), the outbound L2 priority is copied from the inbound L2 priority if available, or it is inferred from

the L3 priority using the above table if the L2 inbound priority is missing.

To Configure QoS Policy:

1. From the top menu, click VNS Configuration. The Virtual Network Configuration screen is

displayed.

2. In the left pane expand the WLAN Services pane, then click the WLAN Service. The WLAN

Services configuration page is displayed.

AC_BE Best Effort

AC_TVO Turbo Voice

Table 6-13 Traffic Prioritization

VNS type Packet Source Packet type L2 L3

Tunneled Wired Untagged No Yes

Branch Wired VLAN tagged Yes Yes

Branch Wired Untagged No Yes

Branch or Tunneled Wireless WMM Yes Yes

Branch or Tunneled Wireless non-WMM No Yes

Table 6-12 Queues (continued)

Queue Name Purpose

1 2 ... 230 231 232 233 234 235 236 237 238 239 240 ... 491 492

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Siemens EF 711 Series Betriebsanweisung Seite 235