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Configuring the Wireless AP

Configuring Co-located APs in Load Balance Groups

SCALANCE WLC711

3-70 C79000-G8976-C260-03, 07/2012, User Guide, V8.11

You must assign an AP’s radio to the load balance group for the client distribution to occur. Load

balancing occurs only among the assigned AP radios of the load balance group. Each radio can be

assigned only to one load balance group. Multiple radios on the same AP do not have to be in the

same load balance group. The radios that you assign to the load balance group must be on APs

that are controlled by the same SCALANCE IWLAN Controller.

The load balance group uses one or more WLAN services for all APs assigned to the load balance

group. You can configure two types of load balance groups:

You can configure two types of load groups:

• Client Balancing load group – preforms load balancing based on the number of clients across

all APs in the group and only for the WLANs assigned to the load group. This is different

from load control in the Radio Preference group— load control APs make decisions in

isolation from each other.

• Radio Preference load group – performs band preference steering and load control. Band

preference steering is a mechanism to move 11a-capable clients to the 11a radio on the AP,

relieving congestion on the 11g radio. No balancing is done between the 11a and 11g radios.

Load control is disabled by default. A radio load group executes band preference steering

and/or load control across the radios on each AP in the group. Each AP balances in isolation

from the other APs, but all APs in the load group have the same configuration related to the

band preference and load control.

Client balancing on the SCALANCE IWLAN Controller is AP-centric and requires no input from

the client. The AP radios in the client balance group share information with secure (AES) SIAPP

(Siemens Inter-AP Protocol) messaging using multicast on the wired network. All APs in a client

balance group must be in the same SIAPP cluster to ensure that each AP can reach all other APs in

the client balance group over the wired subnet. If the APs in a client balance group are not in same

SIAPP cluster, client balancing will happen independently within the su/jointfilesconvert/358746/bgroups defined by

SIAPP clusters.

The benefits of configuring your co-located APs that are controlled by the same SCALANCE

IWLAN Controller as a client balance group are the following:

• Resource sharing of the balanced AP

• Efficient use of the deployed 2.4 and 5 GHz channels

• Reduce client interference by distributing clients on different channels

• Scalable 802.11 deployment: if more clients need to be served in the area, additional APs can

be deployed on a new channel

You can assign a maximum of 32 APs to a client balance group. Table 3-13 lists the maximum

number of load balance groups for each SCALANCE IWLAN Controller.

Currently, the following Wireless AP models support load balance groups:

• SCALANCE W786C-2 RJ45

• SCALANCE W786C-2IA RJ45

• SCALANCE W788C-2 RJ45

• SCALANCE W788C-2 M12

Table 3-13 Maximum Number of Load Balance Groups

SCALANCE IWLAN Controller Number of load balance groups

WLC711 8

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 ... 491 492

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