Brocade Mobility 7131N-FGR Access Point Product Reference Guide (Supporting software release 4.0.0.0-35GRN and later) - Manual (Page 145)

Brocade Mobility 7131N-FGR Product Reference Guide 133
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Enabling Wireless LANs (WLANs)
5
U-APSD (WMM Power Save) support
The access point now supports Unscheduled Automatic Power Save Delivery (U-APSD), often
referred to as WMM Power Save. U-APSD provides a periodic frame exchange between a voice
capable MU and the access point during a VoIP call, while legacy power management is still utilized
for typical data frame exchanges. The access point and its associated MU activate the new U-APSD
power save approach when a VoIP traffic stream is detected. The MU then buffers frames from the
voice traffic stream and sends a VoIP frame with an implicit "poll" request to its associated access
point. The access point responds to the poll request with buffered VoIP stream frame(s). When a
voice-enabled MU wakes up at a designated VoIP frame interval, it sends a VoIP frame with an
implicit "poll" request to its associated access point. The access point responds to the poll request
with buffered VoIP stream frame(s).
NOTE
The access point ships with the U-APSD feature disabled by default. It is automatically enabled when
WMM is enabled for a WLAN. Thus, U-APSD is only functional when WMM is enabled. If WMM is
disabled, then U-APSD is disabled as well.
Configuring WLAN hotspot support
The access point enables hotspot operators to provide user authentication and accounting without
a special client application. The access point uses a traditional Internet browser as a secure
authentication device. The access point issues an IP address to the user using a DHCP server,
authenticates the user and grants the user to access the Internet.
When a user visits a public hotspot and wants to browse to a Web page, they boot up their laptop
and associate with the local Wi-Fi network by entering the correct SSID. They then start a browser.
The hotspot access controller forces this un-authenticated user to a Welcome page from the
hotspot Operator that allows the user to login with a username and password.
The access point hotspot functionality requires the following:
• HTTP Redirection - Redirects unauthenticated users to a specific page specified by the Hotspot
provider.
• User authentication - Authenticates users using a Radius server.
• Walled garden support - Enables a list of IP address (not domain names) accessed without
authentication.
• Billing system integration - Sends accounting records to a Radius accounting server.
CAUTION
When using the access point’s hotspot functionality, ensure MUs are re-authenticated when
changes are made to the characteristics of a hotspot enabled WLAN, as MUs within the WLAN will
be dropped from access point device association.
To configure hotspot functionality for an access point WLAN:
1. Ensure the Enable Hotspot checkbox is selected from within the target WLAN screen, and
ensure the WLAN is properly configured.
Any of the sixteen WLANs on the access point can be configured as a hotspot. For hotspot
enabled WLANs, DHCP, DNS, HTTP and HTTPS traffic is allowed (before you login to the
hotspot), while TCP/IP packets are redirected to the port on the subnet to which the WLAN is
mapped. For WLANs not hotspot-enabled, all packets are allowed.