Manual Part 2

Wireless Array
Configuring the Wireless Array 309
Note that the Array has a broadcast optimization feature that is always on
(it is not configurable). Broadcast optimization restricts all broadcast
packets (not just ARP broadcasts) to only those radios that need to
forward them. For instance, if a broadcast comes in from VLAN 10, and
there are no VLAN 10 users on a radio, then that radio will not send out
that broadcast. This increases available air time for other traffic.
28. IPv6 Filtering: this setting allows blocking of IPv6 traffic which may be a
concern for IT managers. The Xirrus Array currently bridges IPv6 traffic.
Set IPv6 filtering On if you wish to prevent the forwarding of IPv6
packets through the Array in both directions—wired network to wireless
and wireless network to wired. The default is Off.
29. Xirrus Roaming Layer: Select whether to enable roaming capabilities
between IAPs or Arrays at Layer 2 and 3, or at Layer 2 only. Depending
on your wired network, you may wish to allow fast roaming at Layer 3.
This may result in delayed traffic.
30. Xirrus Roaming Mode: This feature utilizes the Xirrus Roaming Protocol
(XRP) ensuring fast and seamless roaming capabilities between IAPs or
Arrays at Layer 2 and Layer 3 (as specified in Step 31), while maintaining
security. Fast roaming eliminates long delays for re-authentication, thus
supporting time-sensitive applications such as Voice over Wi-Fi (see
“Understanding Fast Roaming” on page 288 for a discussion of this
feature). XRP uses a discovery process to identify other Xirrus Arrays as
fast roaming targets. This process has two modes:
• Broadcast — the Array uses a broadcast technique to discover other
Arrays that may be targets for fast roaming.
• Tunneled — in this Layer 3 technique, fast roaming target Arrays
must be explicitly specified.
To enable fast roaming, choose Broadcast or Tu n n e l e d , and set additional
fast roaming attributes (Step 31). To disable fast roaming, choose Off. If
you enable Fast Roaming, the following ports cannot be blocked:
• Port 22610 — reserved for Layer 2 roaming using UDP to share PMK
information between Arrays.