User's Manual

Wireless Array
286 Configuring the Wireless Array
To add a new IP address to the list, type it in the top field and click the
Add button to its right. You may only enter IP addresses—host names are
not allowed. This is because mDNS is a link local multicast address, and
does not require IGMP to the gateway.
To remove an entry, select it in the list and click Delete. To remove all
entries from the list, click Reset.
21. Multicast Forwarding
Multicast Forwarding is a Xirrus feature that forwards selected multicast
traffic between wired VLANs and wireless SSIDs. For example, Apple
devices use mDNS to advertise and find services, using local network
multicasts that are not routed. This creates an issue when you are using
Apple devices on the Wireless LAN, and have other devices that provide
services connected on the wired infrastructure in a different VLAN, for
example, printers and AppleTV devices. One way to address this issue is
to set up multicast forwarding between the wireless SSID and the wired
VLAN. This requires the wired VLAN to be trunked to the Array. Once
configured correctly, mDNS traffic will be forwarded from the specified
wireless network(s) to the specified wired VLANs and vice-versa, subject
to any mDNS service filtering defined (Step 23).
Use multicast forwarding together with multicast VLAN forwarding
(Step 22) and mDNS filtering (Step 23) to make services available across
VLANs as follows:
• In Multicast Forwarding Addresses, enter a list of multicast
addresses that you want forwarded, for example, 224.0.0.251 (the
multicast address for Bonjour).
• In Multicast VLAN Forwarding, enter a list of VLANs that
participate in the multicast forwarding.
• In MDNS Filter, specify the mDNS service types that are allowed to
be forwarded.
• If you leave this field blank, then there is no filter, and mDNS
packets for all service types are passed.