Cisco Cisco 2504 Wireless Controller 문제 해결 가이드

Each query or advertisement is sent to the Bonjour multicast address for delivery to all clients on
the subnet. Apple’s Bonjour protocol relies on Multicast DNS (mDNS) operating at UDP port 5353
and sends to these reserved group addresses:

IPv4 Group Address - 224.0.0.251

●

IPv6 Group Address - FF02::FB

●

The addresses used by the Bonjour protocol are link-local multicast addresses and thus are only
forwarded on the local L2 domain. Routers cannot use multicast routing to redirect the traffic
because the time to live (TTL) is set to one, and link-local multicast is meant to stay local by
design.

When deploying Bonjour over network, it is important that both the client and device offering the
service are on the same VLAN. For the wireless network, this means ensuring each client is on the
same backend interface in the controller.

Note: Apple TV (release v5.0) does not support WPA2-Enterprise authentication. For 802.1x
networks, a workaround is to create a WPA2-PSK WLAN using the same wired interface.

For a large scale deployment, using a single VLAN may be impossible. The 

 section of this document details how it is possible to have clients on one VLAN

while the Apple TV devices are on another.

Go to the Controller tab and then the Multicast link on the left-hand menu. Enable Global
Multicast Mode and IGMP Snooping. In the v7.2 release, you should also enable MLD
Snooping in order to deal with Bonjour over IPv6.