We have several remote sites connecting back to a central site for Internet access (connected via AT&T's ASE). Recently, we enabled multicast routing everywhere to support a particular application on our newly installed Cisco phones. The application is working fine, but recently we've begun to notice an increase in multicast traffic to all remote locations. A packet capture at one of the sites shows that it is mostly mDNS with some LLMNR, and mostly all coming from wireless users at other sites. I think a fair bit of them may be Apple products (iPads, iMacs, Apple TV).
Our wireless is a pair of 5520 WLCs at the central site and many 2802i's at the remote site in local mode.
I thought 224.0.0.x addresses were supposed to be link-local. The packet capture showed the mDNS packets with a TTL of 254. What is the best way to keep this traffic from getting routed out from one location to another?
