AI, ML, Development + Cisco Learning Blog Learning about Machine Learning, Artificial Intelligence, related devlopment topics and formerly Routing and Switching, Datacenter, Security and other topics, CCIE #23664, Frank Wagner

I have read about this subnet range, it`s not possible to disable the snooping feature on a switch. So routing protocols (like OSPF or EIGRP) are always forwarded to other ports regardless the snooping feature. Is that true? Someone with more informations on that.

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In general, addresses from 224.0.0.1 to 224.0.0.255 are reserved and used by various protocols (standard or proprietary, such as Hot Standby Router Protocol (HSRP)). Cisco recommends that you not use these for GDA in a multicast network. CGMP and IGMP snooping do not work with this reserved address range.
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Source:

http://www.cisco.com/warp/public/473/22.html