Why disable igmp snooping

N Routers. Nighthawk Routers. Powerline and Wall Plug Extenders. Wireless Access Points. Other Business Products. Mobile Broadband. Part of this answer would be dependent on the specific hardware in question. Could you provide this information? For example, if the platform supports IGMP snooping in software rather than hardware, there would be a certain performance cost to running it.

The router in question would be using software - but if I could get a more general answer, that would be more likely to get my vote — HorusKol. Additional system resources is a downside. Not a big one though. Add a comment. Active Oldest Votes. Thus, it's rarely enabled by default.

Improve this answer. Ricky Ricky Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Its important values become more clear when a filtering method of multipoint transmission is missing: the incoming multicast packets are broadcast to all hosts in the broadcast domain. Especially in larger networks, IGMP Snooping switch reduces unnecessarily high traffic which can even lead to network congestion.

If IGMP snooping command is enabled, bandwidth wastes and hostile attacks like these will be optimized greatly. All downstream hosts only receive multicast packets for which they have previously registered via group requests. Using network switch supporting IGMP Snooping is therefore worthwhile wherever a great deal of bandwidth is required. Examples include IPTV and other streaming services as well as web conference solutions.

You can leave snooping on, and make a static mac-address-table entry for a particular multicast MAC in order to have it statically configured. The mac-address-table static mac-address vlan-id interface-type disable-snooping command sends any traffic destined for this MAC address in specified VLAN to mentioned interfaces, and it sends an IGMP in order to disable the ability for other hosts connected to the switch to receive the stream.

The mac-address-table static command is used in this scenario to take igmp snooping out of the equation, as igmp snooping is a dynamic method to map multicast MAC addresses to multiple ports, by the static configuration of which ports get a multicast stream. Buy or Renew. Find A Community. Cisco Community. Join us in congratulating October's Spotlight Award Winners!

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