When Cisco’s IGMP Snooping stops working for a few seconds

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Spread the love         Editor’s note: this post related to when traffic is forwarded for a few seconds even if IGMP Snooping is working. Not for instances where you loose all multicast traffic when activating IGMP snooping. For those cases, please remind to activate at least one IGMP querier somewhere on the network, and the corresponding IP address (no IP address, no querier….). Introduction IGMP snooping is a feature derived from the regular IGMP standard since version 1, however it works on a mostly independent manner, as it only works at the local switch level. Multicast traffic, without IGMP snooping enabled, works as …