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Cisco LAN Switching Fundamentals by Basir Sakandar - CCIE No. 6040, David Barnes - CCIE No. 6563

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Understanding IGMPv1 and IGMPv2

Communication between the router and the host is done via the IGMP, which has two versions. In IGMPv1, two IGMP packets are defined. The first packet is a membership query sent by the query router every 1 minute on the segment to find out what multicast groups are still in use. The second packet is a membership report. The hosts use a membership report to inform the query router of their interest for a specific multicast traffic. No leave process exists in IGMPv1. If the query router does not receive a membership report within 3 minutes, the router will prune the interface. A pruned interface stops receiving the multicast feed for that group. The show mroute command displays which interface has been pruned for ...

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