What protocols are used to implement group management and multicast applications in the network

The IGMP protocol is used to implement group management and multicast applications in the network. The working process of IGMP is: 1. When a host joins a new work group, it sends an igmp host membership report message to All host groups; 2. The local multicast router periodically polls hosts on the local network.

IGMP protocol is used to implement group management and multicast applications in the network

IGMP protocol

The working process of IGMP is as follows:

1. When a host joins a new work group, it sends an igmp host membership report message to all host groups to announce this membership. Local multicast After receiving this message, the router spreads the relationship information to other multicast routers on the Internet and establishes the necessary routes. At the same time, it maps the IP host group address to the mac address on the host's network interface and resets it. Address filter.

2. In order to handle dynamic membership relationships, the local multicast router periodically polls the hosts on the local network to determine which hosts are in each host group. This polling process is This is achieved by sending an igmp host membership query message. This message is sent to all host groups, and the ttl field of the message is set to 1 to ensure that the message will not be transmitted outside the lan. The host group members who receive the message will Send a response message. If all host group members respond at the same time, it may cause network congestion. The IGMP protocol uses a random delay method to avoid this situation. This ensures that there is only one member of each host group at the same time. Sending response message.

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