52, multicast multicast IGMP

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IGMPV1: Defines the basic group member query and reporting process

Last hop router periodically (60s) sends query messages to 224.0.0.1 for discovering clients

The host in the network segment sends the report message, confirms the query, and proactively informs the router to join the group

After the last hop router periodically (60s) sends a query message to 224.0.0.1来 Maintain group membership, if 180s does not receive the report message, it is considered that the member does not exist, delete the member information

Once a member of any group sends a report message, the other team members will be suppressed and no longer send the report message

In IGMPv1, when a group member leaves the group and does not know the last hop router, but silently leaves, the last hop router will also want to send data to the group if it receives the multicast message.

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IGMPv2 (more than one last hop router)

In the multicast network of multiple last hop routers, at first all last hop routers send query messages to select queries (Finder), and routers with small IP addresses become queries. Thereafter, the multicast information is sent by the query.

Its periodicity (60s) sends the query message, if the 120s does not receive the queries query message, the IP address small non-queries will become queries

Last hop router periodically (60s) sends query messages to 224.0.0.1 for discovering clients

The host in the network segment sends the report message, confirms the query, and proactively informs the router to join the group

After the last hop router periodically (60s) sends a query message to 224.0.0.1来 Maintain group membership, if 180s does not receive the report message, it is considered that the member does not exist, delete the member information

Once a member of any group sends a report message, the other team members will be suppressed and no longer send the report message

Leave messages are sent when any group member leaves the group

The last hop router then sends a GROUP-SPECIFIC query message to the reorganization immediately after it is received, and if 2s does not have any group of members responding to the report message, delete the group's information or delete the group member information

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This article is from the "Open Source Hall" blog, please be sure to keep this source http://kaiyuandiantang.blog.51cto.com/10699754/1722883

52, multicast multicast IGMP