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Enabling or Disabling Multicast

Last updated: 2022-01-26 10:37:37

    This document describes how to enable or disable multicast for VPCs.


    Broadcast and multicast are modes of one-to-many communication, which can save businesses on the network bandwidth and reduce network load through point-to-multipoint efficient data transmission.
    In the unicast mode, the initiating server sends data to N servers separately. If the multicast mode, the server sends the same data to N servers in once, which reduces the server resource consumption and also the bandwidth resource of the backbone network.


    • The broadcast and multicast features are currently in beta test. If you do need to use them, please submit an application.
    • At present, the regions supporting multicast and broadcast are: Beijing, Shanghai, Guangzhou, Chengdu, Chongqing, Nanjing, Hong Kong of China, Singapore, Seoul, Tokyo, Bangkok, Toronto, Silicon Valley, Virginia, Frankfurt and Moscow.
    • Multicast: Tencent Cloud supports multicast on the VPC dimension.
    • Broadcast: Tencent Cloud supports broadcast on the subnet dimension.


    Multicast and broadcast are mostly used in the financial and game industries:

    • Broadcast services or market data of the financial industry. For example, after obtaining stock prices and other real-time data, brokers can broadcast stock data to multiple clients in real time, effectively reducing network load.
    • For the game industry, broadcast and multicast are mainly used for heartbeat holding between multiple servers.


    Enabling multicast

    1. Log in to the VPC console.
    2. In the VPC list, locate the desired VPC, and toggle on Multicast.

    Disabling multicast

    1. Log in to the VPC console.
    2. In the VPC list, locate the desired VPC, and toggle off Multicast.


    For more information about the subnet-level broadcasting, see Enabling or Disabling Broadcast.

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