Enabling or Disabling Multicast

Last updated: 2021-10-18 11:13:04

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


    Multicast and broadcast are modes of one-to-many communication, which can help enterprises reduce network bandwidth consumption and network load through point-to-multipoint efficient data transmission.
    If unicast is used, the sending server needs to separately send to N servers for total N times. If multicast is used, the server sends the same data to N servers only once, which reduces server resource consumption and also bandwidth resources of the backbone network.


    • The broadcast and multicast features are currently in beta phase. To become a beta user, please submit an application for broadcast or multicast.
    • Currently, the broadcast and multicast features are available in Beijing, Shanghai, Guangzhou, Nanjing, Chengdu, Chongqing, and Hong Kong, China.
    • 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.

    Relevant Operations

    For detailed directions regarding the subnet broadcast, see Enabling or Disabling Broadcast.