VRRP heartbeat packet transmission for S series switches

For S series switches (S1700 excluded), in a VRRP + STP scenario, a VRRP group is configured on SwitchA and SwitchB. If the switch connected to a user cannot forward VRRP packets (for example, discarding unknown multicast packets is configured), or to prevent the link disconnectivity or instability for VRRP packets (heartbeat packets), a heartbeat line can be deployed between SwitchA and SwitchB to transmit VRRP packets.

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