VRRP Heartbeat Line
As shown in Figure 1, a VRRP group is configured between SwitchA and SwitchB, and STP is configured. If the switch connected to users cannot forward VRRP Advertisement packets (for example, the switch is configured to discard unknown multicast packets) or the reachability or stability of the link that VRRP Advertisement packets traverse needs to be ensured, deploy a heartbeat line between SwitchA and SwitchB. This allows VRRP Advertisement packets to be transmitted.
After the heartbeat line is configured, Interface1 and Interface2 need to be added to the VLAN corresponding to the VRRP group. For example, when the VRRP group is configured on VLANIF 100, Interface1 and Interface2 need to be added to VLAN 100. In this situation, a loop occurs between SwitchA, SwitchB, and Switch1. A loop prevention protocol such as STP needs to be used to eliminate loops.
