The VRRP master/backup switchover is abnormal

Hi @listena,

I think it's a problem caused by STP. STP is enabled on the switch by default. After the interface is restarted, it starts to forward packets after waiting for 30 seconds. During this period, the two routers cannot receive VRRP Advertisement packets from each other. As a result, two master routers exist.

It is recommended to disable STP globally on the switch. On an actual network, if STP is enabled only on one device, it does not take effect.

Any further questions, let us know!

Dear listena,

Looking at your configurations we can see that you are passing VRRP heart beat form the swith, and your switch is a Layer two switch,
it must have had STP enable causing your Ports to go into Listening Learning state on flap and blocking hello messages (what we call heartbeat) and hence both routes think of themselves as master, and as soon as your ports go into active state they take their actual roles,

It is a good design practice on a switch to make all the ports which are not connected with other layer two devices as STP edge ports, and then enable BPDU gaurd so that those ports cannot intrupt STP process.
so in your case, make Gi0/0/1,2 and 3 an stp Edge port and your issue will be resolved.