Device model: USG2130 V100R005 Switch: S2300
Description: If the USG interface which is connected to switch is down, the USG VRRP can switch normally. If the lines between switches are full broken, USG will not standby switch, there will be no relevant debug VRRP information.
1 Check VRRP configuration, they are correct;
2 Suspect that USG middle line passes the VRRP message, but it can’t be switched when the USG middle line is broken;
3 It can be switch normally when directly cut off the main USG line connected with switch. This is determined by VRRP working principle. VRRP will cause the standby switch if only the interface is DOWN, so it can’t be switch only though cutting the link line between two switches. We can solve the problem by changing two USGs link to the same switch.
1 Suspect VRRP configuration;
2 Suspect connected line passes VRRP news;
It is recommended that two USG VRRP pick a switch when networking.