QTECH QSW-8300 Инструкция по настройке - Manual (Page 307)

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And then, make sure that IPv6 forwarding function is enabled (use ipv6 enable command);
Besides, make sure that VRRPv3 protocol is enable on the interface;
Check whether the time of timer in different routers (or layer-three Ethernet switch) within the
same backup group is the same;
Check whether the virtual IPv6 addresses in the same backup group is the same.