3Com 8807 Configuration Manual page 665

Troubleshooting VRRP 665
Fault 2: More than one Masters existing within the same virtual router
There are also 2 reasons. One is short time coexistence of many Master switches,
which is normal and needs no manual intervention. Another is the long time
coexistence of many Master switches, which may be because switches in the
virtual router cannot receive VRRP packets from each other, or receive some illegal
packets.
To solve such problems, an attempt should be made to ping among the many
Master switches, and if such an attempt fails, check the device connectivity. If they
can be pinged, check the VRRP configuration. For the configuration of the same
VRRP virtual router, complete consistence for the number of virtual IP addresses,
each virtual IP address, timer duration and authentication type must be
guaranteed.
Fault 3: Frequent switchover of VRRP state
Such problem occurs when the virtual router timer duration is set too short. So the
problem can be solved through prolonging this duration or configuring the
preemption delay.