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660 CHAPTER 46: CONFIGURING VRRP
The console frequently displays messages about configuration mistakes.
This shows that a mistaken VRRP packet has been received. One reason may be
inconsistent configuration of another router within the standby group. Another
reason may be the attempt of some devices to send out illegal VRRP packets.
The first possibility can be solved through modifying the configuration. The second
possibility is caused by the malicious attempt of some devices so non-technical
measures should be attempted.
Many master routers exist within the same standby group.
There are also 2 reasons. One is short coexistence of many master routers, which is
normal and needs no manual intervention
. Another is the long coexistence of
many master routers, which may be caused by failure to receive VRRP packets
between master routers, or the reception of illegal
packets.
To solve these problems, try to ping the many master routers. If that fails, it
indicates faults in the links between routers and it is necessary to check the links. If
they can be pinged through, it indicates that the problems may be caused by an
inconsistent configuration. For the configuration of the same VRRP standby group,
complete consistence for the number of virtual IP addresses, each virtual IP
address, timer interval and authentication method must be guaranteed.
There is requent switchover of the VRRP state.
Such problems are generally caused by standby group timer intervals that are too
short. To solve this problem, extend this interval or configure the preemption
delay.