3com DUA1750-2BAA01 Manual De Usuario

3Com Switch 8800 Configuration Guide 

Chapter 41  VRRP Configuration

 

41-14 

As the configuration of VRRP is not very complicated, almost all the malfunctions can 

be found through viewing the configuration and debugging information. Here are some 

possible failures you might meet and the corresponding troubleshooting methods. 

This indicates that an incorrect VRRP packet has been received. It may be because of 

the inconsistent configuration of another switch within the virtual router, or the attempt 

of some devices to send out illegal VRRP packets. The first possible fault can be solved 

through modifying the configuration. And as the second possibility is caused by the 

malicious attempt of some devices, non-technical measures should be resorted to. 

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.  

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.