3com 3.01.01 Benutzerhandbuch

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Configuring VRRP
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Create virtual router 2. 
[SW8800_B-vlan-interface2]vrrp vrid 2 virtual-ip 202.38.160.112
Set the priority for the virtual router. 
[SW8800_B-vlan-interface2]vrrp vrid 2 priority 110
Troubleshooting VRRP
The configuration of VRRP is simple so almost all troubleshooting can be done by 
viewing the configuration and debugging information. Here are some possible 
failures you might experience and the corresponding troubleshooting methods.
Tasks for Troubleshooting VRRP are described in the following sections:
Frequent Prompts of Configuration Errors on the Console
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 by modifying the configuration. Because the 
second possibility is caused by the malicious attempt of some devices, you should 
resort to non-technical measures.
More than One Master Exists Within the Same Virtual Router
One possible reason for this situation is the short-time coexistence of many master 
switches; which is normal and needs no manual intervention. 
Another possible reason is the coexistence of many master switches over a long 
period of time, because several masters cannot receive VRRP packets from each 
other, or because they have received illegal packets.
To solve this problem, ping the Master switches. If pinging fails, there are other 
problems. If the masters can be pinged, it indicates that the problems are caused 
by an inconsistent configuration. For the configuration of the same VRRP virtual 
router, the number of virtual IP addresses, each virtual IP address, timer duration, 
and authentication type, must be consistent. 
Frequent Switchover of VRRP State
This problem occurs when the virtual router timer duration is set too short. 
Increase the duration of the timer or configure a preemption delay.