1-18Troubleshooting VRRPYou can locate VRRP problems through the configuration and debugging information. Here are somepossible symptoms you might meet and the corresponding troubleshooting methods.Symptom 1: Frequent prompts of configuration errors on the consoleThis indicates that incorrect VRRP packets are received. It may be because of the inconsistentconfiguration of the switches within the VRRP group, or the attempt of other devices sending illegalVRRP packets.z The first possible fault can be solved through modifying the configuration.z The second possibility is caused by the malicious attempt of some devices; non-technicalmeasures should be taken to solve the problem.Symptom 2: More than one master existing within a VRRP groupThere are also 2 reasons. One is short coexistence of many masters, which is normal and needs nomanual intervention. Another is long coexistence of many masters, which may be caused because theoriginal master and other member switches in a VRRP group cannot receive VRRP packets from eachother, or receive some illegal packets.To solve such a problem:z An attempt should be made to ping among these masters.z If such an attempt fails, check the connectivity between related devices.z If they can be pinged, check VRRP configuration.z For the configuration of a VRRP group, complete consistency for the number of virtual IPaddresses, each virtual IP address, timer interval and authentication type configured on eachmember switch must be guaranteed.Symptom 3: VRRP state of a switch changing repeatedlySuch problems occur when the VRRP group timer interval is too short. They can be solved throughprolonging the interval or configuring the preemption delay period.
