3Com S7902E, Configuration Manual

Page: 2126 / 2621

1-53
The above information indicates that if Switch A fails, Switch B becomes the master, Switch C becomes
the AVF among the VFs corresponding to the virtual MAC address 000f-e2ff-4011, and packets sent
from Host A to the external network are forwarded by Switch C.
Troubleshooting VRRP
Symptom 1:
The screen displays error prompts frequently.
Analysis:
This error is probably caused by the following:
z
Inconsistent configuration of the devices in the VRRP group.
z
A device is attempting to send illegitimate VRRP packets.
Solution:
z
In the first case, modify the configuration.
z
In the latter case, you have to resort to non-technical measures.
Symptom 2:
Multiple masters are present in the same VRRP group.
Analysis:
z
Multiple masters coexist for a short period: This is normal and requires no manual intervention.
z
Multiple masters coexist for a long period: This is because devices in the VRRP group cannot
receive VRRP packets, or the received VRRP packets are illegal.
Solution:
Ping between these masters, and do the following:
z
If the ping fails, check network connectivity.
z
If the ping succeeds, check that their configurations are consistent in terms of number of virtual IP
addresses, virtual IP addresses, advertisement interval, and authentication.
Symptom 3:
Frequent VRRP state transition.
Analysis:
The VRRP advertisement interval is set too short.
Solution:
Increase the interval to sent VRRP advertisement or introduce a preemption delay.