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Case Study: When the Active AC Is Faulty, APs on the Active AC Fail to Go Online on the Standby AC
Symptom
Two ACs are connected to APs. AC2 is configured as the standby AC on AC1, and a non-AC1 is configured as the standby AC on AC2. When AC1 fails, the APs that originally go online on AC1 do not go online on AC2.
Relevant Alarms and Logs
None
Cause Analysis
Check the configurations of AC1 and AC2. The dual-link backup function is disabled on AC1. Therefore, even if the standby AC IP address configured on AC1 is the same as the IP address of AC2, AP1 cannot switch to AC2 to go online after AC1 fails.
Procedure
- Check whether the dual-link backup function is enabled on AC1.
The command output shows that the dual-link backup function is disabled on AC1. Therefore, AP1 does not set up a standby link with AC2 after going online on AC1. When AC1 is faulty, AP1 goes offline and does not switch to AC2.
Suggestion and Summary
- This problem is generally caused by a failure to set up dual links. When this problem occurs, check whether dual links are set up.
- On the live network, the networking is complex. Therefore, it is difficult to quickly determine whether dual links are established. The common causes are listed above. When a fault occurs, you can check the preceding causes one by one. For details, see Failed to Set Up Dual Links.