03-06-2024 05:06 PM
Hi, I am looking for a better redundancy outcome, not to mention better understanding, given this scenario just experienced. A pair of SSO 9800-40s connected to a par of 9606s in SVL where a port channel member on the core side connecting to the active Primary starts flapping once per second due to a faulty transceiver with the result bringing down over one third of the APs across random vlans (clearly the load balancing hash algorithm sending traffic to the bit bucket). Should I not expect the 9800 side member interface to go down and failover to the standby, or said differently, is there a configuration to detect this link flapping such that the near end member signals a failover? Thanks in advance.
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03-06-2024 07:33 PM
the failover scenarios are different - i think your situation its going up and down in seconds may not detected as failure i guess.(again what interface is that connected to WLC ?)
As i mentioned again depends how this connected each other - RP connected back to back ?
check some failure scenarios :
https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2022/pdf/BRKEWN-2846.pdf
03-06-2024 11:36 PM - edited 03-07-2024 01:21 AM
>... is there a configuration to detect this link flapping such that the near end member signals a failover?
- In general HA-SSO targets box failure and not link flapping (the latter argument being 'enforced' by the fact that link flapping is 'outside' of the 9800 controller HA architecture) ; you may look for improvements in the (HA-SSO) configuration by using the CLI command (on the primary controller) show tech wireless and feed the output into Wireless Config Analyzer
But the link should be repaired ASAP ,
M.
03-06-2024 07:33 PM
the failover scenarios are different - i think your situation its going up and down in seconds may not detected as failure i guess.(again what interface is that connected to WLC ?)
As i mentioned again depends how this connected each other - RP connected back to back ?
check some failure scenarios :
https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2022/pdf/BRKEWN-2846.pdf
03-06-2024 11:36 PM - edited 03-07-2024 01:21 AM
>... is there a configuration to detect this link flapping such that the near end member signals a failover?
- In general HA-SSO targets box failure and not link flapping (the latter argument being 'enforced' by the fact that link flapping is 'outside' of the 9800 controller HA architecture) ; you may look for improvements in the (HA-SSO) configuration by using the CLI command (on the primary controller) show tech wireless and feed the output into Wireless Config Analyzer
But the link should be repaired ASAP ,
M.
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