Optical signal issues after C9300 reboot.
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01-15-2024 10:48 PM
Hi.
We are using model C9300-24S-A and 17.9.3 OS version.
HSRP is configured with 2 switch, and the firewall on the upper uplink is operating as Active-Passvie.
If switch 1 is rebooted due to a failure scenario, switch 2 becomes the HSRP Act.
Firewall 2 will also be converted to Act.
And when switch 1 completes rebooting, it sends out a signal before the status of the fiber (SFP) port becomes "up",
so firewall 1 receives this signal and fails-back occurs.
20 to 30 seconds after the firewall fail-back, the status of the ports on switch 1 becomes "up" and communication is established, causing a problem.
This problem can be resolved by using EEM, but I am curious as to whether this is the correct action.
Our site uses the switches below with the same configuration, but the same symptom is not occurring.
C9500-16/24/40X-A, N9K-C9504/9508, N9K-C93180YC-FX3
Only the C9300-24S model is causing a problem by sending an optical signal after rebooting and before the port status is up (the Port Led is also off).
I also tried downgrading the OS to 16.x.x or upgrading it to 17.12.x, but it is the same.
Please help.
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Catalyst 9000
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01-16-2024 01:10 AM
Post the diagram, if you using sync link via these switches and Monitoring that is expected behavior (as you mentioned)
if you have sync/state link back to back you only Monitor that link the Firewall should work as expected technically.
