Added WRED with affected Leaf/LC/FM model check

[Priyanka-Patil14]

Summary

Adds a new pre-upgrade validation check to detect fabric nodes at risk due to CSCwt50713, where WRED-enabled QoS combined with specific Leaf/LC/FM hardware models can cause N9504 spine crashes after upgrading to affected ACI releases.

Detection Logic

Three gates must all be true to trigger a FAIL:

1. Version Gate – Target version is in the affected range:

   • ACI 6.1(x) older than 6.1(6a)
   • ACI 6.2(x) older than 6.2(2a)

2. Feature Gate – WRED is enabled (qosCong.algo = wred)

3. Hardware Gate – Any of the following affected models are present:

   • Leaf: N9K-C9236C, N9K-C92300YC, N9K-C9272Q, N9K-C92304QC
   • LC: N9K-C92304QC
   • FM: N9K-C9504-FM-E, N9K-C9508-FM-E, N9K-C9516-FM-E

Testing

• 5 unit test cases added under tests/checks/wred_affected_model_check/
• All 5 passed
• Validated on live fabric (fab3-apic1): confirmed FAIL_O with real hit on node 201 (FAB3-S1, N9K-C9504-FM-E)

[Priyanka-Patil14]

WredCheck_APIC_Output_logs.txt
WredCheck_Pytest_Logs.txt

Uploaded the test logs.

[Harinadh-Saladi]

Pls address the comments given and also Pls add the bug details in validations.md file. It's missing.
Pls execute the script on Fab3 and share PASS, FAIL and NA logs. Will review it.

[Priyanka-Patil14]

Pls address the comments given and also Pls add the bug details in validations.md file. It's missing. Pls execute the script on Fab3 and share PASS, FAIL and NA logs. Will review it.

WRED_PASS:FAIL:NA_APIC_Logs.txt

Please find the attached logs. Executed on fab3 for PASS, FAIL and NA scenario.

[lovkeshsharma702]

please work on all comments.

[lovkeshsharma702]

work on comments

[Harinadh-Saladi]

Pls address the comments. If there is any different understanding with me in the test results or technical aspects, will discuss with team and address after getting the confirmation.

[lovkeshsharma702]

please sort the other comments and we are good.