RT-1.12: Enhance BGP MED removal test by adding session refresh logic and verification

[karthikeya-remilla]

This is a clone of PR #4370. Raised this so the team can address comments instead of an individual account.

[gemini-code-assist[bot]]

Summary of Changes

Hello @karthikeya-remilla, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines a BGP test case by integrating a comprehensive session refresh and verification mechanism. The primary goal is to ensure that when BGP MED settings are removed, the network correctly processes these changes, and BGP sessions are properly re-established, leading to more reliable and accurate test results for BGP policy modifications.

Highlights

• Enhanced BGP MED Removal Test: The existing test for removing BGP MED settings on the Device Under Test (DUT) has been significantly enhanced to ensure more robust verification.
• BGP Session Refresh Logic: New logic has been introduced to explicitly force a BGP session refresh. This involves programmatically disabling and then re-enabling BGP neighbors to ensure all routes are re-advertised and policies are fully applied.
• Comprehensive Session Verification: Added steps to verify that BGP sessions go down completely after being disabled and successfully re-establish after being re-enabled, using both DUT and OTG telemetry.
• Improved Route Processing Wait Times: Additional wait times have been incorporated to allow for complete route processing after policy changes and session refreshes, ensuring the test accurately reflects network convergence.

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[OpenConfigBot]

Pull Request Functional Test Report for #4785 / a9f76a7d23f692110fde3e8612fec1564d768346

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-1.12: BGP always compare MED
Cisco 8000E		RT-1.12: BGP always compare MED
Cisco XRd		RT-1.12: BGP always compare MED
Juniper ncPTX		RT-1.12: BGP always compare MED
Nokia SR Linux		RT-1.12: BGP always compare MED
Openconfig Lemming		RT-1.12: BGP always compare MED

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-1.12: BGP always compare MED
Cisco 8808		RT-1.12: BGP always compare MED
Juniper PTX10008		RT-1.12: BGP always compare MED
Nokia 7250 IXR-10e		RT-1.12: BGP always compare MED

Help

[coveralls]

Pull Request Test Coverage Report for Build 19163346966

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 10.942%

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Totals
Change from base Build 19162254605:	0.0%
Covered Lines:	2224
Relevant Lines:	20325

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💛 - Coveralls