Adding aggregare drain test

[rohit-rp]

System Test Plan see for more info: b/540868611

• Objective: Verify that administratively disabling a LAG interface (e.g., Port-Channel) via gNMI brings down associated protocols and stops all traffic on the aggregate.
  • Interfaces Used: gNMI, BGP/ISIS, Traffic Generator
  • Expected Outcome Summary: Similar to 7.1, but applied to the LAG master interface.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! 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 introduces a new system test plan designed to validate the administrative drain functionality of Link Aggregation Group (LAG) interfaces. By leveraging gNMI to toggle the interface status, the test ensures that traffic is properly stopped and routing protocols (BGP/IS-IS) react as expected, maintaining network stability and correct operational states.

Highlights

• New Test Case Added: Added a new system test (RT-5.17) to verify that administratively disabling a LAG interface via gNMI correctly drains traffic and brings down associated protocols.
• Test Documentation: Created a comprehensive README detailing the test procedure, environment setup, and expected OpenConfig path coverage.
• Registry Update: Registered the new test case in the global test registry to ensure it is tracked and accessible.

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[OpenConfigBot]

Pull Request Functional Test Report for #5984 / f1f6e89

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down	911cb1d7	Log
Cisco 8000E		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down	224fe427	Log
Cisco XRd		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down	13affcc2	Log
Juniper ncPTX		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down	053edf7a	Log
Nokia SR Linux		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down	d5136047	Log
Openconfig Lemming		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down	1fb5e7e2	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down
Cisco		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down
Juniper		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down
Nokia		RT-5.17: Aggregate Interface (LAG) Drain via Admin Down

Help

[gemini-code-assist]

Code Review

This pull request introduces a new test plan (RT-5.17) for Aggregate Interface (LAG) Drain via Admin Down, including a README, metadata, and registration in testregistry.textproto. The review feedback highlights a critical mismatch where the metadata file specifies a 2-link testbed (TESTBED_DUT_ATE_2LINKS) while the README requires a 4-port topology (atedut_4.testbed). Additionally, a minor consistency improvement is suggested for the phrasing of steps in the README.