Add RT-5.17: Physical Interface Drain via Admin Down test with ISIS and BGP in place specification

[navaneethyv]

PR DESCRIPTION:
This pull request introduces the new test specification and configuration for RT-5.17: Physical Interface Drain via Admin Down.

Summary
This test specification validates that administratively disabling a physical interface (enabled = false) via gNMI:

1. Triggers clean teardowns of associated routing protocol sessions (BGP peering sessions and IS-IS Level-2 adjacencies).
2. Ceases all traffic forwarding across the drained physical interface.
3. Ensures pass-through traffic across non-drained interfaces remains completely unaffected.
4. Restores routing sessions and traffic forwarding successfully once the interface is re-enabled (enabled = true).

[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 test specification, RT-5.17, designed to verify the behavior of physical interfaces when administratively disabled via gNMI. The test confirms that the control plane (BGP/IS-IS) and data plane react appropriately by tearing down sessions and stopping traffic, and that these services recover seamlessly once the interface is re-enabled. This ensures robust network management and stability during maintenance operations.

Highlights

• New Test Specification: Added a new test specification (RT-5.17) to validate physical interface draining via administrative down status.
• Routing Protocol Validation: The test ensures that BGP and IS-IS sessions tear down cleanly when an interface is disabled and restore correctly upon re-enabling.
• Traffic Isolation: Verified that traffic forwarding ceases on the drained interface while pass-through traffic on other interfaces remains unaffected.
• Registry Update: Registered the new test case in the testregistry.textproto file.

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[OpenConfigBot]

Pull Request Functional Test Report for #5808 / 8940d94

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-5.17: Physical Interface Drain via Admin Down	8b13a70e	Log
Cisco 8000E		RT-5.17: Physical Interface Drain via Admin Down	80b448e4	Log
Cisco XRd		RT-5.17: Physical Interface Drain via Admin Down	5207aeac	Log
Juniper ncPTX		RT-5.17: Physical Interface Drain via Admin Down	9f945458	Log
Nokia SR Linux		RT-5.17: Physical Interface Drain via Admin Down	ed5ed94e	Log
Openconfig Lemming		RT-5.17: Physical Interface Drain via Admin Down	efed12a7	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-5.17: Physical Interface Drain via Admin Down
Cisco 8808		RT-5.17: Physical Interface Drain via Admin Down
Juniper PTX10008		RT-5.17: Physical Interface Drain via Admin Down
Nokia 7250 IXR-10e		RT-5.17: Physical Interface Drain via Admin Down

Help

[gemini-code-assist]

Code Review

This pull request introduces a new test plan, RT-5.17: Physical Interface Drain via Admin Down, which includes a detailed README, metadata, and registration in the test registry. The review feedback suggests improving the test documentation by explicitly specifying the Network Instance (VRF) assignment (e.g., DEFAULT) for all interfaces in both the topology description and the setup procedure to ensure clarity.