Adding IS-IS suppress interface reachability test plan

[AsliSevil]

Description

This PR adds the test plan and test registry entry for RT-2.19: IS-IS Suppress Interface Reachability.

Summary of Changes:

• feature/isis/otg_tests/isis_suppress_interface_reachability_test/README.md: Test plan covering telemetry state checks and ATE LSP verification across suppression modes (NONE, ALL, NON_PASSIVE, NON_PASSIVE_POINT_TO_POINT).
• testregistry.textproto: Registered test RT-2.19.

Testbed:

• topologies/atedut_2.testbed

[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 plan for validating IS-IS interface reachability suppression. It outlines procedures to verify that the Device Under Test (DUT) correctly handles prefix reachability advertisement across different suppression modes while maintaining stable IS-IS adjacencies.

Highlights

• New Test Plan: Added a comprehensive test plan for RT-2.19: IS-IS Suppress Interface Reachability, covering various suppression modes and telemetry verification.
• Test Registration: Registered the new test case RT-2.19 in the test registry.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize the Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counterproductive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for GitHub and other Google products, sign up here.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[OpenConfigBot]

Pull Request Functional Test Report for #5998 / ace0024

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-2.19: IS-IS Suppress Interface Reachability
Cisco 8000E		RT-2.19: IS-IS Suppress Interface Reachability
Cisco XRd		RT-2.19: IS-IS Suppress Interface Reachability
Juniper ncPTX		RT-2.19: IS-IS Suppress Interface Reachability
Nokia SR Linux		RT-2.19: IS-IS Suppress Interface Reachability
Openconfig Lemming		RT-2.19: IS-IS Suppress Interface Reachability

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista		RT-2.19: IS-IS Suppress Interface Reachability
Cisco		RT-2.19: IS-IS Suppress Interface Reachability
Juniper		RT-2.19: IS-IS Suppress Interface Reachability
Nokia		RT-2.19: IS-IS Suppress Interface Reachability

Help

[gemini-code-assist]

Code Review

This pull request introduces a new test plan (RT-2.19) for validating IS-IS Suppress Interface Reachability, including a detailed README.md and metadata.textproto. The reviewer feedback suggests formatting subtest headings to match the test plan template, explicitly utilizing t.Cleanup() for configuration restoration in the test plan steps, and adding the missing state path /network-instances/network-instance/protocols/protocol/isis/global/state/net to the coverage section for completeness.