Add TE-2.3 gRIBI IPv6 entry test with prefix lengths > 64

[nafis-google]

Implement test plan TE-2.3 for IPv6 in featureprofiles under feature/gribi/otg_tests/ipv6_entry_test, branched out of ipv4_entry_test. It is simply ipv4 tests modified with ipv6 params.

Validates gRIBI IPv6 route programming and forwarding for prefix lengths strictly greater than /64, including:

• Boundary prefix length sweeps (/65, /96, /126, /127, /128)
• Longest Prefix Match (LPM) discrimination (/64 vs /65)
• Multipath / ECMP across multiple next-hops
• MAC address overwrite
• Downed interface packet drop
• gRIBI FlushAll

This test tries to install static IPV6, Next-hop and Next-hop-group and validates correct traffic matching.

[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 automated test suite for gRIBI IPv6 entry handling, specifically targeting prefix lengths exceeding 64 bits. The implementation ensures that device agents and switch ASICs correctly manage longer IPv6 prefixes without truncation or lookup failures, providing robust validation for complex routing scenarios.

Highlights

• New Test Implementation: Implemented test plan TE-2.1 to validate gRIBI IPv6 route programming and forwarding for prefix lengths greater than 64 bits.
• Comprehensive Test Coverage: The test suite covers boundary prefix length sweeps, Longest Prefix Match (LPM) discrimination, ECMP, MAC address override, and interface failure scenarios.
• Platform Support: Added platform-specific deviations for Cisco, Juniper, Nokia, and Arista to ensure cross-vendor compatibility.

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[OpenConfigBot]

Pull Request Functional Test Report for #6012 / 60c95b0

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64	2a08a418	Log
Cisco 8000E		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64	5063cc3a	Log
Cisco XRd		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64	3c9db791	Log
Juniper ncPTX		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64	b9fe26e4	Log
Nokia SR Linux		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64	14b49ea0	Log
Openconfig Lemming		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64	1d6f2175	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64
Cisco		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64
Juniper		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64
Nokia		TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64

Help

[gemini-code-assist]

Code Review

This pull request implements the TE-2.1 test plan to validate gRIBI IPv6 route entry support for prefix lengths strictly greater than 64 bits, including test cases for single/multiple next-hops, MAC overrides, downed interfaces, LPM discrimination, and boundary prefix sweeps. The feedback recommends aligning the test implementation with the repository style guide by calling otgutils.WaitForARP before starting traffic to ensure deterministic neighbor resolution, and refactoring the staticARPWithMagicUniversalIP helper to register its cleanup operations using t.Cleanup() directly inside the function.