Adding gribi test cases for higher IPv4 and IPv6 tunnel scale

[nkhambal]

This PR adds 2 new scale profiles. First profile is for 32K IPv4 tunnels with 16 NHs per NHG and 26K IPv6 tunnels with 16 NHs per NHG. Both profiles use 1024 VRFs.

[gemini-code-assist]

Summary of Changes

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This pull request introduces two new scale profiles to the gRIBI testing suite to validate higher tunnel density and ECMP configurations. The changes include defining the necessary parameters and validation steps for testing 32K IPv4 and 26K IPv6 tunnels, ensuring the control plane can handle increased scale across multiple VRFs.

Highlights

• New Scale Profiles: Added two new test profiles (Profile 6 and 7) to support higher IPv4 and IPv6 tunnel scaling, featuring 32K and 26K Next Hops respectively across 1024 VRFs.
• Documentation Updates: Updated the README to include parameters for the new profiles, validation procedures, and expanded OpenConfig path requirements for UDPv4 encapsulation.

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[OpenConfigBot]

Pull Request Functional Test Report for #5474 / be439bd

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Cisco 8000E		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Cisco XRd		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Juniper ncPTX		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Nokia SR Linux		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Openconfig Lemming		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Cisco 8808		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Juniper PTX10008		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test
Nokia 7250 IXR-10e		TE-18.1: gRIBI MPLS-in-UDP Encapsulation TE-18.3: MPLS in UDP Encapsulation Scale Test

Help

[gemini-code-assist]

Code Review

This pull request introduces Profiles 6 and 7 to the MPLS-in-UDP scale tests, adding documentation for multi-VRF scaling with 16-way ECMP using IPv4 and IPv6 outer headers. It includes new scale parameters, detailed test procedures, and additional OpenConfig paths for UDP-v4 encapsulation state. The review feedback correctly identifies that the chosen IPv4 base addresses for scaling (192.0.2.1 and 203.0.113.1) will exceed the allowed RFC 5737 /24 blocks defined in the style guide when incremented to the target scale; larger blocks such as 100.64.0.0/10 are recommended.