Adding IPv6 outer header usecases for UDP and GRE encaps

[nkhambal]

This PR adds test case coverage for using IPv6 outer header for MPLSoverGRE and MPLSoverUDP encap and decap test cases, in addition to IPv4 outer header

[OpenConfigBot]

Pull Request Functional Test Report for #5470 / d8e02f7

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Cisco 8000E		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Cisco XRd		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Juniper ncPTX		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Nokia SR Linux		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Openconfig Lemming		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Cisco 8808		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Juniper PTX10008		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL
Nokia 7250 IXR-10e		PF-1.25: Egress Static MPLS LSP Verification PF-1.17: MPLSoGRE and MPLSoGUE MACsec PF-1.18: MPLSoGRE and MPLSoGUE QoS PF-1.20: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload scale test PF-1.19: MPLSoGUE IPV4 decapsulation of IPV4/IPV6 payload PF-1.9: Egress handling of TTL

Help

[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 expands the test suite coverage for MPLS over GRE/UDP encapsulation and decapsulation by introducing support for IPv6 outer headers. The changes include detailed test procedures, configuration examples, and telemetry validation steps for multiple scenarios, including MACsec-encrypted links, QoS-aware forwarding, and high-scale decapsulation performance.

Highlights

• IPv6 Outer Header Support: Added comprehensive test coverage for IPv6 outer header encapsulation and decapsulation across various MPLS, GRE, and UDP scenarios.
• MACsec Integration: Included new test cases for validating MPLS over GRE/UDP over IPv6 encapsulation specifically over MACsec-encrypted links.
• QoS and Scale Testing: Added test documentation for QoS prioritization with IPv6 outer headers and scaled decapsulation testing for 1000 unique IPv6 flows.

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[gemini-code-assist]

Code Review

This pull request adds several new test plans (PF-1.25.v6, PF-1.17.6, PF-1.17.v6, PF-1.18.v6, PF-1.20.v6, and PF-1.19.v6) focused on validating MPLS static LSPs and various encapsulation/decapsulation methods (GRE, UDP, GUE) using IPv6, covering MACsec, QoS, and scale scenarios. Feedback indicates that several Canonical OC configurations are incomplete, specifically missing the 'rules' container or detailed match/action criteria for policy forwarding. Additionally, the 'decapsulate-mpls-in-udp' leaf needs to be corrected to a boolean type and added where missing to properly trigger decapsulation.