TUN-1.3 Interface based IPv4 GRE Encapsulation

feature/experimental/tunnel/otg_tests/tunnel_interface_based_ipv4_gre_encapsulation_test/README.md

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+# TUN-1.3: Interface based IPv4 GRE Encapsulation
+
+## Summary
+
+Validate Interface based Ipv4 GRE Tunnel Config.
+
+## Procedure
+
+- Validate the GRE configuration
+  -  GRE Tunnel interfaces configuration options
+     -  Tunnel source
+     -  Tunnel source should be able to configure with unnumbered interface address
+     -  Tunnel Destination
+     -  Directly on Tunnel interface or Tunnel Group
+- Configure such 2000 tunnel interfaces
+- Configure static route with IPv4 NH pointing to Tunnel interfaces
+- Send 1000 IPv4 flows from tester on ATE-PORT1 connected to DUT-PORT1
+- Enable the packet capture on ATE ingress port to verify the GRE header of encapped traffic
+- Verify the tunnel interfaces counters to confirm the traffic encapsulation
+- After encapsulation, traffic should be load balanced/hash to all available L3 ECMP or LAG or combination of both features
+- Validate system for:
+  - TODO: Health-1.1
+  - TODO: No feature related error or drop counters incrementing, discussion with vendors required to highlight additional fields to monitor based on implementation and architecture
+
+## Config Parameter coverage
+
+- Prefix: wbb://software/interfaces/tunnel/
+- Parameters:
+  - gre/
+  - gre/decap-group/
+  - gre/dest/
+  - gre/dest/address/
+  - gre/dest/address/ipv4/
+  - gre/dest/nexthop-group/
+  - gre/source/
+  - gre/source/address/
+  - gre/source/address/ipv4/
+  - gre/source/interface/
+  - Prefix:
+  - wbb://software/routing/nexthop-group/
+  - wbb://software/routing/nexthop-group/gre/
+
+- Prefix:
+- wbb://software/routing/static/
+- Parameters:
+  - ipv4/
+  - ipv4/admin-dist/
+  - ipv4/nexthop/
+  - ipv4/nexthop/null/
+
+## Telemetry Parameter coverage
+
+- Prefix:
+- wbb://software/interfaces/tunnel/
+- wbb://software/interfaces/tunnel/gre/
+- Needs to define
+  - ST for Tunnel counters
+  - ST for packet capture on DUT and ATE to read:
+  - Packet metadata
+  - IP Source
+  - IP Destination
+  - IP Protocol number
+  - state/counters/in-pkts
+  - state/counters/in-octets
+  - state/counters/in-error-pkts
+  - state/counters/in-forwarded-pkts
+  - state/counters/in-forwarded-octets
+  - state/counters/in-discarded-pkts
+  - state/counters/out-pkts
+  - state/counters/out-octets
+  - state/counters/out-error-pkts
+  - state/counters/out-forwarded-pkts
+  - state/counters/out-forwarded-octets
+  - state/counters/out-discarded-pkt
+  - Fragmentation and assembly counters Filter counters Output to display the traffic is spread across the different tunnel subnet ranges/NH groups/Interfaces
+
+## OpenConfig Path and RPC Coverage
+```yaml
+rpcs:
+  gnmi:
+    gNMI.Get:
+    gNMI.Set:
+    gNMI.Subscribe:
+```

feature/experimental/tunnel/otg_tests/tunnel_interface_based_ipv4_gre_encapsulation_test/metadata.textproto

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+# proto-file: github.com/openconfig/featureprofiles/proto/metadata.proto
+# proto-message: Metadata
+
+uuid:  "10287306-7277-456a-ab43-99f63e991152"
+plan_id:  "TUN-1.3"
+description:  "Interface based IPv4 GRE Encapsulation"
+testbed:  TESTBED_DUT_ATE_4LINKS
+ platform_exceptions: {
+   platform: {
+     vendor: JUNIPER
+     hardware_model: "PTX10008"
+     hardware_model: "PTX10001-36MR"
+     hardware_model: "cptx"
+   }
+   deviations: {
+     tunnel_state_path_unsupported: true
+     tunnel_config_path_unsupported: true
+   }
+ }
+tags: TAGS_AGGREGATION