Introduce recurse action in policy-forwarding

[amitarista]

Change Scope

• Introduce recurse within /network-instances/network-instance/policy-forwarding/policies/policy/rules/rule/action/
• This change is backwards compatible.

Platform Implementations

Arista implementation document - https://www.arista.com/en/support/toi/eos-4-20-5f/14550#redirect-next-hop

Example config:

traffic-policies
   traffic-policy foo
      match m1 ipv4
         source prefix 10.0.0.0/24
         actions
            redirect next-hop recursive 20.0.0.1 <-- EXCLUDE_DEFAULT_RT
      match m2 ipv4
         source prefix 30.0.0.0/24
         actions
            redirect next-hop recursive include default 40.0.0.1 <-- INCLUDE_DEFAULT_RT

Tree View

         +--rw policy-forwarding
         |  +--rw policies
         |  |  +--rw policy* [policy-id]
         |  |     +--rw rules
         |  |        +--rw rule* [sequence-id]
         |  |           +--rw action
         |  |           |  +--rw config
         |  |              |  +--rw log?                               boolean
         |  |              |  +--rw post-decap-network-instance?       -> /network-instances/network-instance/config/name
         |  |              |  +--rw network-instance?                  -> /network-instances/network-instance/config/name
         |  |              |  +--rw path-selection-group?              -> ../../../../../../../path-selection-groups/path-selection-group/config/group-id
         |  |              |  +--rw next-hop?                          oc-inet:ip-address
+        |  |              |  +--rw recurse?                           enumeration
         |  |              |  +--rw next-hop-group?                    -> ../../../../../../../../static/next-hop-groups/next-hop-group/config/name
         |  |              |  +--rw decapsulate-mpls-in-udp?           boolean
         |  |              |  +--rw decapsulate-gue?                   boolean
         |  |              |  x--rw ip-ttl?                            uint8
         |  |              +--ro state
@@ -1569,10 +1570,11 @@
         |  |              |  +--ro log?                               boolean
         |  |              |  +--ro post-decap-network-instance?       -> /network-instances/network-instance/config/name
         |  |              |  +--ro network-instance?                  -> /network-instances/network-instance/config/name
         |  |              |  +--ro path-selection-group?              -> ../../../../../../../path-selection-groups/path-selection-group/config/group-id
         |  |              |  +--ro next-hop?                          oc-inet:ip-address
+        |  |              |  +--ro recurse?                           enumeration
         |  |              |  +--ro next-hop-group?                    -> ../../../../../../../../static/next-hop-groups/next-hop-group/config/name
         |  |              |  +--ro decapsulate-mpls-in-udp?           boolean
         |  |              |  +--ro decapsulate-gue?                   boolean
         |  |              |  x--ro ip-ttl?                            uint8
         |  |              +--rw encapsulate-gre

[gemini-code-assist]

Code Review

This pull request introduces a new recurse leaf to the policy-forwarding action configuration, allowing recursive next-hop resolution via longest prefix match in the FIB. Feedback was provided to clarify the description of the recurse leaf, suggesting to replace 'If not enabled' with 'If this leaf is not configured' to avoid ambiguity since it is an optional enumeration rather than a boolean.