New set-as-path BGP action, and support last AS for for setting AS path.

[xuqma]

Change Scope

• Add set-as-path BGP action to replacing the entire AS path attribute with the following new path:
  • /routing-policy/policy-definitions/policy-definition/statements/statement/actions/bgp-actions/set-as-path (a list of ASNs or last-as)
• Add oc-bgp-pol:bgp-as-mode-type to specify last AS in set-as-path.
  • This type is only used for BGP policies, so I decided to put it in oc-bgp-pol instead of oc-bgp-types.
• This change is backwards compatible.

New paths after the model update:

To be updated.

Platform Implementations

• Arista Implmentation: RCF as_path.replace and Route Map set as path all replacement.

[dplore]

/gcbrun

[OpenConfigBot]

No major YANG version changes in commit fd28c0449ab1a7e21dd1564be7e3d3c76d3c8dd7

[xuqma]

Removed the extra comma and rebased against master.

[dplore]

/gcbrun

[dplore]

/gcbrun

[dplore]

/gcbrun

[dplore]

/gcbrun

[dplore]

/gcbrun

[dplore]

LGTM, moving to last call for Jan 16, 2025

[xuqma]

Thanks Darren! I have fixed the revisions based on the previous check result.

[dplore]

Hi @xuqma , still waiting on your comment or changes. Probably this should just be changed to use the defined-sets for as-path.

ie: /routing-policy/defined-sets/bgp-defined-sets/as-path-sets/as-path-set/config/as-path-set-member