Validate VPC switches before ADD/REMOVE operation in network_attach_groups

[skaszlik]

Which role would this new feature be associated?

cisco.nac_dc_vxlan.validate

New feature description:

This rule ensures that any VPC switch referenced in overlay network attachments
(network_attach_groups) is also defined in topology.vpc_peers. This prevents the scenario where a user removes a VPC pairing but forgets to remove the network attachments, which would cause NDFC API failures with: "Switches [serial] have overlays. Please undeploy and try again"

Validation sequence matters:
    - When ADDING a VPC peer: First add to vpc_peers, then add to network_attach_groups
    - When REMOVING a VPC peer: First remove from network_attach_groups, then remove from vpc_peers

Would this be a new feature requiring a new role?

No

Which section of the data model is the new feature related?

vxlan.topology

Would this be a new feature requiring a new addition to the data model?

New or Affected Documentation for New Feature

Potential Ansible Task Config

Validation role

Ansible Version

Ansible Collection Versions

Cisco Nexus Dashboard Version

Cisco NX-OS Version