add capability to set anycast bgw (#429)

* update msd to assign anycast bgw

* update condition to configure anycast

* Revert changes

* Update sub_main_msd.yml

---------

Co-authored-by: Matt Tarkington <mtarking@cisco.com>

Author: ccoueffe

roles/dtc/common/tasks/msd/ndfc_anycast_bgw.yml

@@ -0,0 +1,81 @@
+# Copyright (c) 2025 Cisco Systems, Inc. and its affiliates
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+# SPDX-License-Identifier: MIT
+
+---
+- name: Initialize changes_detected Var
+  ansible.builtin.set_fact:
+    changes_detected_anycast_bgw: false
+  delegate_to: localhost
+
+- name: Set file_name Var
+  ansible.builtin.set_fact:
+    file_name: "ndfc_msd_anycast_bgw.yml"
+  delegate_to: localhost
+
+- name: Stat Previous File If It Exists
+  ansible.builtin.stat:
+    path: "{{ path_name }}{{ file_name }}"
+  register: data_file_previous
+  delegate_to: localhost
+
+- name: Backup Previous Data File If It Exists
+  ansible.builtin.copy:
+    src: "{{ path_name }}{{ file_name }}"
+    dest: "{{ path_name }}{{ file_name }}.old"
+  when: data_file_previous.stat.exists
+
+- name: Delete Previous Data File If It Exists
+  ansible.builtin.file:
+    state: absent
+    path: "{{ path_name }}{{ file_name }}"
+  delegate_to: localhost
+  when: data_file_previous.stat.exists
+
+- name: Build MSD Anycast BGW IP address allocation From Template
+  ansible.builtin.template:
+    src: ndfc_msd_anycast_bgw.j2
+    dest: "{{ path_name }}{{ file_name }}"
+  delegate_to: localhost
+
+- name: Create Empty msd_anycast_bgw Var
+  ansible.builtin.set_fact:
+    msd_anycast_bgw: []
+  delegate_to: localhost
+
+- name: Set msd_anycast_bgw Var
+  ansible.builtin.set_fact:
+    msd_anycast_bgw: "{{ lookup('file', path_name + file_name) | from_yaml }}"
+  delegate_to: localhost
+
+- name: Diff Previous and Current Data Files
+  cisco.nac_dc_vxlan.dtc.diff_model_changes:
+    file_name_previous: "{{ path_name }}{{ file_name }}.old"
+    file_name_current: "{{ path_name }}{{ file_name }}"
+  register: file_diff_result
+  delegate_to: localhost
+
+- name: Set File Change Flag Based on File Diff Result
+  ansible.builtin.set_fact:
+    changes_detected_anycast_bgw: true
+  delegate_to: localhost
+  when:
+    - file_diff_result.file_data_changed
+    - check_roles['save_previous']

roles/dtc/common/tasks/sub_main_msd.yml

@@ -52,6 +52,13 @@
 - name: Build NDFC Child Fabric Inventory List From Template
   ansible.builtin.import_tasks: msd/ndfc_child_fabrics.yml
 
+# --------------------------------------------------------------------
+# Build NDFC Child Fabric Anycast BGW List From Template
+# --------------------------------------------------------------------
+
+- name: Build NDFC Child Fabric Anycast BGW List From Template
+  ansible.builtin.import_tasks: msd/ndfc_anycast_bgw.yml
+
 # --------------------------------------------------------------------
 # Build NDFC Fabric VRFs Attach List From Template
 # --------------------------------------------------------------------
@@ -73,9 +80,11 @@
   ansible.builtin.set_fact:
     vars_common_msd:
         changes_detected_fabric: "{{ changes_detected_fabric }}"
+        changes_detected_anycast_bgw: "{{ changes_detected_anycast_bgw }}"
         # changes_detected_vrfs: "{{ changes_detected_vrfs }}"
         # changes_detected_networks: "{{ changes_detected_networks }}"
         fabric_config: "{{ fabric_config }}"
+        msd_anycast_bgw: "{{ msd_anycast_bgw }}"
         # vrf_config: "{{ vrf_config }}"
         # net_config: "{{ net_config }}"
         # Check with Matt and Pete on how to handle this for MSD
@@ -86,6 +95,7 @@
     msg:
       - "----------------------------------------------------------------"
       - "+     Fabric Changes Detected -               [ {{ vars_common_msd.changes_detected_fabric }} ]"
+      - "+     Anycast Gateway Changes Detected -      [ {{ vars_common_msd.changes_detected_anycast_bgw }} ]"
       # - "+     VRFs Changes Detected -                 [ {{ vars_common_msd.changes_detected_vrfs }} ]"
       # - "+     Networks Changes Detected -             [ {{ vars_common_msd.changes_detected_networks }} ]"
       - "+     ----- Run Map -----"

roles/dtc/common/templates/ndfc_msd_anycast_bgw.j2

@@ -0,0 +1,15 @@
+# This NDFC anycast gateway structure is auto-generated
+# DO NOT EDIT MANUALLY
+#
+
+{% set anycast_lo_id = vxlan.multisite.vtep_loopback_id | default(defaults.vxlan.multisite.vtep_loopback_id) %}
+
+{% for fabric in vxlan.multisite.child_fabrics %}
+{% if fabric.anycast_bgw_ipv4 is defined %}
+- entity_name: "{{ fabric.name }}"
+  pool_type: IP
+  pool_name: "LOOPBACK{{ anycast_lo_id }}_IP_POOL"
+  scope_type: fabric
+  resource: "{{ fabric.anycast_bgw_ipv4 }}"
+{% endif %}
+{% endfor %}

roles/dtc/create/tasks/sub_main_msd.yml

@@ -52,9 +52,17 @@
   register: MD_Multisite
   tags: "{{ nac_tags.create_vrfs_networks }}"
 
+- name: Create Anycast Loopback Border Gateway site in NDFC
+  cisco.dcnm.dcnm_resource_manager:
+    state: merged
+    fabric: "{{ MD_Extended.vxlan.fabric.name }}"
+    config: "{{ vars_common_msd.msd_anycast_bgw }}"
+  when:
+    - vars_common_msd.msd_anycast_bgw | length > 0
+
 - name: Manage NDFC MSD Fabric VRFs and Networks
   ansible.builtin.import_tasks: msd/vrfs_networks.yml
-  when: 
+  when:
     - MD_Extended.vxlan.multisite.overlay is defined
     - MD_Extended.vxlan.multisite.overlay
     # - (vars_common_msd.changes_detected_vrfs or vars_common_msd.changes_detected_networks)