Add bgp_device_global yang model

src/sonic-yang-models/doc/Configuration.md

@@ -9,6 +9,7 @@ Table of Contents
          * [Incremental Configuration](#incremental-configuration)  
    * [<strong>Redis and Json Schema</strong>](#redis-and-json-schema)  
          * [ACL and Mirroring](#acl-and-mirroring)  
+         * [BGP Device Global](#bgp-device-global)  
          * [BGP Sessions](#bgp-sessions)  
          * [BUFFER_PG](#buffer_pg)  
          * [Buffer pool](#buffer-pool)  
@@ -335,7 +336,21 @@ and migration plan
     }
 }
 ```
+### BGP Device Global 
 
+The **BGP_DEVICE_GLOBAL** table contains device-level BGP global state. 
+It has a STATE object containing device state like **tsa_enabled** 
+which is set to true if device is currently isolated using 
+traffic-shift-away (TSA) route-maps in BGP
+
+```
+{
+"BGP_DEVICE_GLOBAL": {
+    "STATE": {
+        "tsa_enabled": "true"
+    }
+}
+```
 ### BGP Sessions
 
 BGP session configuration is defined in **BGP_NEIGHBOR** table. BGP

src/sonic-yang-models/setup.py

@@ -80,6 +80,7 @@ def run(self):
         ('yang-models', ['./yang-models/sonic-acl.yang',
                          './yang-models/sonic-auto_techsupport.yang',
                          './yang-models/sonic-bgp-common.yang',
+                         './yang-models/sonic-bgp-device-global.yang',
                          './yang-models/sonic-bgp-global.yang',
                          './yang-models/sonic-bgp-monitor.yang',
                          './yang-models/sonic-bgp-internal-neighbor.yang',

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -1305,6 +1305,11 @@
             "default|ipv4_unicast|21.0.0.0/8": {
             }
         },
+        "BGP_DEVICE_GLOBAL": {
+            "STATE": {
+                "tsa_enabled": "false"
+            }
+        },
         "BGP_PEER_RANGE": {
             "BGPSLBPassive": {
                 "ip_range": [

src/sonic-yang-models/tests/yang_model_tests/tests/bgp_device_global.json

@@ -0,0 +1,16 @@
+{
+    "BGP_DEVICE_GLOBAL_WITH_DEFAULT_VALUES": {
+        "desc": "Load bgp device global table with fields set to default values"
+    },
+    "BGP_DEVICE_GLOBAL_WITH_TSA_TEST": {
+        "desc": "Load bgp device global table with tsa_enabled set to true"
+    },
+    "BGP_DEVICE_GLOBAL_WITH_TSB_TEST": {
+        "desc": "Load bgp device global table with tsa_enabled set to false"        
+    },
+    "BGP_DEVICE_GLOBAL_WITH_INVALID_VALUE": {
+        "desc": "Load bgp device global table with invalid value",
+        "eStrKey": "InvalidValue",
+        "eStr": ["tsa_enabled"]
+    }
+}

src/sonic-yang-models/tests/yang_model_tests/tests_config/bgp_device_global.json

@@ -0,0 +1,38 @@
+{
+    "BGP_DEVICE_GLOBAL_WITH_DEFAULT_VALUES": {
+        "sonic-bgp-device-global:sonic-bgp-device-global": {
+            "sonic-bgp-device-global:BGP_DEVICE_GLOBAL": {
+                "STATE":{
+                    "tsa_enabled": "false"
+                }
+            }
+        }
+    },
+    "BGP_DEVICE_GLOBAL_WITH_TSA_TEST": {
+        "sonic-bgp-device-global:sonic-bgp-device-global": {
+            "sonic-bgp-device-global:BGP_DEVICE_GLOBAL": {
+                "STATE":{
+                    "tsa_enabled": "true"
+                }
+            }
+        }
+    },
+    "BGP_DEVICE_GLOBAL_WITH_TSB_TEST": {
+        "sonic-bgp-device-global:sonic-bgp-device-global": {
+            "sonic-bgp-device-global:BGP_DEVICE_GLOBAL": {
+                "STATE":{
+                    "tsa_enabled": "false"
+                }
+            }
+        }
+    },
+    "BGP_DEVICE_GLOBAL_WITH_INVALID_VALUE": {
+        "sonic-bgp-device-global:sonic-bgp-device-global": {
+            "sonic-bgp-device-global:BGP_DEVICE_GLOBAL": {
+                "STATE":{
+                    "tsa_enabled": "FALSE"
+                }
+            }
+        }
+    }
+}

src/sonic-yang-models/yang-models/sonic-bgp-device-global.yang

@@ -0,0 +1,36 @@
+module sonic-bgp-device-global {
+    namespace "http://github.com/Azure/sonic-bgp-device-global";
+    prefix bgp_device_global;
+    yang-version 1.1;
+
+    organization
+        "SONiC";
+
+    contact
+        "SONiC";
+
+    description
+        "SONIC Device-specific BGP global data";
+
+    revision 2022-06-26 {
+        description
+            "Initial revision";
+    }
+
+    container sonic-bgp-device-global {
+        container BGP_DEVICE_GLOBAL {
+            container STATE {
+                description "BGP device-specific global data";
+                leaf tsa_enabled {
+                    type boolean;
+                    default "false";
+                    description
+                    "When set to true, Traffic is shifted away (TSA), i.e, BGP routes are not advertised to neighboring routers";
+                }
+            } /* end of STATE container */
+        } /* end of BGP_DEVICE_GLOBAL container */
+
+    } /* end of top level container */
+
+} /* end of module sonic-bgp-device-global */
+