[Link Event Damping] Add YANG model for dampening configuration

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

@@ -175,8 +175,22 @@
     },
     "PORT_WITH_NO_LANES_ON_MULT_ASIC_VS_2": {
         "desc": "PORT_WITH_NO_LANES_ON_MULT_ASIC_VS_2 no failure."
+    },
+    "PORT_VALID_DAMPING_AIED_TEST": {
+        "desc": "PORT_VALID_DAMPING_AIED_TEST no failure."
+    },
+    "PORT_VALID_DAMPING_AIED_MONITOR_TEST": {
+        "desc": "PORT_VALID_DAMPING_AIED_MONITOR_TEST no failure."
+    },
+    "PORT_INVALID_DAMPING_ALGORITHM_TEST": {
+        "desc": "PORT_INVALID_DAMPING_ALGORITHM_TEST invalid algorithm pattern failure.",
+        "eStrKey" : "Pattern",
+        "eStr": ["disabled|aied|aied-monitor"]
+    },
+    "PORT_INVALID_DAMPING_HALFLIFE_GT_MAXSUPPRESS_TEST": {
+        "desc": "PORT_INVALID_DAMPING_HALFLIFE_GT_MAXSUPPRESS_TEST must condition failure.",
+        "eStrKey" : "None",
+        "eStr": ["decay_half_life must be less than or equal to max_suppress_time"]
     }
 
-
-
 }

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

@@ -1013,7 +1013,86 @@
                         "alias": "etp1a",
                         "speed": 100000,
                         "role": "Int"
-
+
+                    }
+                ]
+            }
+        }
+    },
+
+    "PORT_VALID_DAMPING_AIED_TEST": {
+        "sonic-port:sonic-port": {
+            "sonic-port:PORT": {
+                "PORT_LIST": [
+                    {
+                        "name": "Ethernet8",
+                        "alias": "eth8",
+                        "lanes": "65",
+                        "speed": 25000,
+                        "link_event_damping_algorithm": "aied",
+                        "max_suppress_time": 20,
+                        "decay_half_life": 5,
+                        "suppress_threshold": 2000,
+                        "reuse_threshold": 1000,
+                        "flap_penalty": 1000
+                    }
+                ]
+            }
+        }
+    },
+
+    "PORT_VALID_DAMPING_AIED_MONITOR_TEST": {
+        "sonic-port:sonic-port": {
+            "sonic-port:PORT": {
+                "PORT_LIST": [
+                    {
+                        "name": "Ethernet8",
+                        "alias": "eth8",
+                        "lanes": "65",
+                        "speed": 25000,
+                        "link_event_damping_algorithm": "aied-monitor",
+                        "max_suppress_time": 20,
+                        "decay_half_life": 5,
+                        "suppress_threshold": 2000,
+                        "reuse_threshold": 1000,
+                        "flap_penalty": 1000
+                    }
+                ]
+            }
+        }
+    },
+
+    "PORT_INVALID_DAMPING_ALGORITHM_TEST": {
+        "sonic-port:sonic-port": {
+            "sonic-port:PORT": {
+                "PORT_LIST": [
+                    {
+                        "name": "Ethernet8",
+                        "alias": "eth8",
+                        "lanes": "65",
+                        "speed": 25000,
+                        "link_event_damping_algorithm": "invalid_value"
+                    }
+                ]
+            }
+        }
+    },
+
+    "PORT_INVALID_DAMPING_HALFLIFE_GT_MAXSUPPRESS_TEST": {
+        "sonic-port:sonic-port": {
+            "sonic-port:PORT": {
+                "PORT_LIST": [
+                    {
+                        "name": "Ethernet8",
+                        "alias": "eth8",
+                        "lanes": "65",
+                        "speed": 25000,
+                        "link_event_damping_algorithm": "aied",
+                        "max_suppress_time": 10,
+                        "decay_half_life": 15,
+                        "suppress_threshold": 2000,
+                        "reuse_threshold": 1000,
+                        "flap_penalty": 1000
                     }
                 ]
             }

src/sonic-yang-models/yang-models/sonic-port.yang

@@ -243,6 +243,79 @@ module sonic-port{
 					description "Enable or disable fast link-up on the port";
 				}
 
+				leaf link_event_damping_algorithm {
+					description "Link event damping algorithm.
+								 'disabled' - no damping applied to this interface.
+								 'aied' - Additive Increase Exponential Decrease algorithm
+										  based on RFC 2439. Actively suppresses link events
+										  when penalty exceeds suppress threshold.
+								 'aied-monitor' - Same AIED algorithm but monitor-only mode.
+										  Calculates penalties and emits syslog messages but
+										  does NOT suppress link events. Use to safely tune
+										  parameters in production before enabling full
+										  dampening. Recommended by RFC 7196.";
+					type string {
+						pattern "disabled|aied|aied-monitor";
+					}
+					default "disabled";
+				}
+
+				leaf max_suppress_time {
+					description "Maximum time in seconds that an interface can remain
+								 in damped (suppressed) state since the last link-down
+								 event, regardless of accumulated penalty.
+								 A value of 0 means this parameter is not configured.
+								 Industry default: 20 seconds.";
+					type uint32;
+					default 0;
+				}
+
+				leaf decay_half_life {
+					description "Time in seconds after which the accumulated penalty
+								 is halved if the interface remains stable (no flaps).
+								 Must be less than or equal to max_suppress_time.
+								 A value of 0 means this parameter is not configured.
+								 Industry default: 5 seconds.";
+					must "current() = 0 or ../max_suppress_time = 0 or current() <= ../max_suppress_time" {
+						error-message "decay_half_life must be less than or equal to max_suppress_time";
+					}
+					type uint32;
+					default 0;
+				}
+
+				leaf suppress_threshold {
+					description "Penalty threshold above which damping is activated
+								 on the interface. Link events are suppressed when the
+								 accumulated penalty exceeds this value.
+								 A value of 0 means this parameter is not configured.
+								 Industry default: 2000.";
+					type uint32;
+					default 0;
+				}
+
+				leaf reuse_threshold {
+					description "Penalty threshold at or below which damping is
+								 deactivated. The interface returns to normal operation
+								 when penalty decays to this value.
+								 Must be less than or equal to suppress_threshold.
+								 A value of 0 means this parameter is not configured.
+								 Industry default: 1000.";
+					must "current() = 0 or ../suppress_threshold = 0 or current() <= ../suppress_threshold" {
+						error-message "reuse_threshold must be less than or equal to suppress_threshold";
+					}
+					type uint32;
+					default 0;
+				}
+
+				leaf flap_penalty {
+					description "Penalty value added to accumulated penalty for each
+								 link-down (UP to DOWN) transition event.
+								 A value of 0 means this parameter is not configured.
+								 Industry standard: 1000.";
+					type uint32;
+					default 0;
+				}
+
 
 			} /* end of list PORT_LIST */