lacp: add fallback-timeout configuration to aggregate interfaces (#1473)

* lacp: add fallback-timeout configuration to aggregate interfaces

* Update release/models/lacp/openconfig-lacp.yang

Co-authored-by: Darren Loher <dloher@google.com>

---------

Co-authored-by: Aamir Shah <aashah@google.com>
Co-authored-by: Caleb Geiger <48812321+ElodinLaarz@users.noreply.github.com>
Co-authored-by: Darren Loher <dloher@google.com>

Author: 4 people

release/models/lacp/openconfig-lacp.yang

@@ -26,7 +26,14 @@ module openconfig-lacp {
     managing aggregate interfaces.   It works in conjunction with
     the OpenConfig interfaces and aggregate interfaces models.";
 
-  oc-ext:openconfig-version "2.1.0";
+oc-ext:openconfig-version "2.2.0";
+
+revision "2026-04-09" {
+description
+"Add LACP fallback timeout leaf.";
+reference "2.2.0";
+}
+
 
   revision "2024-09-24" {
     description
@@ -422,6 +429,13 @@ grouping aggregation-lacp-members-statistics {
         after the expiry of the timeout period.";
     }
 
+    leaf fallback-timeout {
+      type uint16;
+      units "seconds";
+      description
+        "The timeout in seconds to wait for LACP PDUs before falling back to a single port.";
+    }
+
     uses aggregation-lacp-global-config;
   }