fix(router): persist max fallback setting updates

litellm/router.py

@@ -10456,6 +10456,7 @@ class Router:
             "allowed_fails",
             "cooldown_time",
             "num_retries",
+            "max_fallbacks",
             "timeout",
             "max_retries",
             "retry_after",
@@ -10494,6 +10495,7 @@ class Router:
             "allowed_fails",
             "cooldown_time",
             "num_retries",
+            "max_fallbacks",
             "timeout",
             "max_retries",
             "retry_after",
@@ -10510,6 +10512,7 @@ class Router:
         _int_settings: Final = [
             "timeout",
             "num_retries",
+            "max_fallbacks",
             "retry_after",
             "allowed_fails",
             "cooldown_time",

litellm/types/router.py

@@ -117,6 +117,7 @@ class UpdateRouterConfig(BaseModel):
     allowed_fails: int | None = None
     cooldown_time: float | None = None
     num_retries: int | None = None
+    max_fallbacks: int | None = None
     timeout: float | None = None
     max_retries: int | None = None
     retry_after: float | None = None

tests/test_litellm/test_router_retry_policy_update.py

@@ -44,6 +44,13 @@ def test_update_router_config_exposes_retry_policy_field():
     assert "retry_policy" in UpdateRouterConfig.model_fields
 
 
+def test_update_router_config_preserves_max_fallbacks():
+    value = 10
+    config = UpdateRouterConfig(max_fallbacks=value)
+
+    assert config.model_dump(exclude_none=True)["max_fallbacks"] == value
+
+
 def test_update_router_config_accepts_retry_policy_payload():
     """The exact payload the Admin UI Model Retry Settings tab sends must
     round-trip through the schema's ``dict(exclude_none=True)`` form, since
@@ -122,6 +129,14 @@ def test_update_settings_persists_retry_policy_dict():
     assert router.retry_policy.TimeoutErrorRetries == 3
 
 
+def test_update_settings_applies_max_fallbacks():
+    router = _build_router()
+
+    router.update_settings(max_fallbacks=10)
+
+    assert router.max_fallbacks == 10
+
+
 def test_update_settings_accepts_retry_policy_object_unchanged():
     """A pre-built ``RetryPolicy`` instance must pass through verbatim so
     callers that already constructed one (e.g. tests or programmatic