diff --git a/backend/src/utilities/bridge_link_state_manager.py b/backend/src/utilities/bridge_link_state_manager.py
index 89dfc66..07d92b1 100644
--- a/backend/src/utilities/bridge_link_state_manager.py
+++ b/backend/src/utilities/bridge_link_state_manager.py
@@ -438,12 +438,7 @@ class BridgeLinkStateWatcher:
         if state.mtu is not None:
             return True
 
-        profile = state.ethernet_profile
-        if profile is None:
-            return False
-        if profile.autoneg is True:
-            return True
-        return profile.autoneg is False and profile.speed_mbps is not None and profile.duplex is not None
+        return self._partial_profile_is_usable(state.ethernet_profile)
 
     def _has_config_mismatch(self, source_ifname: str, states: dict[str, MemberLinkState]) -> bool:
         """Return whether any sibling differs from the chosen source configuration."""
@@ -625,9 +620,9 @@ class BridgeLinkStateWatcher:
         """Return whether a profile contains enough data to drive synchronization."""
         if profile is None:
             return False
-        if profile.autoneg is True:
-            return True
-        return profile.autoneg is False and profile.speed_mbps is not None and profile.duplex is not None
+        if profile.autoneg is None:
+            return False
+        return profile.speed_mbps is not None and profile.duplex is not None
 
     def _materialize_profile(
         self,
@@ -708,37 +703,36 @@ class BridgeLinkStateWatcher:
         target_profile = target.ethernet_profile
         if source_profile is None or target_profile is None or source_profile == target_profile:
             return None
+        if not self._partial_profile_is_usable(source_profile):
+            return None
         if not self._should_attempt_sync(source_ifname, target_ifname, source_profile):
             return None
 
         change_summary: Optional[str] = None
         commands: list[tuple[list[str], str]] = []
         if source_profile.autoneg is True:
-            if source_profile.speed_mbps is not None and source_profile.duplex is not None:
-                # A remote peer can pull this port down to a lower negotiated speed while autoneg
-                # stays enabled locally. Mirror that effective mode while keeping autoneg enabled
-                # on the sibling so its far-end peer can still negotiate successfully.
-                commands.append(
+            # A remote peer can pull this port down to a lower negotiated speed while autoneg
+            # stays enabled locally. Mirror that effective mode while keeping autoneg enabled
+            # on the sibling so its far-end peer can still negotiate successfully.
+            commands.append(
+                (
+                    [
+                        _ETHTOOL_BIN,
+                        "-s",
+                        target_ifname,
+                        "speed",
+                        str(source_profile.speed_mbps),
+                        "duplex",
+                        source_profile.duplex,
+                        "autoneg",
+                        "on",
+                    ],
                     (
-                        [
-                            _ETHTOOL_BIN,
-                            "-s",
-                            target_ifname,
-                            "speed",
-                            str(source_profile.speed_mbps),
-                            "duplex",
-                            source_profile.duplex,
-                            "autoneg",
-                            "on",
-                        ],
-                        (
-                            f"{target_ifname} link={source_profile.speed_mbps}Mb/"
-                            f"{source_profile.duplex}/autoneg-on"
-                        ),
-                    )
+                        f"{target_ifname} link={source_profile.speed_mbps}Mb/"
+                        f"{source_profile.duplex}/autoneg-on"
+                    ),
                 )
-            else:
-                commands.append(([_ETHTOOL_BIN, "-s", target_ifname, "autoneg", "on"], f"{target_ifname} link=autoneg-on"))
+            )
         elif source_profile.autoneg is False and source_profile.speed_mbps is not None and source_profile.duplex is not None:
             # Do not force autoneg off on sibling ports. The far-end peer on that segment may
             # still rely on autoneg, and forcing a fixed mode here can leave the link down.