batman: activate bridge loop avoidance

site.conf

@@ -150,6 +150,9 @@
       -- The default class 20 is based on the link quality (TQ) only,
       -- class 1 is calculated from both the TQ and the announced bandwidth
       gw_sel_class = 1,
+      -- Bridge loop avoidance
+      -- reduce the effect of network loops
+      bridge_loop_avoidance = 1,
     },
   },