Systemd/networkd: Difference between revisions

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        };
      };
+  };
+</syntaxhighlight>
+=== Bridge ===
+Given multiple interfaces, that are connected into a bridge will act like a common switch and forward Ethernet frames between all connected bridge ports. The Linux bridge supports various features, like spanning tree, bridge port isolation or acting like a multicast router.
+The configuration on top of the bridge interface depends on the desired functionality, e.g., configuring an IP address would make the bridge host reachable on the Ethernet segment.
+Recommended documentation:
+* [https://www.freedesktop.org/software/systemd/man/systemd.network.html#%5BBridge%5D%20Section%20Options <nowiki>[Bridge]</nowiki> configuration reference]
+<syntaxhighlight lang="nix">
+  systemd.network = {
+    netdevs = {
+       # Create the bridge interface
+       "20-br0" = {
+         netdevConfig = {
+           Kind = "bridge";
+           Name = "br0";
+         };
+       };
+    };
+    networks = {
+      # Connect the bridge ports into the bridge
+      "30-enp1s0" = {
+        matchConfig.Name = "enp1s0";
+        networkConfig.Bridge = "br0";
+        linkConfig.RequiredForOnline = "enslaved";
+      };
+      "30-enp2s0" = {
+        matchConfig.Name = "enp2s0";
+        networkConfig.Bridge = "br0";
+        linkConfig.RequiredForOnline = "enslaved";
+      };
+      "40-br0" = {
+        matchConfig.Name ="br0";
+        bridgeConfig = {};
+        linkConfig = {
+          # or "routable" with IP addresses configured
+          RequiredForOnline = "carrier";
+      };
+    };
+  };
 </syntaxhighlight>