diff --git a/data/grid5000/sites/rennes/network_equipments/gw.json b/data/grid5000/sites/rennes/network_equipments/gw.json
index 3eff5f9a7732e84a571f1e1bef49fda77e40156f..939fd36c1578fe35985cb2743fec9f19e213f404 100644
--- a/data/grid5000/sites/rennes/network_equipments/gw.json
+++ b/data/grid5000/sites/rennes/network_equipments/gw.json
@@ -18,7 +18,7 @@
     },
     "lag3": {
       "kind": "switch",
-      "port": 999,
+      "port": "Ethernet1/999",
       "rate": 50000000000,
       "uid": "mc-fake-sw"
     }
diff --git a/input/grid5000/sites/rennes/networks/gw-rennes.yaml b/input/grid5000/sites/rennes/networks/gw-rennes.yaml
index 76db89798c2a550d2088e305b106ff56062f234a..384f809cc366ce6ea4b031691346fafd40a541e2 100644
--- a/input/grid5000/sites/rennes/networks/gw-rennes.yaml
+++ b/input/grid5000/sites/rennes/networks/gw-rennes.yaml
@@ -122,4 +122,4 @@ gw:
       kind: switch
       rate: 50000000000
       uid: mc-fake-sw
-      port: 999
+      port: Ethernet1/999