diff --git a/data/grid5000/sites/reims/network_equipments/gw-reims.json b/data/grid5000/sites/reims/network_equipments/gw-reims.json
index 53fcedb209e4e6ea4f302df2dd02bcdb34d1fb03..839b0ab044b6cce6814975e081e6d3485b008193 100644
--- a/data/grid5000/sites/reims/network_equipments/gw-reims.json
+++ b/data/grid5000/sites/reims/network_equipments/gw-reims.json
@@ -165,6 +165,7 @@
     }
   ],
   "model": "Cisco C3560E-48TD-S",
+  "mtu": 9198,
   "routes": {
 
   },
diff --git a/generators/input/sites/reims/net-links/gw-reims.yaml b/generators/input/sites/reims/net-links/gw-reims.yaml
index 40c6da62bff0d3fbca1c1874c4806dab8af9c7ff..dbbdb084db2013441912f67c5f9f1e5e53a78579 100644
--- a/generators/input/sites/reims/net-links/gw-reims.yaml
+++ b/generators/input/sites/reims/net-links/gw-reims.yaml
@@ -11,7 +11,8 @@ gw-reims:
       addresses:
         - 172.16.175.254
   routes: {}
-  backplane_bps: 128000000000,
+  backplane_bps: 128000000000
+  mtu: 9198
   linecards:
     0:
       naming_pattern: Gi%LINECARD%/%PORT%