diff --git a/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.html b/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.html
index 6dee9bc7..b4df3214 100644
--- a/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.html
+++ b/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.html
@@ -53,6 +53,7 @@
             <input
               matInput
               type="number"
+              min="0"
               [(ngModel)]="destinationPort"
               formControlName="destinationPort"
               placeholder="Port"
@@ -62,6 +63,7 @@
             <input
               matInput
               type="number"
+              min="1"
               [(ngModel)]="destinationDlci"
               formControlName="destinationDlci"
               placeholder="DLCI"
diff --git a/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.ts b/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.ts
index 6dec7841..0d0200e3 100644
--- a/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.ts
+++ b/src/app/components/project-map/node-editors/configurator/switch/configurator-switch.component.ts
@@ -90,9 +90,9 @@ export class ConfiguratorDialogSwitchComponent implements OnInit {
 
   clearUserInput() {
     this.sourcePort = '0';
-    this.sourceDlci = '0';
+    this.sourceDlci = '1';
     this.destinationPort = '0';
-    this.destinationDlci = '0';
+    this.destinationDlci = '1';
   }
 
   strMapToObj(strMap) {