sdn-switch.markdown

@@ -33,4 +33,23 @@ From the administrator-mode you can enter the __configure-mode__ where you can s
 tbd
 
 ### configure mode
-tbd
+
+#### Set allowed VLANs on a switch port
+1. Change to configure mode.
+```
+> enable
+# configure
+```
+2. Define the VLANs
+```
+(config) vlan 1200-1710
+```
+3. For each port add allowed VLANs (e.g. 0/25)
+```
+(config) interface gigabitethernet 0/25
+[ (config-if) show ]
+(config-if) switchport trunk allowed vlan add 1200-1710
+(config-if) write
+[ (config-if) top ]
+```
+