You can't do this statically by configuring a port to be a member in more than VLAN, but you can use dynamic VLANs (With the VMPS, you can assign switch ports to VLANs dynamically, based on the source Media Access Control (MAC) address of the device connected to the port):
What kind of access are you looking for ? If it's layer 3 access, you should have a device that routes between these 20 Vlans and any access port on any of the Vlans should be able to access all the remaining Vlans via the L3 device.
If it's layer 2 access, you can purchase a NIC (for the intended devices) that support do1tq trunking and configure the switchport as trunk.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.