How to configure subinterfaces on Cisco ASA and mappe each to a vlan for ASA 5510 and higher

In the above topology, we have 2 vlans. How do we configure the ASA's G0/1 interface to support these ?

ASA(config)#interface gig0/1.1
ASA(config-subif)#vlan 10            /*enable trunk on the subinterface g0/1.1 and mappe it to vlan 10 */
ASA(config-subif)#exit
ASA(config)#interface gig0/1.2
ASA(config-subif)#vlan 20         /*enable trunk on the subinterface g0/1.2 and mappe it to vlan 20 */


Configure subinterfaces on Cisco ASA and mappe each to a vlan  for ASA 5505

 If you need to carry multiple VLANs traffic over a link to a neighbring swith :

• create the individual VLANs
  (config)#interface vlan x
• configure  an ASA 5505 physical interface as VLAN trunk link AND allow specific VLANs to be carried over the above specified trunk link (by default no vlans are permitted to be carried over a trunk link)
  (config)#interface "interface-name"
  (config-if)#swithport mode trunk
  (config-if)#switchport trunk allowed vlan x

Let's presume, we have an ASA 5505 connected to a LAN switch using its ethernet0/5 port and our LAN has vlan 10, vlan 20. The following is how we are going to configure the ASA 5505 to supports both vlan traffic on its ethernet0/5 port

(config)#interface vlan 10
(config-if)#exit
(config)#interface vlan 20
(config-if)#exit
(config)#interface ethernet0/5
(config-if)#switchport mode trunk
(config-if)#swichport trunk allowed vlan 10,20



Note that Cisco ASA interfaces or sub-interfaces must be configured with the following to be operational :

• interface name
• ip address and subnet mask
• security level

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