setup sub interfaces on cisco ASA

This is the real interface basically it has no config

interface GigabitEthernet0/1
 speed 1000
 duplex full
 no nameif
 no security-level
 no ip address

Sub interface 20 (we use the same number as the VLAN)
interface GigabitEthernet0/1.20
 vlan 20    
 nameif LAN
 security-level 100
 ip address 10.20.1.1 255.255.255.0 standby 10.20.1.2

Sub interface 25
interface GigabitEthernet0/1.25
 vlan 25
 nameif DMZ
 security-level 50
 ip address 10.25.8.1 255.255.255.0 standby 10.25.8.2
!

Create and apply some basic ACLs
access-list LAN extended deny ip any any log
access-list LAN line 1 extended permit icmp any any log
access-group LAN in interface LAN

access-list DMZ extended deny ip any any log
access-list DMZ line 1 extended permit icmp any any log
access-group DMZ in interface DMZ

We need to attach a trunk port to Gig0/1. It must carry the VLANs 20 and 25. This config will be done on the switch.