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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter12 Starting Interface Configuration (ASA 5510 and Hig her)
Starting Interface Configuration (ASA 5510 and Higher)
member-interface physical_interface2
Where the physical interfaces are any two interfaces of the same type (either formerly in use or unused). You cannot assign a Management interface to a redundant interface.For example, to take advantage of existing cabling, you would continue to use the formerly in-use interfaces in their old roles as part of the inside and outside redundant interfaces:
interface redundant 1
nameif outside
security-level 0
ip address 10.86.194.225 255.255.255.0
member-interface GigabitEthernet0/0
member-interface GigabitEthernet0/2
interface redundant 2
nameif inside
security-level 100
ip address 192.168.1.3 255.255.255.0
member-interface GigabitEthernet0/1
member-interface GigabitEthernet0/3

EtherChannel interface—Enter the following command under each interface you want to add to the

EtherChannel (either formerly in use or unused). You can assign up to 16 interfaces per EtherChannel, although only eight can be active; the others are in a standby state in case of failure.
channel-group channel_id mode active
For example, to take advantage of existing cabling, you would continue to use the formerly in-use interfaces in their old roles as part of the inside and outside EtherChannel interfaces:
interface GigabitEthernet0/0
channel-group 1 mode active
no shutdown
!
interface GigabitEthernet0/1
channel-group 2 mode active
no shutdown
!
interface GigabitEthernet0/2
channel-group 1 mode active
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/3
channel-group 1 mode active
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/4
channel-group 2 mode active
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/5
channel-group 2 mode active
shutdown
no nameif