ASA - Redundant Interfaces


  • Configuration

ciscoasa(config)# interface redundant 1

Interface number can be from 1 to 8

ciscoasa(config-if)# member-interface Ethernet 0/0
INFO: security-level and IP address are cleared on Ethernet0/0.

We added Ethernet0/0 as a member interface of Interface Redundant 1

ciscoasa(config-if)# member-interface Ethernet 0/1
INFO: security-level and IP address are cleared on Ethernet0/1.

We added Ethernet0/1 as a member interface of Interface Redundant 1

  • Choose which interface is active

By default active interface is first on the list, also mac address is from first interface is used.

In case of failover mac addressed is used by second interface.It is possible to configure different mac-address for redundant interface but I think in 99% of cases it is useless.


(config)# show interface redundant 1 detail

asa-redundant-1.PNGIf you wish to change active member to Ethernet0/1 type command:

# redundant-interface Redundant 1 active-member ethernet 0/1


 In this articles I will use Ethernet0/0 as a active interface


  •  Configure network settings
We do in similar way like in normal configuration, the only difference is we use Interface Redundant X name instead of Interface ethernet X

ciscoasa(config-if)# ip add
ciscoasa(config-if)# ip address x1.223.184.147

ciscoasa(config-if)# no shu

ciscoasa(config-if)# nameif outside
INFO: Security level for "outside" set to 0 by default.

ciscoasa(config-if)# exit

  • Enable physical interfaces(members of Redundant interface)

ciscoasa(config)# interface ethernet 0/0
ciscoasa(config-if)# no shut
ciscoasa(config-if)# exit


ciscoasa(config)# interface ethernet 0/1
ciscoasa(config-if)# no shut
ciscoasa(config-if)# exit

  •  Configure routing/gateway if needed.
  • Display stats for redundant interface and configuration


Test configuration


ciscoasa(config)# ping
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/28/30 ms

 We did test via Redundant interface to google dns.


 dzbanek 2013-05-17

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