# Cisco ASA 5525 Cluster Active/Passive
**URL:** https://forum.networklessons.com/t/cisco-asa-5525-cluster-active-passive/8360
**Category:** ASA
**Created:** [September 27, 2019, 4:51am UTC](https://forum.networklessons.com/t/cisco-asa-5525-cluster-active-passive/8360 "2019-09-27T04:51:12Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@nprasad](https://forum.networklessons.com/u/nprasad)
#### Post date: [September 27, 2019, 4:51am UTC](https://forum.networklessons.com/t/cisco-asa-5525-cluster-active-passive/8360/1 "2019-09-27T04:51:12Z")
Can we have an existing ASA 5525 (or any ASA Firewall) with a running configuration on it, and then introduce the failover configuration at a later stage along-with the standby unit ? This is off-course assuming that the second firewall is of the same model and IOS version etc.
I am looking to cluster a standalone firewall by introducing a second unit and am not sure if the above approach is feasible on an already configured and existing ASA ?
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### Author:  [@lagapidis](https://forum.networklessons.com/u/lagapidis)
#### Post date: [October 1, 2019, 6:00am UTC](https://forum.networklessons.com/t/cisco-asa-5525-cluster-active-passive/8360/2 "2019-10-01T06:00:14Z")
A post was merged into an existing topic: [Cisco ASA Firewall Active / Standby Failover](https://forum.networklessons.com/t/cisco-asa-firewall-active-standby-failover/838)
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### Author:  [@lagapidis](https://forum.networklessons.com/u/lagapidis)
#### Post date: [October 1, 2019, 6:00am UTC](https://forum.networklessons.com/t/cisco-asa-5525-cluster-active-passive/8360/3 "2019-10-01T06:00:14Z")