standby ip addresses? are required on all interfaces monitored for failover

Hi all

I need clarification on an interesting question that I observed during the configuration of an active installation / standby to be able to use 2 x 5525 cisco with version 8.6;

Here is the configuration, we have 4 subnets that we need to keep separate. I have each of the ASAs connected to different subnets. However, only 1 subnet's IP address configured standby while all other subnets have only an active address on the active firewall. As this is a failover scenario, I have 2 interfaces for LAN and stateful failover.

I just test the failover on 2 subnets without any standby ip address and to my surprise, everything seems to work as expected. Just need for clarification on why we need sleep on the monitored interfaces addresses when clearly the installer can work without any configured. Are there implications with instance without standby ip addresses?

Thank you

Especially at your facility can happen many things cannot be recognized by the ASA without a correct installation of failover. This could be a port of mafunctioning in your infrastructure for example.

But leave approach it the other way around: what advantages do you see in the implementation in a non-standard way? Or what kind of problems do you expect? Usually the night before IP is not configured if there is no IP address for example on the outside interface.

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Tags: Cisco Security

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