ASA VDC - is standby address needed?

[dukenuk96]

I have two ASAs 5545-x in Multiple Context, Active/Active failover mode and I do not understand - whether I need to configure standby IP addresses on interfaces inside VDCs which will act as Inside/Outside.

[Philip D'Ath · Accepted solution]

You don't have to - but I always try to.

If you have a standby IP address the ASA can also use it to verify the health of the other ASA.  Otherwise it limits its check to layer 2 checks only.

It is particularly good on management interfaces, as then you can connect to either ASA, active or standby.