Firepower Threat Defence and ARP timeout

[hoffa2000]

Greetings

I have a case where I need to have a lower ARP timeout value than the default 4 hours on one of my FTDs running 6.3.0.3. Under platform Settings there is an ARP timeout that the manual even at 6.4 says is "transparent only" which is not the case for me as I run my FTD routed. However when I set this value to 3600 seconds I get an almost immediate flush of all the older ARP entries suggesting this value also applies to routed FTDs.

It wouldn't be the first time Cisco "neglected to mention" something but I wounder if anyone can offer any insight if I'm seeing a singular occurrence or if this is actually how this feature is supposed to work?

Regards

Fredrik

[Ilkin · Accepted solution]

ARP timeouts should be in effect for routed mode as well. When you set the ARP timeout in Platform Settings, do you see after successfull deployment that all ARP entries on all or some data interfaces are flushed?