I have a Cisco ASA5510, IOS 7.2.5
Presently it is connected to a single Cisco 2960 with VLAN's 10,11,12, configured as subinterfaces on E0/1, which are also the internal default gateways for the respective VLANs. So the ASA routes between the VLAN's - (LAN, DMZ etc)
Our parent company has sent 2 x 2960G switches (not stackable) as a switch replacement.
What is the best method of connecting these switches to the ASA? I would like to decommission the old 2960 and just use the new gigabit switches. I need to use the same VLAN's on both switches.
Don't know if it is best to have a single trunk link to ASA5510 to sw1, then LACP port-channel from SW1 to SW2 -- I realise this is daisy chaining, so would be least preferable.
ASA/E0 - SW1/Gi0/1 - trunk with subinterfaces as is now?
ASA/E1 - SW2/Gi0/1 - trunk with subinterfaces?
SW1 - SW2 - LACP ?? or would that cause spanning tree loops?
I am willing to accept any other suggestions for configuration.
Hopefully I don't need to upgrade to IOS 8.4 on ASA, really would like to avoid those headaches for the moment