I am trying to find the best way to connect two ASA 5515 active/standby firewalls witha L3 Core switch and avoid the use of L2 switches to connect the interfaces and adding possible points of failures.
Attached is a diagram showing my idea of connecting them by using VLANs. (Please note that Vlan_DMZ, VLAN_EXT are not routable).
Please let me know if someone of you implemented this solution vs the use of L2 switches (or Crossover cables).
thank you for your help.