Stretched HA Firewall

Cisco supports a stretched Active-Standby firewall system if:

• ACI operates in layer 2,
• the firewall operates as the IP default gateway for the endpoints or the firewall operates in Transparent mode or the active and standby nodes are connected with an L3Out.

Independent HA Firewalls

If I have to deploy Active-Standby Firewalls, Cisco recommends to deploy them as independent HA firewalls in the ACI sites (i.e. not across the intersite link)

Technology in Nexus Dashboard Orchestrator	Equivalent on APIC
define a Service Service Device Cluster	L4-7 Device, SGT

EPG-to-EPG PBR contract in ACI multi-site with independent HA-firewalls: I must define the BD subnet also under the consumer EPG and set the no Gateway SVI flag.

Contract Enforcement vs PBR Contract Enforcement vs PBR Policy Enforcement Contract enforcement == zoning rules are deployed to a leaf X. So leaf X takes action on the contract-matched traffic based on the deployed zoning rules. Leaf X is determined according to the Contract Policy Enforcement Locations table in the document ACI Contract Guide White Paper, page=20.