Some interesting notes on the latest ACI 2.1.1h firmware.
When configuring two Layer 3 external networks on the same node, the loopbacks need to be configured separately for both Layer 3 networks.
All endpoint groups (EPGs), including application EPGs and Layer 3 external EPGs, require a domain. Interface policy groups must also be associated with an Attach Entity Profile (AEP), and the AEP must be associated with domains. Based on the association of EPGs to domains and of the interface policy groups to domains, the ports and VLANs that the EPG uses are validated. This applies to all EPGs including bridged Layer 2 outside and routed Layer 3 outside EPGs. For more information, see the Cisco Fundamentals Guide and the KB: Creating Domains, Attach Entity Profiles, and VLANs to Deploy an EPG on a Specific Port article.
When creating static paths for application EPGs or Layer 2/Layer 3 outside EPGs, the physical domain is not required. Upgrading without the physical domain will raise a fault on the EPG stating “invalid path configuration.”
When contracts are not associated with an endpoint group, DSCP marking is not supported for a VRF with a vzAny contract. DSCP is sent to a leaf along with the actrl rule, but a vzAny contract does not have an actrl rule. Therefore, the DSCP value cannot be sent.
The Cisco Discovery Protocol (CDP) is not supported in policies that are used on FEX interfaces.