New 2.x Cisco ACI Config Guides:
Cisco APIC Basic Configuration Guide, Release 2.x
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/basic_config/b_APIC_Basic_Config_Guide_2_x.html
Cisco APIC Layer 2 Networking Configuration Guide
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L2_config/b_Cisco_APIC_Layer_2_Configuration_Guide.html
Cisco APIC Layer 3 Networking Configuration Guide
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L3_config/b_Cisco_APIC_Layer_3_Configuration_Guide.html
Configuring vPC from a Host to Fabric Extenders (FEX) in ACI
http://www.cisco.com/c/en/us/support/docs/cloud-systems-management/application-policy-infrastructure-controller-apic/200232-Configuring-vPC-from-a-Host-to-Fabric-Ex.html