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Sorry to late reply.. my issue is RESOLVED... the reason was "I was using APIC controller older version which was only supported by vCenter within VMM Domain, so there was on option of Openstack as a VMM Domain" that's why in my scenario, Controller Node there was a paramters to APIC host... but there was no configuration on APIC side... that's why following impact was there: 1 - APIC was able to show my networks, subnets and security groups which were created in Openstack automatically [The reason was APIC_Mechanisim drivers by defualt they support LLDP] 2 - while my compute-nodes were not able to find any Leaf within the ACI Fabric... [Note: compute are VMS within same UCS... so I used automatic LLDP association with leaves on compute-nodes] just because of half-configuration was between Openstack and APIC host... my VMs instance was not able to find any host....

Now, simply I am using APIC latest version Brazo... which supporting Openstack as VMM Domain.... hope this will be helpfull for any one...

Cheers Ali Murtaza Solangi

Sorry to late reply.. my issue is RESOLVED... the reason was "I was using APIC controller older version which was only supported by vCenter within VMM Domain, so there was on no any option of for Openstack as a VMM Domain" that's why in my scenario, Controller Node there was a were some paramters to APIC host... but there was no configuration on APIC side... that's why following impact was there: 1 - APIC was able to show my networks, subnets and security groups which were created in Openstack automatically [The reason was APIC_Mechanisim drivers by defualt they support LLDP] 2 - while my compute-nodes were not able to find any Leaf within the ACI Fabric... [Note: compute are VMS within same UCS... so I used automatic LLDP association with leaves on compute-nodes] just because of half-configuration was between Openstack and APIC host... my VMs instance was not able to find any host....

Now, simply I am using APIC latest version Brazo... which supporting Openstack as VMM Domain.... hope this will be helpfull for any one...

Cheers Ali Murtaza Solangi