iWAN APIC-EM hub deployment fail

While attempting to deploy the Hub site in APIC-EM, the deployment failed while trying to create the prefix lists.Checked the audit logs, and could see that prefix list creation requested with a number of over 1700 prefixes.Assume it's picking this info up out of the routing table, and that route summarization is a big task. There are over 150 sites with tons of vlans, and being an old network in production for a long while,

This issue is ongoing - can't complete the HUB deployment.

The workaround would be to summarize DC prefixes and routes as much as possible.