To allow IP mobility between Site1 and Site2 in a Cisco ACI Multi-Site orchestrator while meeting the disaster recovery (DR) requirements and avoiding broadcast storms, the following actions should be taken:

Disable Inter-site BUM Traffic: Disabling Broadcast, Unknown unicast, and Multicast (BUM) traffic between sites helps to avoid broadcast storms that can occur when extending Layer 2 domains across multiple sites1.

Apply the L2 Stretch feature: The Layer 2 Stretch feature allows subnets to be extended across multiple sites without the need to re-IP the application servers. This supports IP mobility and enables applications to be started at a DR site using the same IP address space1.

These actions ensure that the design supports a DR solution without requiring vMotion support, allows applications to be started at a DR site without re-IPing servers, and avoids broadcast storms between the sites.

References :=

Cisco ACI Multi-Site Architecture White Paper1

Cisco Nexus Dashboard Orchestrator Overview2