Which protocol is used in a Multi-Pod topology to synchronize reachability information across pods?

Multi-Pod in Cisco ACI uses Multiprotocol BGP (MP-BGP) with the Ethernet VPN (EVPN) address family to extend the fabric across multiple physical sites (pods). MP-BGP EVPN is crucial for synchronizing endpoint IP and MAC reachability information, allowing seamless communication and mobility of workloads across different pods.

OSPF is an interior gateway protocol used for routing within an autonomous system and is not designed to synchronize endpoint reachability information across separate ACI pods in a Multi-Pod setup.

IS-IS is a link-state routing protocol similar to OSPF and is not utilized in ACI Multi-Pod for inter-pod endpoint reachability synchronization.

COOP (Council of Oracles Protocol) is an internal ACI control plane protocol used within a single fabric (single pod) to synchronize endpoint information between the leaf and spine switches, not across different pods.