VMware SRM supports 1:1 and N:1 topologies. VMware SRM does not support 1:N and N:N topologies.

1:1 = site-to-site replication with the same hypervisor on both sides (VMware to VMware). This include bi-directional replication support.

N:1 = VMware SRM supports a maximum of 10 paired remote sites. Concurrent recoveries can be run from multiple sites.

1:N, also known as fan-out, is defined as the same protected VM that can be replicated to multiple recovery sites.

N:1, also known as fan-in, is defined as protected VMs in multiple sites being replicated to a single recovery site.