Port-based split horizon is supported on all 7210 SAS platforms as described in this document, except the 7210 SAS-Mxp.
The port-based split horizon feature can be used to disable local switching on the 77210 SAS. A loop-free topology can be achieved using split horizon on 7210 SAS switches.
Traffic arriving on an access or a network port within a split horizon group will not be copied to other access and a network ports in the same split horizon group, but will be copied to an access or network ports in other split horizon groups.
Since split horizon is a per port feature in 7210 SAS, all SAPs associated with the port becomes part of split horizon group configured on that port.