Interface objects usually define a physical interface associated with a particular machine. Specific protocol characteristics are associated with the interface. By assigning a priority property to the interface, you can specify the order in which the interfaces are evaluated when determining the point-to-point protocol to use for a transfer. Interfaces associated with the responding machine are compared to those of the initiating machine until an interface with a matching point-to-point protocol is found.
Machines may have more than one interface associated with them. The appropriate interface is determined in order of ascending priority, depending on a match for the point-to-point protocol parameter for the initiator and responder machines.
For instance, a priority value of 1 (the highest) indicates that the interface is evaluated first. A value of 0 (the default) indicates an unassigned priority, in which case the interface is evaluated last.
When evaluating interfaces, the interfaces associated with the responding machine are compared to those associated with the initiating machine until an interface with a matching point-to-point protocol is found. So, the responding machine determines the protocol regardless of whether the responding machine is receiving or sending the data. (The responding machine sends the data when the initiating machine pulls it.)
Consider the case where a machine pulls data from another machine. In this scenario, the machine pulling (and receiving) the data is the initiator, while the machine sending the data is the responder. Regardless of data direction, the interfaces associated with the responding machine are evaluated against those of the initiating machine until a matching point-to-point protocol is found.
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