def is_reserved_binding(binding):
return (binding.instance_id in<EOL>[const.RESERVED_NEXUS_SWITCH_DEVICE_ID_R1])<EOL>
Identifies switch & port operational bindings.

    There are two types of reserved bindings.

    1. The Switch binding purpose is to keep track of the switch state for when
       replay is enabled.  Keeping it in the db, allows for all processes to
       determine known state of each switch.
    2. The reserved port binding is used with baremetal transactions which
       don't rely on host to interface mapping in the ini file.  It is learned
       from the transaction and kept in the data base for further reference.