Specifies the index of a port or a slot for traffic limitation. It uniquely identifies a port or a slot. The value and algorithm are the same as those of ifIndex. If the configuration based on a slot, the bits map is shown as follows: | 31-25 bits | 24-19 bits | 18-13 bits | 12-6 bits | 5-0 bits is reserved | | indicate iftype | indicate frame ID | indicate slot ID | indicate port ID | | | the value of iftype | frame ID | slot ID | the value of port ID | the reserved value | | is always 0x68 | | | is always 0 | is always 0 | Range: 0-4294967295