CeDiagPortList
The entPhysicalTable contains conceptual rows representing ports, each having a value that uniquely identifies the port relative to its parent physical entity (example: the value of entPhysicalParentRelPos or external labeling of port). This MIB definition assumes that these values are relatively small integers. An OCTET STRING representing a list of ports, in which each bit represents a single port. The bits in the first octet represent ports identified by the integer values 1 through 8, inclusive, The bits in the second octet represent ports identified by the integer values 9 through 16, inclusive, and so forth. Within each octet, the most significant bit of an octet represents the port identified by the lowest integer value, and the least significant bit represents the port identified by the highest integer value. The figure shown below illustrates the format of a port list 8 octets in length. Octet 1 Octet 32 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ | |...| | +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +- Port 255 | | | | | | | | | | | | | | +--- Port 254 | | | | | | | | | | | | | +----- Port 253 | | | | | | | | | | | | +------- Port 252 | | | | | | | | | | | +--------- Port 251 | | | | | | | | | | +----------- Port 250 | | | | | | | | | +------------- Port 249 | | | | | | | | +--------------- Port 248 | | | | | | | | : | | | | | | | | : | | | | | | | +--------------------- Port 7 | | | | | | +----------------------- Port 6 | | | | | +------------------------- Port 5 | | | | +--------------------------- Port 4 | | | +----------------------------- Port 3 | | +------------------------------- Port 2 | +--------------------------------- Port 1 +----------------------------------- Port 0 An port list of length N, where N < 32, represents a port list for which ports assigned identifiers greater than or equal to N*8 have the value of '0'. A special case is a port list having a length of '0', which represents the empty set (i.e., no ports). Observe that care should be taken to concerning the numbering of ports relative to their parent physical entity. Some implementations base their numbering at '0' and others base their numbering at '1'. To avert any problems introduced by such inconsistencies, the management application should pay attention to the contents of the entPhysicalTable when constructing a port list.