portTopNUtilization

The utilization of the port in the system.
The utilization is computed in the following
methods:
              
Ethernet Utilization: (If Full Duplex, multiply by 2)
              
10 Mbps         I/O-pkts * (9.6 + 6.4) + (0.8 * I/O-Bytes)
Ethernet Util = -----------------------------------------
        Interval * 10,000
              
        where 9.6 is interframe gap of Ethernet
        6.4 is preamble of Ethernet
        10,000 is 10Mbps
              
100 Mbps        I/O-pkts * (96 + 64) + (8 * I/O-Bytes)
Ethernet Util = --------------------------------------
        Interval * 1,000,000
              
1000 Mbps       I/O-pkts * (96 + 64) + (8 * I/O-Bytes)
Ethernet Util = --------------------------------------
        Interval * 10,000,000
              
All other       I/O-pkts * (9.6 + 6.4) + (0.8 * I/O-Bytes)
Ethernet Util = ------------------------------------------
        Interval * N * 1,000
        (where N is N Mbps)
              
Token Ring Utilization:
(Assuming that Octets is from AC byte through FCS)
              
              
4 Mbps                  Pkts * 32 + (8 * Octets)
Token Ring Util = 100 * ------------------------
                Interval * 4,000,000
           where 32 is bits in SD, ED, FS and IFG
              
16 Mbps                 Pkts * 64 + (8 * Octets)
Token Ring Util = 100 * ------------------------
                Interval * 16,000,000
          where 64 is bits in SD, ED, FS and IFG
              
FDDI Utilization:
              
   I/O-Pkts * (64 + 8 + 32 + 16) + (8 * I/O-Bytes)
FDDI Util = ----------------------------------------------
   Interval * 100,000,000
              
   where 64 is Preamble of FDDI,
   8 is the Start Delimiter (SD) of FDDI,
   32 is the CRC, and
   16 is the End of Frame Sequence (EFS) of FDDI.

MIB

CISCO-STACK-MIB

OID

.1.3.6.1.4.1.9.5.1.20.2.1.4

Type

column

Access

readonly

Status

current

Parent

portTopNEntry

Groups

2