---
oid: "1.3.6.1.4.1.9.5.1.20.2.1.4"
short-description: "portTopNUtilization OBJECT-TYPE"
last-modified: "2018-01-07"
parent-oid: "1.3.6.1.4.1.9.5.1.20.2.1"
---

## OID: `1.3.6.1.4.1.9.5.1.20.2.1.4`

```asn1
{iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) 9 workgroup(5) ciscoStackMIB(1) portTopNGrp(20) portTopNTable(2) portTopNEntry(1) portTopNUtilization(4)}
```

### Description

```asn1
portTopNUtilization OBJECT-TYPE
SYNTAX INTEGER(1..65535)
MAX-ACCESS read-only
STATUS current
DESCRIPTION "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."
```

**Classification:** MIB object for network management

### Child OIDs

No child OID

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