CTIF-EXT-MIB :: ctIfNum

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsCTIF-EXT-MIBctIfNum

ctIfNum

Module: CTIF-EXT-MIB

OID (symbolic): CTIF-EXT-MIB::ctIfNum

OID (numeric): 1.3.6.1.4.1.52.4.3.3.4.1.1.3

Node type: OBJECT-TYPE

Type: INTEGER

Access: read-only

Description: This defines the interface that is being described. This is the same as ifIndex. This is only valid if ctCpFunction is SLIP or PPP, otherwise, 0

What is ctIfNum?

This read-only integer identifies the logical interface (matching ifIndex) associated with a Com Port, but is only meaningful when ctCpFunction is set to slip or ppp; otherwise it reads 0. An admin uses it to find the logical interface a SLIP or PPP-configured serial port maps to. For example, with ctCpFunction set to slip(3) on com2, ctIfNum reports the ifIndex of the SLIP interface running over that serial line.

Examples

Walk all instances (SNMPv2c):

snmpwalk -v2c -c public <target> 1.3.6.1.4.1.52.4.3.3.4.1.1.3
snmpwalk -v2c -c public <target> CTIF-EXT-MIB::ctIfNum

Get a specific instance (index 1):

snmpget -v2c -c public <target> 1.3.6.1.4.1.52.4.3.3.4.1.1.3.1
snmpget -v2c -c public <target> CTIF-EXT-MIB::ctIfNum.1

Start monitoring Cabletron/Enterasys switch/hub (legacy, per-port IF-MIB extension) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the CTIF-EXT-MIB::ctIfNum OID value, configure state conditions and alerts, and monitor any Cabletron/Enterasys switch/hub (legacy, per-port IF-MIB extension) from a single console.

OID Breakdown

Upper-level ancestors (10 from the standard OID tree / other modules)
Numeric OIDNameModule
1isoLANART-AGENT
1.3orgAirPair-MIB
1.3.6dodAirPair-MIB
1.3.6.1internetAirPair-MIB
1.3.6.1.4privateAirPair-MIB
1.3.6.1.4.1enterprisesAirPair-MIB
1.3.6.1.4.1.52cabletronCabletron-MIB
1.3.6.1.4.1.52.4mibsCTRON-AP3000-MIB
1.3.6.1.4.1.52.4.3ctronExtnCTRON-MIB-NAMES
1.3.6.1.4.1.52.4.3.3ctronMib2CTRON-MIB-NAMES
Numeric OIDNameModule
1.3.6.1.4.1.52.4.3.3.4ctIfCpCTIF-EXT-MIB
1.3.6.1.4.1.52.4.3.3.4.1ctCpTableCTIF-EXT-MIB
1.3.6.1.4.1.52.4.3.3.4.1.1ctCpEntryCTIF-EXT-MIB
1.3.6.1.4.1.52.4.3.3.4.1.1.3ctIfNumCTIF-EXT-MIB