All MIBs › CISCOSB-rlInterfaces › rlIfMapOfOnPhPorts
rlIfMapOfOnPhPorts
Module: CISCOSB-rlInterfaces
OID (symbolic): CISCOSB-rlInterfaces::rlIfMapOfOnPhPorts
OID (numeric): 1.3.6.1.4.1.9.6.1.101.54.3
Node type: OBJECT-TYPE
Type: OCTET STRING
Access: read-only
Description: Each bit in this octet string indicates that the correspondig port's ifOperStatus is ON if set. The mapping of port number to bits in this octet string is as follows: The port with the L2 interface number 1 is mapped to the least significant bit of the 1st octet, the port with L2 ifNumber 2 to the next significant bit in the 1st octet, port 8 to the most-significant bit of the in the 1st octet, port 9 to the least significant bit of the 2nd octet, etc. and in general, port n to bit corresponding to 2**((n mod 8) -1) in byte n/8 + 1
What is rlIfMapOfOnPhPorts?
This read-only OCTET STRING is a bitmap where each bit indicates whether the corresponding port's ifOperStatus is up, with the bit-to-port mapping described explicitly (port 1 to least-significant bit of octet 1, and so on). Admins use it as a compact, single-poll way to get the up/down state of every physical port at once, rather than walking the entire ifTable. For example, a monitoring script could decode this bitmap in one SNMP GET to quickly flag which specific ports on a switch are currently down.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.9.6.1.101.54.3 snmpwalk -v2c -c public <target> CISCOSB-rlInterfaces::rlIfMapOfOnPhPorts
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.9.6.1.101.54.3.1 snmpget -v2c -c public <target> CISCOSB-rlInterfaces::rlIfMapOfOnPhPorts.1
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OID Breakdown
Upper-level ancestors (11 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.9 | cisco | CAT2600-MIB |
| 1.3.6.1.4.1.9.6 | otherEnterprises | CISCO-SMI |
| 1.3.6.1.4.1.9.6.1 | ciscoSB | CISCO-SMI |
| 1.3.6.1.4.1.9.6.1.101 | switch001 | CISCOSB-MIB |
| 1.3.6.1.4.1.9.6.1.101.54 | rlIfInterfaces | CISCOSB-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.9.6.1.101.54.3 | rlIfMapOfOnPhPorts | CISCOSB-rlInterfaces |