Using Model-Driven Telemetry (MDT) for IF-MIB Data

Data from the IF-MIB

One of the most commonly polled MIBs is the Interfaces MIB (IF-MIB). Pretty much everyone needs to know how many packets and bytes were sent and received on a given interface. So it’s not surprising that one of the first questions we get is how to get the IF-MIB data from MDT.

MDT Configuration for IF-MIB equivalence

As you can see from the table below, most of the interface statistics are in the Cisco-IOS-XR-infra-statsd-oper.yang model, with some state parameters in Cisco-IOS-XR-infra-statsd-oper.yang, and a couple SNMP-specific values in Cisco-IOS-XR-snmp-agent-oper.yang.

Leaving aside the SNMP-specific parameters, here is what the sensor-path configuration in MDT would look like for the IF-MIB:

RP/0/RP0/CPU0:SunC(config)#telemetry model-driven
RP/0/RP0/CPU0:SunC(config-model-driven)#sensor-group SGroup1
RP/0/RP0/CPU0:SunC(config-model-driven-snsr-grp)# sensor-path Cisco-IOS-XR-infra-statsd-oper:infra-statistics/interfaces/interface/latest/generic-counters
RP/0/RP0/CPU0:SunC(config-model-driven-snsr-grp)# sensor-path Cisco-IOS-XR-pfi-im-cmd-oper:interfaces/interface-xr/interface
RP/0/RP0/CPU0:SunC(config-model-driven-snsr-grp)# commit

For the complete MDT configuration, see my configuration tutorial.

With that, you should be streaming all your favorite IF-MIB data at a fraction of the cost of doing an SNMP poll.

OID-YANG Table

Below is a table of the most commonly requested IF-MIB OIDs, their corresponding YANG models, containers, leafs and any usage notes.