Extra interfaces on SNMP

Morning all,

I have something that I haven't seen before and can't figure out.

We have recently built a new Zabbix template to show if the interfaces descriptions are correct for our environment. In doing so we are getting alarms for interfaces on Cisco boxes that don't exist.

For example I have a 1921/K9 running Version 15.0(1r)M16 which on an SNMPwalk shows interfaces gi0/0, gi0/1 and gi0/2. However the box doesn't have a gi0/2! It has got an expansion card (0/0/0 - 3) which is polling correctly.

The output of the SNMPwalk is;[root@name ~]# snmpwalk -v 2c -c "community" "IP address" 1.3.6.1.2.1.2.2.1.2

IF-MIB::ifDescr.1 = STRING: Embedded-Service-Engine0/0

IF-MIB::ifDescr.2 = STRING: GigabitEthernet0/0

IF-MIB::ifDescr.3 = STRING: GigabitEthernet0/1

IF-MIB::ifDescr.4 = STRING: GigabitEthernet0/2 <------------- The box doesn't have this interface.

Has anyone seen this before? I can't see anything online about it, my first thought is that it's a bug in iOS as only a few devices are doing it and all the other vendors we have in the network are fine.

Thanks in advance.