I have a number of routers, all of which behave generally the same wrt SNMP polling under LibreNMS, except one:

 

 

 

As you can see, one ER605 exposes more than twice the port-based metrics.  I have used 'snmpwalk' to verify that it's not something local in the LibreNMS config.  As far as I know this is bog standard, latest firmware, and is controlled by a 5.13 software controller (not that the controller should matter, as there don't seem to be any 'detail' level config options for SNMP in the controller).

 

For instance, most routers display the following type detail for the ports:

 

IF-MIB::ifDescr.1025 = STRING: default/lo

IF-MIB::ifDescr.1026 = STRING: default/eth0

IF-MIB::ifDescr.1027 = STRING: default/eth1

IF-MIB::ifDescr.1028 = STRING: default/tunl0

IF-MIB::ifDescr.1029 = STRING: default/ip6_vti0

IF-MIB::ifDescr.1030 = STRING: default/sit0

IF-MIB::ifDescr.1031 = STRING: default/ip6tnl0

IF-MIB::ifDescr.1032 = STRING: default/gre0

IF-MIB::ifDescr.1033 = STRING: default/gretap0

IF-MIB::ifDescr.1034 = STRING: default/erspan0

IF-MIB::ifDescr.1035 = STRING: default/bond0

IF-MIB::ifDescr.1036 = STRING: default/inf

IF-MIB::ifDescr.1037 = STRING: default/veth0

IF-MIB::ifDescr.1038 = STRING: default/veth1

IF-MIB::ifDescr.1040 = STRING: default/br-lan

IF-MIB::ifDescr.1041 = STRING: default/inf.0

IF-MIB::ifDescr.1043 = STRING: default/inf.1

IF-MIB::ifDescr.1046 = STRING: default/inf.32

IF-MIB::ifDescr.1049 = STRING: default/inf.4093

IF-MIB::ifDescr.1053 = STRING: default/ppp0

 

But my rogue ER605v1 display that plus more

 

IF-MIB::ifDescr.1025 = STRING: default/lo

IF-MIB::ifDescr.1026 = STRING: default/eth0

IF-MIB::ifDescr.1027 = STRING: default/ip6tnl0

IF-MIB::ifDescr.1028 = STRING: default/sit0

IF-MIB::ifDescr.1029 = STRING: default/gre0

IF-MIB::ifDescr.1030 = STRING: default/gretap0

IF-MIB::ifDescr.1031 = STRING: default/bond0

IF-MIB::ifDescr.1032 = STRING: default/veth0

IF-MIB::ifDescr.1034 = STRING: default/eth1

IF-MIB::ifDescr.1040 = STRING: default/eth1.35

IF-MIB::ifDescr.1041 = STRING: default/eth1.4093

IF-MIB::ifDescr.1042 = STRING: default/br-lan

IF-MIB::ifDescr.1043 = STRING: default/pppoe-wan1_poe

IF-MIB::ifDescr.1044 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1045 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1046 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1047 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1048 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1049 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1050 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1051 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1052 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1053 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1054 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1055 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1056 = STRING: default/eth1.40

IF-MIB::ifDescr.1058 = STRING: default/eth1.40

IF-MIB::ifDescr.1059 = STRING: default/eth1.40

IF-MIB::ifDescr.1060 = STRING: default/pppoe-wan2_poe

IF-MIB::ifDescr.1061 = STRING: default/eth1.35

IF-MIB::ifDescr.1064 = STRING: default/eth1.44

IF-MIB::ifDescr.1067 = STRING: default/eth1.40

IF-MIB::ifDescr.1068 = STRING: default/pppoe-wan1_poe

IF-MIB::ifDescr.1069 = STRING: default/eth1.40

IF-MIB::ifDescr.1070 = STRING: default/pppoe-wan1_poe

IF-MIB::ifDescr.1071 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1072 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1073 = STRING: default/pppoe-wan1_poe

IF-MIB::ifDescr.1074 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1075 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1076 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1077 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1078 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1079 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.1080 = STRING: default/lt-lc52240128

IF-MIB::ifDescr.2049 = STRING: vnet/lo

IF-MIB::ifDescr.2050 = STRING: vnet/ip6tnl0

IF-MIB::ifDescr.2051 = STRING: vnet/sit0

IF-MIB::ifDescr.2052 = STRING: vnet/gre0

IF-MIB::ifDescr.2053 = STRING: vnet/gretap0

IF-MIB::ifDescr.2057 = STRING: vnet/veth1

IF-MIB::ifDescr.2059 = STRING: vnet/eth0.1

IF-MIB::ifDescr.2060 = STRING: vnet/eth0.12

IF-MIB::ifDescr.2061 = STRING: vnet/eth0.10

IF-MIB::ifDescr.2062 = STRING: vnet/eth0.11

IF-MIB::ifDescr.2063 = STRING: vnet/eth0.20

 

Why the discrepancy, and if I prefer the second set of data, how do I get all my devices to spit it out?