[collectd] SNMP woes

[Matt Hite]

Hello!

I'm struggling to derive meaningful metric names out of my collectd
configuration for grabbing CoS statistics from some Juniper switches.

The <Data> definition looks like this:

<Data "jnxCosQstatTailDropPkts">
    Type "cos_dropped"
    Table true
    Values "1.3.6.1.4.1.2636.3.15.4.1.11"
</Data>

The OID is structured like this:

1.3.6.1.4.1.2636.3.15.4.1.11.<snmp_interface_index>.<output-queue-number>

Using the aforementioned Data definition, the metric names end up looking
like this:

cos_dropped-503_0
cos_dropped-503_1
cos_dropped-503_2
cos_dropped-503_3
cos_dropped-503_4
cos_dropped-503_5
cos_dropped-503_6
cos_dropped-503_7
cos_dropped-505_0
cos_dropped-505_1
cos_dropped-505_2
cos_dropped-505_3
cos_dropped-505_4
cos_dropped-505_5
cos_dropped-505_6
cos_dropped-505_7
...
etc.

I tried to insert 'Instance "IF-MIB::ifName"' into the <Data> definition
but that didn't do anything except cause metrics to stop logging. ;)

ifName looks something like this:

ifName.6      = lo0
ifName.35     = vme
ifName.49     = vcp-0
ifName.51     = vcp-1
ifName.503    = ge-0/0/1
ifName.505    = ge-0/0/10
ifName.507    = ge-0/0/11
ifName.509    = ge-0/0/12
ifName.511    = ge-0/0/13
ifName.513    = ge-0/0/14
ifName.515    = ge-0/0/15
ifName.517    = ge-0/0/16
ifName.519    = ge-0/0/17
ifName.521    = ge-0/0/18
ifName.523    = ge-0/0/19
ifName.525    = ge-0/0/2
ifName.527    = ge-0/0/20
ifName.529    = ge-0/0/21
ifName.531    = ge-0/0/22
ifName.533    = ge-0/0/23
ifName.535    = ge-0/0/3
ifName.537    = ge-0/0/4
ifName.539    = ge-0/0/5
ifName.541    = ge-0/0/6
ifName.543    = ge-0/0/7
ifName.545    = ge-0/0/8
ifName.547    = ge-0/0/9
ifName.549    = ge-0/0/0
ifName.551    = vlan
...

You can see the mapping would work quite well if it weren't for the
trailing queue number in the jnxCosQstatTailDropPkts OID.

BTW, the SNMP index number mapping to interfaces can vary across devices
and also between reboots. (This is pretty standard AFAIK.)

Is there any way I could potentially get my metrics logged with names
like...

cos_dropped-ge_0_0_1-0
cos_dropped-ge_0_0_1-1
cos_dropped-ge_0_0_1-2
cos_dropped-ge_0_0_1-3
cos_dropped-ge_0_0_1-4
cos_dropped-ge_0_0_1-5
cos_dropped-ge_0_0_1-6
cos_dropped-ge_0_0_1-7
cos_dropped-ge_0_0_10-0
cos_dropped-ge_0_0_10-1
cos_dropped-ge_0_0_10-2
cos_dropped-ge_0_0_10-3
cos_dropped-ge_0_0_10-4
cos_dropped-ge_0_0_10-5
cos_dropped-ge_0_0_10-6
cos_dropped-ge_0_0_10-7

Specifically, 'cos_dropped' + interface name + output queue number.

Thanks for your help,

-M
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.verplant.org/pipermail/collectd/attachments/20150728/192788ed/attachment-0001.html>