[j-nsp] poll physical GigE and all its VLAN sub-interfaces counters over SNMP with single SNMP GetRequest query

[Martin T]

Saku,

I noticed that while counters in "show interfaces" output are updated
with about 1s interval, then counters asked using SNMP are updated
with 5s interval. Platform is MX series router.
I *think* I am polling IFD. SNMP IfIndex 723 is from "show interfaces
ge-0/0/3" output. I can confirm this with:

$ snmpget -Oq -v 2c -c public 10.10.10.254 ifDescr.723
IF-MIB::ifDescr.723 ge-0/0/3
$

Still, ifInOctets and ifInUcastPkts differ in orders of magnitude from
"Input  bytes" and "Input  packets" counter values in "show interfaces
ge-0/0/3 extensive" output. Any ideas?


regards,
Martin

On Mon, May 5, 2014 at 4:41 PM, Saku Ytti <saku at ytti.fi> wrote:
> On (2014-05-05 18:41 +0300), Martin T wrote:
>
>> poll the ifInOctets and ifInUcastPkts counters for ge-0/0/3(SNMP
>> IfIndex 723) over SNMP:
>>
>> $ for i in 0 1; do snmpget -Oq -v 2c -c public 10.10.10.254
>> 1.3.6.1.2.1.2.2.1.1"$i".723; done
>> IF-MIB::ifInOctets.723 498087262
>> IF-MIB::ifInUcastPkts.723 452255345
>> $
>>
>> ..it appears that VLAN sub-interfaces counters are not included. Is it
>> possible to request GigE and all its VLAN sub-interfaces counters over
>> SNMP with single SNMP GetRequest query? Or is the only option to poll
>> all the sub-interfaces and add the counter values together when using
>> SNMP?
>
> The counters are not updated instantly, there is lag, about 5s or so. On some
> platform might be 30s.
> If you are polling IFD (as opposed to IFL) the IFD counters should include
> aggregate count from all the IFLs.
>
> I would also recommend polling 64b (H) versions of the counters, i.e.
>
> IF-MIB::ifHInOctets.723
> IF-MIB::ifHInUcastPkts.723
>
> --
>   ++ytti
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