Specifically the number in the RRD filename is the ifIndex.

You may be able to figure it out from the eventlog, but we rely on ifIndex not changing.

Adam.

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On 3 Oct 2019, at 13:06, Mike Stupalov via observium <observium@observium.org> wrote:
Hi,

 that mean you not know Cisco config:

snmp-server ifindex persist

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r7-0/system-management/configuration/guide/b-system-management-cg-asr9000-70x/b-system-management-cg-asr9000-70x_chapter_0101.html#task_3F7075D3DFC34657A2C7E9704E29A209

Laszlo Nemeth via observium wrote on 03/10/2019 15:00:

Hello,

I upgraded our Cisco ASR router, and after the upgrade all of ports graphs cleared, so at this moment i have 4 interfaces with 2 days old graphs. I think port ID or something similar things are changed. So now i have 4 files that not touched in the last 2 days:

port-19.rrd

port-20.rrd

port-21.rrd

port-3.rrd

I think this is the 4 missed graphs. The question is: how can i figure out which rrd means witch interface? From the database or somehow? If i can pair the old rrd and the new rrd i can merge them i think but at this moment i missed the traffic graphs in the last 3 years  :)

Thanks

Laszlo

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Observium Limited, http://observium.org



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