Bandwidth scaling problem on interface

Hello,

I have trouble with bandwidth monitoring on several interfaces:

The graphs do show traffic that is not even possible due to the link bandwidth.

One Gbps-interface reports:
inbound bw: 49.14 Gbps
outbound bw: 55.55 Gbps

Actually there’s a 100 Mbps link connected to it…

On two other interfaces (also 1 Gbps) i did a “clear counter” yesterday.

The interface reports
Last clearing of “show interface” counters 1d03h
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
6204615 packets input, 866862111 bytes, 0 no buffer
12297671 packets output, 4732526668 bytes, 0 underruns

However, the graph in Libre reports a total traffic of
In: 1.03 TB Out: 14.38 TB

The other reports:
Last clearing of “show interface” counters 1d03h
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
348510031 packets input, 72826789831 bytes, 0 no buffer
440358682 packets output, 134040758280 bytes, 0 underruns

The Graph in Libre however reports:
In: 68.91 TB Out: 58.27 GB

The interface is on a WS-X6748-GE-TX
in a WS-C6509-V-E running 12.2(33)SXI14
and I never trust a CISCO, but how can I debug the issue?

Any help is appreciated.

Thank you!

-awaum

Check here -> https://docs.librenms.org/Support/FAQ/#faq15