I see what you mean on the Aggregate graphs on the MICE Looking
Glass.
http://micelg.usinternet.com/cacti/graph.php?action=view&local_graph_id=2625&rra_id=all
It could be a real member port doing something--but those are
~100 Gbps spikes.
What I also notice is that each spike is followed by a dip of
roughly the same magnitude. This makes me think of sampling
jitter (or artifacts, or noise)
It's hard to describe but port counters don't update every
second, sometimes it's every 30 seconds. Then Cacti comes along
every approx 5 minutes (300 seconds) to poll the counters. The
slight mismatch in timing means that Cacti usually gets 10 counter
updates per 300 seconds--but every hour it gets 11 on one
interval, and 9 on the next.
Overall, the graph is accurate, but it shows this 5% noise every
hour.
This is guesswork in the case of MICE, but I've seen this in
other networks,
Cheers,
Jonathan
Jonathan Stewart
Network Engineer
LES.NET - AS18451
Desk: 1-204-666-6191
Mobile: 1-204-990-2120
130 Portage Avenue E
Winnipeg, MB R3C 0A1
CANADA
On Tue, 2023-12-19 4:27 p.m., Dean
Bahls wrote:
Anyone notice the strange spikes/valleys on
the Cacti graphs lately?
Looks like a heartbeat every hour on the
hour.
Thanks,
Dean
Dean
Bahls
COO |
Fiber Minnesota
14 Main
St SW | PO Box J | Menahga, MN 56464
218.564-1321
(Direct) | 218.564.3000 (Main Office)
dean.bahls@fiberminnesota.com
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