Incorrect Bandwidth on Juniper MX

[GizmoV]

Dear Manuel!
Thank you for your work!
Forced to turn to you for help, so as to solve the problem for a month I didn't get :(

We have 2 border routers of Juniper MX-series, one MX80 and one MX240.
I tried to configure your scripts with each of them using Netflow v5/v8 and IPFIX and with the same settings got different results, and different from the indications by SNMP.

The results of MX240 like the truth at least 50-70% when the results of MX80 like no more than 20% of truth.
Here is my current sampling settings:

sampling {
sample-once;
input {
rate 100;
max-packets-per-second 65535;
}
family inet {
output {
flow-inactive-timeout 15;
flow-active-timeout 60;
flow-server 192.168.90.100 {
port 9000;
autonomous-system-type origin;
no-local-dump;
source-address 192.168.90.91;
version 5;
}
}
}
}

As I said - using Netflow v5/v8 or IPFIX - gives the same result. And here is graphs compare.

MX240 IP-transit 10G port.

MX240 peering 10G port.

MX80 IP-transit 10G port.

MX80 peering 1G port.

I tried to change various settings of sampling rate as on the router and in your script, and your tips from the next issue: #4

Change $ascache_flush_interval = 10 gave a small positive result is higher-quality graphs, but to solve the problem of incorrect bandwidth I never got.

Asking for your help! I would very much like to use the product and send you a donation.

[JackSlateur]

You are misunderstanding graphs !
On the left, SNMP-based, you've all the data
On the right, the graph show you the data consumed by the 10 "hungrier" ASN.

So, on the right, you have thousands ASN that are not drawn :)

Depending on your kind of data type, you may have a lot of ASN which consumes "almost the same bandwidth", that might explain such graphs.

For information, in my compagny (ISP), on IXP like AMS-IX, the diff is 40%

[GizmoV]

Dear clobrother! I can't fully agree with you :) At least in question with MX80.
Look at the comparison №3 at the junction with the RETN.
If the right really 10 most hungry AS something they can use only 10% of the strip to the left?
Also I forgot to add that MX80, depending on the time of day - almost not falling and increase bandwidth traffic.
Thank you for your help, me in had no idea :) But I think the problem is in something else too.

[bpbp-boop]

this is an old question, but I believe the magic command you're looking for is flex-flow-sizing under the fpc you're using.

reference:
https://www.juniper.net/documentation/us/en/software/junos/flow-monitoring/topics/ref/statement/flex-flow-sizing-edit-chassis.html