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Help: my BGP session flaps every Tuesday at 3 AM

Networking by Hel 17 replies 2.5K views
Hel

Member OP

Bare Metal Purist

#11

Debian 12, FRR 8.4.4. Emailed DriftNode, waiting. Not migrating yet, their price is fine for the transit mix I need.

ana_mad

Member

#12
Hel said:
Debian 12, FRR 8.4.4

8.4.4 had a bug with hold timers and route-map changes around 2022-2023, but that was patched. Still worth checking if you're on the exact Debian package or their own repo. I saw something similar in Madrid with a client who had FRR from backports and the timer drifted by 30 seconds under load. Not your case probably, but rule it out.

swimming upstream since 2019 🐟
annexbi

Member

#13
Hel said:
Emailed DriftNode

(they will reply) (in 48 hours) (with a template) (that doesn't answer the question) (then you reply) (then they escalate) (then you get the actual window) (this is the way)

push. done. coffee.
hankels

Member

52 VPS and counting

#14
Hel said:
Their price is fine for the transit mix

Fair, their blend is decent. But check Fiberlink's pricing on a second commit, they were running a promo last quarter that beat DriftNode on Cogent-heavy mixes. Not saying switch, just saying know your alternatives before the renewal.

seedbox, NAS, tape, and three offsite
quinnbizz

Member

2 #15

Following. DriftNode did this to us in 2022, window was 2:30-3:30 NZST which maps to roughly that UTC slot. Email went to an old @clear.net.nz address we hadn't used since 2018. Took three tickets to get them to update the primary NOC contact.

...
rudi3

Member

sudo rm -rf /

#16

Actually I would also check if your system clock is synchronized properly. A hold timer expiry can happen if NTP has a jump at 3 AM from a daily cron job, not only from the provider side. Actually check 

timedatectl status
and 
journalctl -u systemd-timesyncd
around the flap time. Actually happened to me in Berlin with a stratum 16 clock after a reboot.

Hel

Member OP

Bare Metal Purist

#17
rudi3 said:
A hold timer expiry can happen if NTP has a jump at 3 AM from a daily cron job, not only from the provider side.

Good call. I have chrony running, logs show no step at that time. Steady offset under 2ms. Ruled out.

ronwit

Member

Budget King

#18
Hel said:
Ruled out

Then it is definitely their window (´・ω・｀) when they reply please update thread so we know for future reference kaomoji waiting

instant noodles, instant deploys

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