Maintenance window: from Aug 28 00:00 -> 06:00 CEST (UTC+2 ==> 22:00 UTC Aug 27 -> 04:00 UTC Aug 28)
"Before the planned works, we ask you to make sure that the lasers are disabled, for the safety of our technicians working on the optical fiber connection(s)."
https://groups.google.com/a/wikimedia.org/d/msg/ops-maintenance/vEs6fPW04ms/aU7HT5XPFQAJ
That seems to actually be one circuit terminating in two ports on each sides:
cr2-knams:xe-0/0/3 to asw-esams:xe-0/0/32
As we have two other fibers it's fine to disable them before the maintenance and no do any routing changes.
Mentioned in SAL (#wikimedia-operations) [2019-08-27T21:11:06Z] <XioNoX> disable both sides of the reline link between knams and esams - T230448
Mentioned in SAL (#wikimedia-operations) [2019-08-28T17:42:49Z] <XioNoX> re-enable both sides of the reline link between knams and esams - T230448