This principal of reserving resources for OAM is also something people should really think about in the network too. Provide some dedicated resources for OAM traffic. I’ve seen too many people be anti-QoS for no real reason (it’s too complicated for them, or surprisingly common is they believe QoS is for “dumb enterprises” or for “legacy telco service providers not us cool new guys”). This includes one very large well known cloud provider that still resisted this even after traffic from multiple DOS events interrupted their monitoring and management access.