----- On Jun 22, 2020, at 11:21 PM, Saku Ytti s...@ytti.fi wrote: Hi Saku,
> On Tue, 23 Jun 2020 at 09:15, Sabri Berisha <sa...@cluecentral.net> wrote: > >> Yeah, except that unless you use static ARP entries, I can't come up >> with a plausible scenario in which this would happen for NTP. Assuming >> we're talking about a non-local NTP server, S3 will not send an NTP >> packet without first sending an ARP. Yes, your ARP will be flooded, >> but your NTP packet won't be transmitted until there is an ARP reply. >> By that time MACs have been learned, and the NTP packet will not be >> considered BUM traffic, right? > > The plausible scenario is the one I explained. The crucial detail is > MAC timeout (catalyst 300s) being shorter than ARP timeout (cisco 4h). > So the device generating the packet knows the MAC address, the L2 does > not. Aaah yes, fair point! Thanks $deity for default timers that make no sense. Thanks, Sabri
