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Re: MAC Flaps - Always bad or sometimes normal?

by in Switching
‎Dec 23 2021 9:49 AM
1 Kudo
‎Dec 23 2021 9:49 AM
1 Kudo
We have noticed a lot of this on our network and have determined it is because we refurb a lot of PC laptops/tablets and Macbooks. Anymore a lot of them don't have an RJ45 port, so we use USB to RJ45 adapters, and that's what's causing our flapping because these adapters don't stay in place, they get moved from station to station during the day ... View more

Re: Slow DHCP between Meraki MS250 => Cisco SG220 => Macbook(s)

by in Switching
‎Aug 11 2020 10:14 AM
1 Kudo
‎Aug 11 2020 10:14 AM
1 Kudo
Hey thanks everybody, didn't mean to drop out on ya but I had a little unexpected Covid break and I'm back on it and I believe I have it solved! Big extra thanks to @cmr and @PhilipDAth for the clues I needed. Hooking the MacBook up directly to the Meraki MS250 did result in getting an IP address almost instantly, no interim self-assigned address. I should have read Philip's response a little more closely as I went off in my own direction researching the SG220s which led me to the Port Fast setting you referenced, although in the SG220 this is referred to as Edge Port, at least in the GUI I changed the port setting to Edge Port for a couple of the ports, connected the MacBook and Boom! 4 seconds to an IP address, even with these clunky USB to Ethernet adapters   Obvious in hindsight but it turns out this wasn't a problem with the Macs at all. I had noticed that the SG220s were slow to pick up an IP address as well, but I didn't connect the dots On Cloud 9, this has been a thorn for several months. Wondering if I can pull a Costanza and leave work early on a high note   ... View more

[SOLVED] Slow DHCP between Meraki MS250 => Cisco SG220 => Macbook(s)

by in Switching
‎Jun 18 2020 9:52 AM
‎Jun 18 2020 9:52 AM
Hello: I'm serving DHCP from an MS250 layer 3 interface down through a Cisco SG220 switch and ultimately to some Macbooks. If I've got a Windows machine connected it picks up the DHCP info fairly quickly but the Macs are very slow to pick up the DHCP and usually self-assign an IP address before eventually obtaining an IP address from the Meraki Does anybody have any tips/ideas to speed DHCP up for the MacBooks, especially perhaps in the settings for the Cisco SG220? I'm sure some of it is on the Mac side, especially if I'm using a USB to RJ45 adapter. A thunderbolt to RJ45 adapter, or if I've got an older MacBook that actually has a network port will get better results but will still self-assign an IP address before getting one via DHCP On the layer 3 interface I have no boot options set, and multicast routing is disabled The port on the Meraki is set to Trunk, with RSTP enabled and Trusted Mode not enabled On the Cisco SG220 I can ping the layer 3 interface with no problem, not really sure what else I should be looking at Any tips appreciated, or if you can point me in the direction of what I should be researching that works too, thanks much! ... View more
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