It's a simple configuration I've done dozens of times: I create a VLAN, give it an IP address, then configure the laptop with an IP in that range and assign the SFP port to that VLAN and plug the laptop in. The port shows up-up and the VLAN then comes up but I can't ping the laptop from the switch or vice versa, and nothing ever shows up in the mac address table either. It's not the laptop because if I use the management port (Gig 0/0) instead and give it an IP address and configure Gig0/0 as the tftp source-interface, it works. The GLC-T is supposed to be compatible with the switch (a 9500 48YC and a 9500 40X I believe). I am pretty sure I have tried different SFP's of the same type as well with the same result I am new to 9500's and IOS XE 16.11, is there something I've missed / overlooked? Thanks
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Saw a strange issue with a port channel configuration on two stacked (SVL) 3850's.
I suspect someone initially configured the port channel incorrectly, and now I cannot use that same number for a port channel group even if I delete it. I have rebooted the switch and even tried a write erase reload but it fails once I attempt to configure the port channel interface itself (I initially create it by putting two other interfaces into the channel group, then configure that po interface itself) and I get "Standby doesn't support this command". If I use any other number for a new channel group it works
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