As a follow up I managed to chase down someone with a spare 40Gb cable and that resolved the issue, so apparently the brand new cable was bad. Now to figure out who to yell at for a new one
We recently got a brand new M1000e with dual MXL switches in it, after cancelling the bare metal provisioning all I did was attempt to stack the two on the built in 40gb ports by using the "stack-unit 0 stack-group 0" and "stack-unit 0 stack-group 1" commands, saving and reloading both switches and connecting the ports with 40gb cables as directed in the guides online. However, every minute or sometimes more I get the following and i'm not sure where to look. I've already tried a wipe and factory reset several times, perhaps it's a hardware issue? Apr 30 10:58:37: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 1/37Apr 30 10:58:37: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/37Apr 30 10:59:11: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 1/37Apr 30 10:59:11: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/37Apr 30 11:00:51: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 1/37Apr 30 11:00:51: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/37Apr 30 11:01:51: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 1/37Apr 30 11:01:51: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/37Apr 30 11:01:58: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 1/37Apr 30 11:01:58: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/37Apr 30 11:02:25: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 1/37Apr 30 11:02:25: %MXL-10/40GbE:1 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 1/37
New MXL pair, one stack port flapping