Just purchased a Dell S5232F-ON 100G switch for BeeGFS-ing our GPU servers. I wanted to connect the S5232F-ON (S5K) to our existing S4048-ON (S4K) switch stack using the fastest connection possible which Dell said was using 40G Twinax DAC cable. Both switches have the latest firmware version.
The S4K switch is not set to quadport mode and I've tried setting the S5K to use breakout map 40g-1x and feature auto-breakout which basically does the same. Either way, both switches say "port up, line protocol down". On both switches, it correctly detects the DAC cable (from Dell) and will even show its serial number. I've also tried another known good DAC cable.
This is with a minimal configuration, no lag, no VLAN etc. LLDP does not show anything.
Looking at the logs, there are no errors, it doesn't appear to have been shutdown by Spanning Tree etc.
With the same minimal configuration, connecting both switches using 10G MM SR SFP+ work fine and it shows up in LLDP.
I've already sent the show tec to Pro Support and it's baffled them.
Any ideas?
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