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Can't get Mellanox ConnectX-4 CX455A to work at 100Gbps on CRS504-4XQ-IN

Tue May 16, 2023 3:16 pm

Hi everybody!

Issue:
As per subject I can't get the 100Gbps speed to work using a proper 100Gbps card on the CRS504.

Scenario:
CRS504-4XQ-IN with default script (all interfaces bridged), running RoS 7.9, using XQ+DA0001 DAC cables to hook up the servers.

Got a working link by disabling Auto Negotiation on the qsfp28-x-1interfaces: works fine at 40Gbps, can't get it to 100Gbps on ConnectX-4 (looses link but ethtool still finds out that is a DAC cable), details:
- Mellanox ConnectX-3 CX314A 10/40Gbps QSFP+ --> Working by setting qsfp28-x-1 speed to 40Gbps full duplex
- Mellanox ConnectX-4 CX455A 40/100Gbps QSFP28 --> Working by setting qsfp28-x-1 speed to 40Gbps full duplex, fails to get link when set to 100Gbps.

any suggestions on what to look for? SFP FEC Mode? Other?

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