Hello,
Long time, first time...
I bought one of these 100G QSFP28 DAC Cable - 100GBASE-CR4 QSFP28 to QSFP28 to connect 2x Mellanox ConnectX-3 Pro ENs (MCX314A-BCCT) with, hoping to get 56Gbps out of them but they only negotiate at 10Gbps.
According to Testing Results: Mellanox ConnectX-3 and achievable link speeds, MCP1600-C003 should negotiate at 56Gbps in Ethernet mode. I also read somewhere on here that QSFP28 DAC is backward compatible with QSFP14 DAC and figured they would just be Plug-n-Play.
Do I need to configure anything on the cards to get 56Gbps? Or anything I can try before returning this cable?
Thank you.
Long time, first time...
I bought one of these 100G QSFP28 DAC Cable - 100GBASE-CR4 QSFP28 to QSFP28 to connect 2x Mellanox ConnectX-3 Pro ENs (MCX314A-BCCT) with, hoping to get 56Gbps out of them but they only negotiate at 10Gbps.
According to Testing Results: Mellanox ConnectX-3 and achievable link speeds, MCP1600-C003 should negotiate at 56Gbps in Ethernet mode. I also read somewhere on here that QSFP28 DAC is backward compatible with QSFP14 DAC and figured they would just be Plug-n-Play.
Do I need to configure anything on the cards to get 56Gbps? Or anything I can try before returning this cable?
Thank you.
Code:
PS C:\Program Files\Mellanox\WinMFT> get-netadapter
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed
---- -------------------- ------- ------ ---------- ---------
SMB-1 Mellanox ConnectX-3 Pro Ethernet Ada... 14 Up E4-1D-2D-12-8B-30 10 Gbps
SMB-2 Mellanox ConnectX-3 Pro Ethernet A...#2 8 Up E4-1D-2D-12-8B-31 40 Gbps
Code:
PS C:\Program Files\Mellanox\WinMFT> mlxfwmanager --query
Querying Mellanox devices firmware ...
Device #2:
----------
Device Type: ConnectX3Pro
Part Number: MCX314A-BCC_Ax
Description: ConnectX-3 Pro EN network interface card; 40GigE; dual-port QSFP; PCIe3.0 x8 8GT/s; RoHS R6
PSID: MT_1090111023
PCI Device Name: mt4103_pci_cr1
Port1 MAC: e41d2d128b30
Port2 MAC: e41d2d128b31
Versions: Current Available
FW 2.42.5000 N/A
PXE 3.4.0752 N/A
Status: No matching image found