Nexus 93180YC-EX with FEX 2348TQ

[Garry Cross]

I can't find where it is documented as not supported(doesn't work) to use QSFP-H40G-CUxM DAC cable to connect the FEX to the 9K direct. The AOC cables work fine. The matrix simply states 40G direct is supported.

Regards.

[balaji.bandi]

how far is the FEX? you can try connecting if ths is near to nexus it will give you any indication, nothing harm trying?

I use DAC cable for Fex and nexus it worked, i did not see any document about that for sure. (there may be but cisco documentation is too big).

[Sergiu.Daniluk · Accepted solution]

Hi @Garry Cross 

It is mentioned in the Nexus 2300 Data Sheet, that passive cables are not supported:

https://www.cisco.com/c/en/us/products/collateral/switches/nexus-2000-series-fabric-extenders/datasheet-c78-731663.html

Table 2.           Cisco Nexus 2300 Platform 10 Gigabit Ethernet Fabric Extender Product Specifications

Fabric extender fabric interface type:

●  Fiber: QSFP-40G-SR-BD, QSFP-40G-SR4,QSFP-40G-SR4-S, QSFP-40G-LR4, QSFP-40G-LR4-S, and QSFP-40G-CSR4

●  Copper: 40 Gigabit Ethernet QSFP+ active Twinax cables (QSFP-H40G-ACU7M and QSFP-H40G-ACU10M (no passive cables)

●  AOC cables: QSFP-H40G-AOC1M, QSFP-H40G-AOC2M, QSFP-H40G-AOC3M, QSFP-H40G-AOC5M, QSFP-H40G-AOC7M, QSFP-H40G-AOC10M, and QSFP-H40G-AOC15M

●  AOC breakout cables: QSFP-4X10G-AOC1M, QSFP-4X10G-AOC2M, QSFP-4X10G-AOC3M, QSFP-4X10G-AOC5M, QSFP-4X10G-AOC7M, and QSFP-4X10G-AOC10M

●  Copper breakout cables: QSFP-4x10G-AC7M and QSFP-4x10G-AC10M (no passive cables)

●  Distance between Cisco Nexus 2300 fabric extender and Cisco Nexus 5500 switch is up to 10 km (up to 3 km for FCoE traffic), and for the Cisco Nexus 5600 switch or 6000 Series Switch the distance is up to 3 km (300m for FCoE traffic)

●  All equivalent S-class optics are supported

●  Cisco 40GBASE QSFP to SFP+/SFP adapter (CVR-QSFP-SFP10G)

Hope it helps,

Sergiu

[Garry Cross]

Thank you. Thats what I was looking for.