Nexus and QSFP - 4 SFP+ Breakout cables

[NGJ]

Hi

We have Cisco Nexus 93180YC-FX switches. All ports are currently used and additional servers are required to be connected.

Can I make use of the breakout cables that are available.
I.e the switches have 6 x 40/100-Gbps QSFP28 ports.
If I used a QSPF-4x10GB SFP+ breakout cable (QSFP-4SFP10G-CU3M) - is this meant to provide an additional 4 10GB ports that I connect upto servers.
Additionally using a QSFP - 4 x 25GB (QSFP-4SFP25G-CU3M) breakout cables for the same reason.

Thanks

[Reza Sharifi]

Hi,

I.e the switches have 6 x 40/100-Gbps QSFP28 ports

If you are referring to the uplink ports, those 6 can only support 40/100.

HTH

[NGJ]

Hi.  Yes it is the uplink ports I refer to. 

Cisco do sell breakout cables to convert the QSFP ports.  so either 40 gb to 4 x 10gb, and 100gb to 4 x 25gb.  I was wondering if this will be suitable to then connect to servers.  The cables are (in a 3m length for example)

QSFP-4SFP25G-CU3M

QSFP-4SFP10G-CU3M

Thanks

[Reza Sharifi]

Hi,

Have a look at this document:

I don't see the exact model you have here but you may want to try the command. See bold section. "interface breakout module 2"

link:

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/interfaces/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_Interfaces_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_Interfaces_Configuration_Guide_7x_chapter_010....

Cisco Nexus 9000 C93180LC-EX Switch

For 7.0(3)I7(1) and later, Cisco Nexus 9000 C93180LC-EX switch provides three different modes of operation:

• Mode 1: 28 x 40G + 4 x 40G/100G (Default configuration)

  • Hardware profile portmode 4x100g + 28x40g.

  • 10x4 breakout is supported on the top ports from 1 to 27 (ports 1,3,5, 7...27). If any of the top port is broken out, the corresponding bottom port becomes non-operational. For example, if port 1 is broken out port 2 becomes non-operational.

  • 1 Gigabit and 10 Gigabit QSA is supported on ports 29, 30, 31, and 32. However, QSAs on the top and bottom front panel ports must be of same speed.

  • Ports 29, 30, 31, and 32 support 10x4, 25x4, and 50x2 breakout.

• Mode 2: 24 x 40G + 6 x 40G/100G

[NGJ]

Ok I think I can run a 'dynamic breakout 'per port command one the quad sfp+ ports to break out on a per port basis. i.e

interface breakout module 1 port 1 map 10g-4x

I will source one cable to test