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Beginner

25gb on N9K-C93180LC-EX

I've got a N9K-C93180LC-EX switch. Could I connect a storage that has 25Gbps ports on it? If so, what are my options to connect it; which ports could I use on the switch? Will the switch ports that I connect to provide me 25Gbps speed?

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VIP Advisor

Re: 25gb on N9K-C93180LC-EX

as per model here is the supported ports

 

Up to 32 x 40/50-Gbps QSFP+ ports OR 18 x 100-Gbps QSFP28 ports

 

If you looking FC connection with SAN here is config guide.

 

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/fc-npv/configuration/guide/b-cisco-nexus-9000-nx-os-fcnpv-configuration-guide-93x/b-cisco-nexus-9000-nx-os-fcnpv-configuration-guide-93x_chapter_010.html

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Beginner

Re: 25gb on N9K-C93180LC-EX

Hi Balaji,

This is a IBM V7000 Gen 3 storage with 25Gbps cards on it which are either ROCEv2 or iWARP..

With the switches that I mentioned, the customer currently use them as 40Gbps for host connectivity.

1) If I were to connect it to the 25Gbps storage ports to one of the free ports; do I need to change anything on the switch end or at the port end?

2) Which ports can I use for the 25Gbps; is it the 40Gbps ports that are capable of 50Gbps or the 100Gbps?

3) If I was to connect it to the 40Gbps, I assume they operate at 50Gbps; are they capable to support the 25Gbps and deliver 25Gbps speed to the storage?

4) Finally, does this switch support ROCEv2 or iWARP; if I were to enable NVMe over Ethernet or iSER in the future?

VIP Advisor

Re: 25gb on N9K-C93180LC-EX

Personally I do not believe this support backward compatibility for 25GB.

 

Ports are dual personalities, so you can use for 40/50 or 100GB

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VIP Rising star

Re: 25gb on N9K-C93180LC-EX

the 9300 series does mention 25Gb ports 

but only on selected models see the links for model comparison sheets

 

Table 2.             Cisco Nexus 9300-EX Series Switch Specifications

Feature

Cisco Nexus 93180YC-EX

Cisco Nexus 93108TC-EX

Cisco Nexus 93180LC-EX

Ports

48 x 10/25-Gbps and 6 x 40/100-Gbps QSFP28 ports

48 x 10GBASE-T and 6 x 40/100-Gbps QSFP28 ports

Up to 32 x 40/50-Gbps QSFP+ ports OR 18 x 100-Gbps QSFP28 ports

Downlink supported speeds

1/10/25-Gbps speeds

100-Mbps and 1/10-Gbps speeds

40/50-Gbps speeds

VIP Advisor

Re: 25gb on N9K-C93180LC-EX

hopefully, the original poster do mention the model here i guess - N9K-C93180LC-EX - the answer was based on the model.

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Beginner

Re: 25gb on N9K-C93180LC-EX

Hi Everyone,

Thanks for your response. But, I wanted something validated if it works or not.. For e.g If I was to connect to the 50Gbps ports, will they downgrade to 25Gbps or if I connect to the 100Gbps, will it downgrade to 25Gbps...

Just like we have the FC MDS switches that do support lower speed connections (32Gbps port support 4/8/16Gbps port connections); do these switches support lower speed connections? Can support validate that for me?

VIP Advisor

Re: 25gb on N9K-C93180LC-EX

Hope i have answered already: these are fixed ports and i do not believe they have backward compatibility. 

 

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VIP Rising star

Re: 25gb on N9K-C93180LC-EX

same status from me,

only the 93180YC-EX has 25G capable ports the  N9K-C93180LC-EX does NOT!

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