Latency for C9500-16X

[Taandav21]

Hello,

Does anyone have any idea about the latency on C9500-16X? Datasheet doesn't have the latency information. Thank you. 

Best,

TT

[Reza Sharifi]

Hi,

Can you elaborate what you meant by "latency"?

Here is some info on the architecture:

Cisco Catalyst® 9500 Series Switches are the foundation of the Cisco®
next-generation, enterprise-class backbone solutions. These switches are
industry’s first purpose-built, fixed 1-rack-unit (RU) core and aggregation
layer switches targeted for the enterprise campus. These switches deliver
exceptional table scales (MAC, route, and access control list [ACL]) and
buffering capabilities for enterprise applications. This platform delivers up
to 6.4 Terabits per second (Tbps) of switching capacity and up to 2 billion
packets per second (Bpps) of forwarding performance. The platform offers
non-blocking 100-Gigabit-Ethernet Quad Small Form-factor Pluggable
28 (QSFP28) and 40-Gigabit-Ethernet Quad Small Form-factor Pluggable
(QSFP+) as well as 25-Gigabit-Ethernet Small Form-factor Pluggable 28
(SFP28) and 10/1-Gigabit-Ethernet Small Form-factor Pluggable (SFP+/SFP)
switches with granular port densities that meet diverse campus needs.
This white paper provides an architectural overview of the new Cisco Catalyst
9500 series, including system design, power, cooling, and storage options.  

HTH

[Taandav21]

I

[Joseph W. Doherty]

I'm unable to find that documented too but it appears a modern high performance switch's latency is typically a few microseconds to ten or so. "Slow" switches might take up to fifty microseconds while "fast" switches might be sub-microsecond.

If I'm reading the C9500 datasheet correctly it also supports cut-though switching, which if active can be a latency reducer especially if jumbo frames are being used.

[Taandav21]

Thanks for your responses, guys. I replied last night through an email but, somehow, it didnt get posted. Anywho, in our case, latency is the time takes to switch a frame from one port to another on the same switch. As Joseph mentioned, nowadays, in the data center Low latency switches, they are in microseconds. Some platforms claim to have reduced them to one microsecond for the frames of certain size. However, in case of Catalyst switches they are a little on a higher side. I am comparing a few switches and latency is an important factor. I will keep on looking for it. If I find something, will come back and update the post. 

Thanks,

TT

[gbekmezi-DD]

This may help you:

https://miercom.com/pdf/reports/180711I.pdf

[Joseph W. Doherty]

Interesting that the minimum frame size shown in that report is 192.