Sizing Fabric Interconnect connection
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07-23-2017 09:46 AM - edited 03-01-2019 01:15 PM
Dear everyone,
We are sizing Cisco UCS for our new system. We wonder if there is any recommendation for "uplink : downlink" ratio that we should consideration?
Or more generally, is there any best practice to calculate FI's uplink?
Thanks in advance!
Mountaineer07
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Unified Computing System (UCS)
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07-23-2017 10:08 AM
This document is a good place to start:
Config Guide:
Keep in mind that your vEth interfaces are going to pin to and only utilize the number of uplinks you have between your FI and IOM. So if you have 8 servers and only 1 link between IOM and FI, then that link is split 8 ways. It is also best practice to utilize port-channels between FI and IOM, that way your server interfaces pin to a port-channel rather than an individual link. In the event you lose a link, no re-pinning occurs or disruption to OS, if you had to replace a cable, SFP, etc.
Same scenario going from FI to northbound network. Typically you deploy at least 2-4 Uplink interfaces per FI, but if you are a smaller environment, you may only require 1-2.
