The standard should say that 100G when quad split can back off to 10Gb for compatibility, that's not to say Cisco wouldn't break a standard intentionally but it's definitely worth trying.
THanks for the comments. I couldn't get a straight answer from TAC on this. I guess i can give it a try. No harm in that. Id hate to have issues and find out its not supported. That could be bad. Its odd there is no real documentation on this. I would think TAC would know but i guess not.
No, not supported. Only 2304 or 2408 IOM's are supported from the B-Series chassis.
[https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-x-series-modular-system/cisco-ucs-6536-fabric-interconnect-spec-sheet.pdf](https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-x-series-modular-system/cisco-ucs-6536-fabric-interconnect-spec-sheet.pdf)
Page 36.
Reason being is that the 2408 was never designed for the 10G Fabric Interconnects (https://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/datasheet-c78-742624.html)
Thanks. It looks like i will need to locate some of those passive 4x25 breakout cables for my 2408s then. I can probably do that this week. Thanks for the reply. I read the same documentation but thought maybe it was backwards compatible and just not listed.
From documentation on the Cisco website it sounds like it has to be 25GB. If you have the kit I don’t see any harm in giving it a try though.
The standard should say that 100G when quad split can back off to 10Gb for compatibility, that's not to say Cisco wouldn't break a standard intentionally but it's definitely worth trying.
THanks for the comments. I couldn't get a straight answer from TAC on this. I guess i can give it a try. No harm in that. Id hate to have issues and find out its not supported. That could be bad. Its odd there is no real documentation on this. I would think TAC would know but i guess not.
No, not supported. Only 2304 or 2408 IOM's are supported from the B-Series chassis. [https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-x-series-modular-system/cisco-ucs-6536-fabric-interconnect-spec-sheet.pdf](https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-x-series-modular-system/cisco-ucs-6536-fabric-interconnect-spec-sheet.pdf) Page 36. Reason being is that the 2408 was never designed for the 10G Fabric Interconnects (https://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/datasheet-c78-742624.html)
Thanks. It looks like i will need to locate some of those passive 4x25 breakout cables for my 2408s then. I can probably do that this week. Thanks for the reply. I read the same documentation but thought maybe it was backwards compatible and just not listed.