Hi,I would like to check if we use 40G QSFP+, can it work with storage server that is using 25G QSFP28? Can the transceiver go down the speed to 25G?
No, 25Gbps is not supported yet.
No, the 40G Transceivers used in the 8400/8320 are single speed only.
If used in another QSFP+ or QSFP28 port, only if that QSFP28 port is designed to also support 40G speeds will the 40G Xcvrs work.
The 8400 100G QSFP28 ports on the JL366A Aruba 8400X 6p 40G/100G QSFP28 Adv Module can operate with a 40G Aruba Xcvr inserted (JH231A, JH232A, JH233A, JL308A and the 40G DACs JH234A, JH235A, JH236A).
See the "ArubaOS-Switch and ArubaOS-CX Transceiver Guide" for more details and compatibility information. (make sure the guide you're looking at has "ArubaOS-CX" in the title -- the latest edition as of July, 2018 is Edition 4.
Thank you, I would go for the 59xx series then for compatibility with 25G.
Hello all, just for reference - as of today July, 17th 2018 May, 2019 - the latest ArubaOS-Switch and ArubaOS-CX Transceiver Guide available on HPE Support Portal is this one of March, 28th 2018 (edition 4) January, 9th 2019 (edition 6).
Edit: the link's target document were updated by Aruba which changed Edition 4-->6, I updated the reference.
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