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Can a 10G SFP+ transceiver run at 1G on an Aruba 2930 fibre link?

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1

A customer saw errors on a fibre link and suspected a speed mismatch with a 1G far end. The poster asked whether 10G SFP+ transceivers are backward compatible with 1G, or whether the modules had to be swapped for 1G SFPs to talk to the gigabit device on the other side. Hardware involved: Aruba 2930, Aruba 2930F, 10G SFP+, Aruba J4858C, Aruba J4858D.

  • Hardware: Aruba 2930, Aruba 2930F
  • Transceivers: 10G SFP+, Aruba J4858C, Aruba J4858D
  • Form factor: SFP, SFP+

Symptoms / messages:

errors on fibre link
speed mismatch 10G vs 1G
1g 2930 aruba SFP+ speed-mismatch
edge_wolf25 EG

Comments 2

Accepted answer

SFP+ optics run only at 10 Gbps and cannot be down-rated like copper ports; to link at 1G a real 1G SFP such as J4858C (or the newer J4858D) must be used on the 2930.

dwdm_ops44

Supported 1G transceivers were confirmed working in 2930F switches even against media converters on the far end.

lambda_pilot72
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