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Virtual Connect FlexFabric and 10Gb SR SFP+ transceivers

Trusted Contributor

Virtual Connect FlexFabric and 10Gb SR SFP+ transceivers

Taha had a transceiver question:




Hi All,


Can someone please let me know if the 10Gb SR SFP+ (455883-B21) connected to a Cisco 1GB SFP will  auto-negotiate down to 1Gb?


Customer currently has 1Gb SFP’s on his Cisco switch and he will be upgrading to 10Gb down the line. He wants to know if the 10Gb SR SFP+ on VC FlexFabric will be able to auto-negotiate down to 1Gb if 10Gb SFP+’s are installed in ports X5-X8?




Jeroen informed Taha:




No, the Virtual Connect SR SFP+’s will only run on 10GB and will not auto-negotiate down to 1GB.

You have to use then the 1GB RJ45 or SX SFP modules that are in the VC quickspecs.




Remember that the transceivers are very much tied to bandwidth:

SFP is for 1Gb optical transmission

SFP+ is for 10Gb optical transmission.

And you need to have like or matching styles on both ends tomake things work. ie. SFP to SFP, SFP+ to SFP+