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January 6th, 2020 14:00
S5248F-ON / S4148T-ON QSFP28 Port @ 50G Rate
Is it possible to run any of the QSFP28 ports on the S5248F-ON and S4148T-ON switches in 50G mode? The design would be to run a S4128F-ON and put one of the QSFP28 ports into breakout mode (2 x 50G), and then connect to downstream S5248F-ON and S4148T-ON switches using a 100G QSFP28 to 2x50G QSFP28 breakout cable. Would we have to put the downstream S5248F-ON and S4148T-ONs into breakout mode too, even though they're not being broken out, they're just receiving half of a 100G port?
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DELL-Josh Cr
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January 6th, 2020 16:00
Hi,
Yes you can, Page 258 https://topics-cdn.dell.com/pdf/smartfabric-os10-5-0_en-us.pdf
coretelligent
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January 7th, 2020 07:00
Thanks Josh. I saw that, and it makes sense for the S4128F-ON that would have the 100G end of the breakout cable, but just want to confirm that the same would be applicable on the other two? Diagram below:
https://ibb.co/Ldnzyvz
Would we put the two downstream switches into breakout mode, too, or would the ports just auto-sense that they're only getting 50G and set their speed accordingly?
DELL-Josh Cr
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January 7th, 2020 09:00
That should work fine.