Posted on January 16, 2019 11:13 pm
 |  Asked by William Coats
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We have ordered 100G blade for our 7508. We are going to breakout the 100G ports into 2 ports. I know we could break the ports out to 4x10G or 2x25G. Can they be broken out into other configurations such as 2x10G plus 2x25G? I want to make sure I group the ports correctly.

Answered on January 16, 2019 11:54 pm

Assuming we’re talking about the DCS-7500R-36CQ-LC, each of the 36 ports can operate as either 1 x 100G or breakout to 2 x 50G or 4 x 25G when populated with a 100G QSFP transceiver. If populated with a QSFP+ transceiver, each port can operate as either 1 x 40G or breakout to 4 x 10G. All port speed configuration changes are hitless and no ports are disabled or unavailable.

Note that you cannot have variable speeds on a single physical port. For given port, if broken out, will run at 4×10 if 40G-QSFP+ breakout option is used. Or if 100G-QSFP transceiver is used you can configure it at 2 x 50 or 4 x 25. You cannot mix speeds on a single port.

Please see this reference:

Posted by Farouk Hirji Hirji
Answered on January 16, 2019 11:59 pm


Can you provide details on specific linecard you ordered?

Generally, 100G interfaces on 7500R linecards are QSFP100. They can be broken down into 4x10G, 4x25G, or 2x50G. You can break the 100G into 2x25G plus 2x10G.

Please refer to the following 100G cabling guide :

Best Regards


Correction – You can NOT mix speeds on breakout of a 100G interface.

Sorry for the confusion. I missed a word in my response.

(Farouk Hirji Hirji at January 17, 2019 2:17 am)

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