Posted on September 23, 2015 1:30 pm
 |  Asked by Mikhail Mikhail
 |  769 views
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Hello!

Will the 7500E-36Q work on the DCS-7504 (not E model) with DC-7504-FM?

Have any restrictions in use 7500E-36Q with DCS-7504?

Will 40G ports work with full speed?

Thanks in advance!

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Posted by Jose Reyes
Answered on September 23, 2015 2:10 pm

Hi Mikhail.

Thanks for getting in touch. As per the 7500 Series Q & A document:

”The existing 7500 Series chassis and power supply are unmodified to support the E-Series components”.

Note however that you have to be running at a minimum EOS 4.12, although we recommend getting in touch with your local SE to get a  SW recommendation that fulfills your requirements.

Hope this helps.

Regards,

José Luis Reyes
Systems Engineer LATAM

2
Posted by Lincoln
Answered on September 23, 2015 4:09 pm

See https://www.arista.com/assets/data/pdf/Whitepapers/7500E_Investment_Protection.pdf

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Posted by Roberto Salazar
Answered on September 23, 2015 5:49 pm

Will the 7500E-36Q work on the DCS-7504 (not E model) with DC-7504-FM?  Yes

Have any restrictions in use 7500E-36Q with DCS-7504? Second-generation linecard modules with first-generation fabric modules Mixing second-generation linecard modules with first-generation fabric modules will limit the second-generation linecard modules to the hardware capabilities of the first-generation fabric.

Will 40G ports work with full speed?  Some of these capability limits will be: 1. Fabric links will operate at 6.25 GHz rather than 11.5 GHz (approximately 45% lower fabric capacity) 2. The encoding will be 8b/9 rather than the more efficient 64b/66 (~approximately 9% less efficient) 3. Fabric maximum cell size will be limited to 128 bytes rather than 256 bytes (~5% less efficient) 4. At most 144 active fabric links to a linecard module rather than up to 192 active fabric links on the highest density modules (Up to 25% less performance) 5. Multicast expansion in the fabric will be limited to 16K groups rather than 64K groups Points (1) through (3) mean that the crossbar fabric bandwidth capacity available to second-generation modules on a per-fabric-link basis is approximately half what it would otherwise be with second-generation fabric modules. Point (4) limits the maximum performance on the highest density second-generation linecards. How this converts to real performance depends on the individual modules themselves and the grouping of ports across packet processors and the number of operational fabric links: • DCS-7500E-36Q-LC (36 x QSFP+): o Port groups of 6 x QSFP+ ports (6x40G) per forwarding engine. o Linecard module performance with 6 x first-generation fabrics: ! Any 2 x QSFP+ (80 Gbps) could be used in each port group with N+1 fabric redundancy ! Up to 100 Gbps total bandwidth in each port group with no fabric redundancy (reduced performance on a fabric failure)

 

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Posted by Mikhail Mikhail
Answered on September 30, 2015 8:17 am

Many thanks for Your answers!

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