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AS9516-32D compatibility with 400G AEC breakout cable

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Guillaume Schreiner

Hello,

I tried to setup breakout ports on the DCS810 AS9516-32D with SONiC.Edgecore-SONiC_20220527_065356_ec202111_bfn_89 . I tried to split one 400GB port to 4x100GB ports. As read on the release notes, the DCS810 AS9516 support the DPB (Dynamic Port Breakout) feature.

In order to bypass some error as seen in other post, I found this workaround instead to doing a factory-reset. I've added this parameter to /etc/sonic/config_db.json

"MGMT_PORT": { "eth0": { "alias": "eth0", "admin_status": "up" } }

 Then reload the config :

 sudo config reload -y

Next I've configured the breakout ports :

sudo config interface breakout Ethernet240 '4x100G[50G]'

sudo config interface startup Ethernet0
sudo config interface startup Ethernet2
sudo config interface startup Ethernet4
sudo config interface startup Ethernet6

However, my breakout cable is not detected with the following command :

show interface transceiver eeprom
The reference of my AEC cable is the Credo 400G (8x56G) QSFP-DD PAM4 to Four 100G (4x28G) QSFP28 NRZ. I have also tried with two different AEC cables. Nothing shows up... Do you know if  this AEC cable is compatible with the DCS810 and with SONIC ?
 
Best Regards,
Guillaume
 
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    Ken Ho

    Hi Guillaume,

    Thanks for your input. We will check it internall and go back to you via ticket soon. 

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    David Hausheer

    Hi Ken and Guillaume,
    Was there a solution to this? I would be interested in AS9516-32D compatibility with breakout cables as well, see my related post here: https://support.edge-core.com/hc/en-us/community/posts/10565997024409-Does-DCS810-work-with-200G-DAC-or-2x200G-breakout-cables-

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    Guillaume Schreiner

    Hi David,

    I finally succeed to setup a working  QSFP-DD 400G to 4x 100GB QSFP cable on the AS9516-32D running latest Edgecore SONIC. I use the "4x100G[50G]" breakout mode. My issue was resolved by updating the BIOS on the other side switch (100GB ports) in order to properly discover and activate the 100GB SFP modules. I also have to setup the same FEC mode (rs) on both side. Despite the fact the interfaces are up inside SONIC (show interfaces status), there's still an open issue about the cable detection detection on AS9516-32D (show interfaces transceiver presence). 

    For your purpose, there's a "2x200G[100G,40G]": breakout mode (show interfaces breakout), but you need a QSFP-DD 400G to 2x QSFP56 200G cable. Theoretically, it should be supported, bu I haven't test this one. 

    Best regards,

     

     

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    David Hausheer
    • Edited

    Hi Guillaume,

    many thanks for your rapid response. Great to hear that you finally got it working. Many thanks for the hint, I am glad to learn that there seems to be a breakout mode for my purpose.
    Indeed, I was considering to purchase a 400G to 2x200G breakout cable. I may just give it a try, since it is also appears here as a solution, just haven't found this explicitly being supported in the DCS810 data sheet.
    Thanks again and best regards,
    David

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