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Howto: 50Gb tri-speed transceivers

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  • 1.  Howto: 50Gb tri-speed transceivers

    Posted Sep 30, 2023 10:49 AM

    Howto: 50Gb tri-speed transceivers

    Overview

    HPE Aruba Networking recently released a major new firmware upgrade for CX switches with CX 10.12. One of the interesting new features is that the standard 50Gb multimode transceiver has been enabled with tri-speed mode. That's right, if you already have a R0M48A 50Gb transceiver, when you use it in switch with CX 10.12, you can run at 10, 25 or 50Gb speeds!

    I will show how to do an upgrade from 10 to 25 to 50Gb with minimal downtime in this post. 

    R0M48A Transceiver slide


     

    Scenario

    This could be useful in scenarios such as:

    • You upgrade core/aggregation switches first (eg with the CX 8360, CX 6400 models with 50Gb ports) but still need to connect to the 10Gb downstream access switches: put in 50Gb optics and run them at 10Gb until  you can upgrade the access switches
    • Conversely, the access switches have been replaced with CX6300, and you want to run 25 or 50Gb uplinks, but the upstream core/agg devices only have 10 or 25Gb ports still: include 50Gb optics in the 6300 access switches and run them at the lower speed until  you can upgrade the core/agg switches

    Example Step Upgrade Process

    Environment

    • 2 x 6300 24 port switches
    • The upper switch is 6300-aggregation
    • The lower switch is 6300-access
    • Both switches have a pair of SFP56 ports configured as an LACP LAG (1/1/27 & 1/1/28)

    In the starting configuration, the aggregation switch has an LACP LAG group running over a pair of 50Gb tri-speed transceivers configured to run at 10Gb, connected to the access switch with a pair of 10Gb transceivers.

    Aggregation Switch Config

    interface lag 1
        description Downstream Lag
        no shutdown
        no routing
        vlan trunk native 930
        vlan trunk allowed all
        lacp mode active
        lacp fallback-static
        lacp rate fast
        exit
    interface 1/1/27
        no shutdown
        speed auto 10g
            ! actual speed 10g
        lag 1
        exit
    interface 1/1/28
        no shutdown
        speed auto 10g
            ! actual speed 10g
        lag 1
        exit

    Access Switch Config

    interface lag 1
        description Uplink-Lag
        no shutdown
        no routing
        vlan trunk native 930
        vlan trunk allowed all
        dhcpv4-snooping trust
        lacp mode active
        lacp rate fast
        exit
    interface 1/1/27
        no shutdown
        lag 1
        exit
    interface 1/1/28
        no shutdown
        lag 1
        exit

    Central, MultiEdit and LACP

    • If you are managing these switches with Central, it is best to use MultiEdit to make these changes.
    • Using the Central GUI may be challenging because you can't modify LAG member speed individually.
    • You can use the CLI too, but note that after release 2.5.9, Central will overwrite changes made in support mode, so you will have to complete the whole task in less time that it takes Central to identify the changes and change them back.
    • It is also important to have a loop avoidance mechanism in place. I have MSTP (basic settings as provided by the Central GUI).
      Remember that speeds cannot be mixed in a LAG - all members must be the same speed, so you cannot add a 25Gb member to a 10Gb LAG.

    Upgrade from 10Gb to 25Gb

    1. On agg switch, edit config for first port (1/1/27): shutdown; speed auto 25g
    2. On access switch, swap in 25Gb transceiver first port (1/1/27)
      At this stage, the LAG will be active on one link only at 10Gb still
       
    3. On agg switch, edit config to re-enable first port (1/1/27): no shutdown
      & edit config for second port (1/1/28): shutdown; speed auto 25g; remove from lag
      There will be some disruption here as the LAG changes from 10 to 25Gb; I usually see about 18 x 1s pings dropped.
      LAG is now up with single 25Gb member
    4. On access switch, swap in 25Gb transceiver to second port (1/1/28)
    5. On agg switch, edit config for second port (1/1/28): no shutdown; lag 1
      Now there is a LAG with 2 x 25Gb members.

       

    Next step is 25 to 50Gb

    The process is essentially the same again.

    1. On agg switch, edit config for first port (1/1/27): shutdown; remove speed setting (default is 50Gb)
    2. On access switch, swap in 50Gb transceiver first port (1/1/27)
    3. On agg switch, edit config to re-enable first port (1/1/27): no shutdown
      & edit config for second port (1/1/28): shutdown; remove speed; remove from lag
      There will be some disruption here as the LAG changes from 25 to 50Gb; I usually see about 18 x 1s pings dropped.
      LAG is now up with single 50Gb member
    4. On access switch, swap in 50Gb transceiver to second port (1/1/28)
    5. On agg switch, edit config for second port (1/1/28): no shutdown; lag 1
      Now there is a LAG with 2 x 50Gb members.

       


    Q&A

    Q: What speeds does the tri-speed R0M48A transceiver support?
    A: 10, 25 or 50Gb

    Q: Will the tri-speed R0M48A run in any port?
    A: It will run only in SFP56 ports. These are found in the 6300, 6400, 8360 series of CX switches. IRIS can help you configure the correct transceivers for  switches, along with the Transceiver Guide.
    The output below is from a CX 6200 switch - it only has 10Gb SFP+ ports (not SFP56 like the 6300), and the 50Gb transceiver is specifically flagged as incompatible.

    6200F-12# sh int 1/1/15 transceiver
    ------------------------------------------------------------------------------
    Port           Type             Product          Serial           Part
                                    Number           Number           Number
    ------------------------------------------------------------------------------
    1/1/15         50G-SR           R0M48A           MYxxxxxxxx       1990-4803
    
    6200F-12# sh int 1/1/15 transceiver detail
    Transceiver in 1/1/15
     Interface Name      : 1/1/15
     Type                : 50G-SR / 50G SFP56 SR
     Connector Type      : LC
     Transceiver Status  : An HPE pluggable module that is incompatible with this interface
     Wavelength          : 850nm
     Transfer Distance   : 0.00km (SMF), 0m (OM1), 0m (OM2), 70m (OM3)
     Diagnostic Support  : None
     Product Number      : R0M48A
     Serial Number       : MYxxxxxxxx
     Part Number         : 1990-4803

    Q: Is the tri-speed R0M48A auto-sensing?
    A: No, it defaults to 50Gb, so you must specify 10 or 25Gb.

    References

    https://asp.arubanetworks.com/downloads;search=transceiver;sort=RELEASEDATE_DESC;fileTypes=DOCUMENT;products=Aruba%20Switches
    AOS-Switch and AOS-CX Transceiver Guide

    https://community.arubanetworks.com/viewdocument/aos-cx-1012-software-release-ente
    AOS-CX 10.12 Training Materials



    ------------------------------
    Richard Litchfield
    Airheads MVP 2020, 2021, 2022
    ------------------------------



  • 2.  RE: Howto: 50Gb tri-speed transceivers

    Posted Oct 03, 2023 04:01 AM

    From the Datasheet: DS_6300Series.pdf,:

    • (note 1). 50G capability is for use with 50G DACs for both interconnect and VSF stacking

    Is this not the case anymore ?



    ------------------------------
    Steinar
    ------------------------------



  • 3.  RE: Howto: 50Gb tri-speed transceivers

    Posted Oct 03, 2023 08:30 AM

    DACs are still supported, and make most sense for stacking within a rack or cabinet.

    6300 stacked with DACs

    The 50Gb transceivers are useful for high-speed uplinks, but you could also use them for stacking: this could be useful when the switches are separated by a distance longer than a DAC supports.



    ------------------------------
    Richard Litchfield
    Airheads MVP 2020, 2021, 2022
    ------------------------------



  • 4.  RE: Howto: 50Gb tri-speed transceivers

    Posted Nov 17, 2023 02:08 AM

    Hi There,

    just found this interesting info.

    Does it mean, with CX 10.12+ and R0M48A i could connect server using 50G? 

    BR
    Marcus




  • 5.  RE: Howto: 50Gb tri-speed transceivers

    Posted Dec 08, 2023 07:08 AM

    If the server has a 50Gb SFP56 port, you would be able to use a 50Gb optic (and maybe DAC) to connect that to a CX switch.



    ------------------------------
    Richard Litchfield
    Airheads MVP 2020, 2021, 2022
    ------------------------------



  • 6.  RE: Howto: 50Gb tri-speed transceivers

    Posted Dec 08, 2023 07:23 AM

    I am now successfully running a 50Gbs, fiber transceiver pair between a 6300 and 8365. However the 8365 will utilize only 2 physical port in a 4 quadrant position, meaning the aggregated utilization for those 4 port will be at 100Gbs maximum speed, which add up to the same as 4 25 Gbs, but for an exponential cost... (If number of fiber links is not an issue, [2 or 4])



    ------------------------------
    Steinar
    ------------------------------