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Mixed Link Aggregation Groups

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  • 1.  Mixed Link Aggregation Groups

    Posted Jul 22, 2019 10:28 PM

    Hi community.

    I have 02 Aruba 8400 in a VSX deployment (let´s call them SWC01-Primary and SWC02-Secondary)
    I also have 01 Aruba 3810M switch (let´s call it SRV-SWITCH) that has an important server connected to it.

    Port A1 on SRV-SWITCH is connected to port 1/9/32 on SWC01-Primary

    SWC01-Primary has lag 40 multi-chassis with port 1/9/32 assigned to it. This port 1/9/32 has a 10GE-SR transceiver installed and working
    SWC02-Secondary has lag 40 multi-chassis with port 1/9/32 assigned to it. This port 1/9/32 has no transceiver installed.
    SRV-SWITCH has a "trk1" lacp group with ports A1 and A2 assigned. Only port A1 has a 10GE-SR transceiver installed and working, A2 has no transceiver installed.

    Configurations on my switches are the following:

    ----------------------------------------------------------------------------------------------
    SWC01-Primary:

     

    SWC01-Primary# sh int transceiver
    ------------------------------------------------------------
    Port Type Product Serial Part
    Number Number Number
    ------------------------------------------------------------
    ...
    1/9/32 SFP+SR J9150D CN93KJW7SD 1990-4635
    ...
    SWC01-Primary# sh running-config
    Current configuration:
    !
    ...
    interface lag 40 multi-chassis
    vsx-sync vlans
    description SRV-SWITCH
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
    lacp mode active
    ...
    interface 1/9/32
    no shutdown
    lag 40
    ...

    ----------------------------------------------------------------------------------------------
    SWC02-Secondary:

     

    SWC02-Secondary# sh int transceiver
    ------------------------------------------------------------
    Port Type Product Serial Part
    Number Number Number
    ------------------------------------------------------------
    ...
    1/9/32 SFP+SR J9150D CN93KJX1SDK 1990-4635
    ...
    SWC02-Secondary# sh running-config
    Current configuration:
    !
    ...
    interface lag 40 multi-chassis
    vsx-sync vlans
    description SRV-SWITCH
    no shutdown
    no routing
    vlan trunk native 1
    vlan trunk allowed all
    lacp mode active
    ...
    interface 1/9/32
    no shutdown
    lag 40
    ...

    -----------------------------------------------------------------------------------------------
    SRV-SWITCH:

     

    SRV-SWITCH# sh running-config

    Running configuration:


    hostname "SRV-SWITCH"
    module 1 type jl074x
    module 2 type jl074y
    flexible-module A type JL083A
    trunk A1-A2 trk1 lacp
    ip route 0.0.0.0 0.0.0.0 192.168.100.1
    ip routing
    ...
    interface A1
    untagged vlan 1
    trunk trk1 lacp
    exit
    interface A2
    untagged vlan 1
    trunk trk1 lacp
    exit
    ...
    SRV-SWITCH> sh int transceiver

    Transceiver Technical Information:

    Product Serial Part
    Port Type Number Number Number
    ------- ----------- ------------ ------------------ ----------
    A1 SFP+SR J9150D CN93KJXJMZ 1990-4635


    -----------------------------------------------------------------------------------------------

     

    For this deployment I want to release the 10GE-SR transceivers that belongs to both ends of the link between SWC01-Primary and SRV-SWITCH for another use, without disrrupting the server installed on the Aruba 3810 named "SRV-SWITCH".
    For this purpose, I want to use a 3m DAC cable (J9283D) and connect it to port A2 in SRV-SWITCH and port 1/9/32 on SWC02-Secondary.
    Questions:
    In this situation, will the interface "lag 40 multi-chassis" bundle port 1/9/32 on SWC01-Primary and port 1/9/32 on SWC02-Secondary to become a 20 Gbps virtual interface?
    In this situation, will the trunk "trk1 lacp" bundle port A1 and A2 on SRV-SWITCH to become a 20 Gbps virtual interface?
    Will a link aggregation group conformed by a 10GE-SR fiber optic link and a DAC cable link work correctly?

    If this works, this will allow me to create a mixed link aggregation group (10GE-SR link + 10GE DAC cable), then replace the original 10GE-SR link with another 3m DAC cable (J9283D), releasing the 10GE-SR transceivers, all without disrrupting the server operation.

    Have anybody deployed this kind of mixed link aggregation group?

     

    Tnaks in advance for your support

     



  • 2.  RE: Mixed Link Aggregation Groups
    Best Answer

    MVP GURU
    Posted Jul 23, 2019 11:13 AM
    It should be OK...one essential requirement for setting up a VSX LAG (or, in general, a LAG) is to use physical interfaces with the same SPEED...so 10Gbps obtained via supported SFP+ Transceivers or obtained via supported DACs should be good enough to let you to have a (VSX/non-VSX) LAG up and connected between your Aruba 8400X VSX nodes and your Aruba 3810M.


  • 3.  RE: Mixed Link Aggregation Groups

    EMPLOYEE
    Posted Jul 24, 2019 03:06 PM

    This is correct. LACP is working above the MAC layer and only cares on speed and duplex. 



  • 4.  RE: Mixed Link Aggregation Groups

    EMPLOYEE
    Posted Aug 21, 2019 05:12 PM

    I used such mix media (same speed) a lot in the past, I saw no issue wih that.