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AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

  • 1.  AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

    Posted Sep 06, 2019 08:29 AM

    Overview

    The (newish) 8325 switch has SFP28 ports that support 1, 10, 25Gb connections. These are organised into interface groups of 12 ports each, and the default speed setting is 25Gb. You may not find the command to change it by looking around the CLI, hence this post.

     

    Group speed mismatch Error

    The flashing orange port light or this error is likely to be first indication you have that the port is not configured to support 1 or 10Gb transceivers.

     

    8325 group speed mismatch.jpg

     

     

    8325# sh int brief
    ----------------------------------------------------------------------------------
    Port      Native  Mode   Type        Enabled Status  Reason                 Speed
              VLAN                                                              (Mb/s)
    ----------------------------------------------------------------------------------
    1/1/1     --      routed --          no      down    No XCVR installed      --
    1/1/2     --      routed --          no      down    No XCVR installed      --
    1/1/3     --      routed SFP+DA3     no      down    Group speed mismatch   --
    1/1/4     --      routed --          no      down    No XCVR installed      --
    1/1/5     --      routed --          no      down    No XCVR installed      --
    1/1/6     --      routed --          no      down    No XCVR installed      --
    1/1/7     --      routed --          no      down    No XCVR installed      --
    1/1/8     --      routed --          no      down    No XCVR installed      --
    1/1/9     --      routed --          no      down    No XCVR installed      --
    1/1/10    --      routed --          no      down    No XCVR installed      --
    1/1/11    --      routed --          no      down    No XCVR installed      --
    1/1/12    --      routed --          no      down    No XCVR installed      --
    1/1/13    --      routed 1000BT      no      down    Group speed mismatch   --
    1/1/14    --      routed --          no      down    No XCVR installed      --
    1/1/15    --      routed --          no      down    No XCVR installed      --
    1/1/16    --      routed --          no      down    No XCVR installed      --

    In this example, there is a 10Gb DAC in 1/1/3, and a 1Gb RJ45 transceiver in 1/1/13 that are mismatched.

     

    Standard commands do not show anything, and there are no pointers in the running config.

     

    8325# sh int 1/1/3
    
    Interface 1/1/3 is down (Administratively down)
     Admin state is down
     State information: Group speed mismatch
     Description:
     Hardware: Ethernet, MAC Address: 54:80:28:fc:86:00
     MTU 1500
     Type SFP+DA3
     qos trust none
     Speed 0 Mb/s
     Auto-Negotiation is on
     Flow-control: off
     Error-control: off
     Rx
                 0 input packets               0 bytes
                 0 input error                 0 dropped
                 0 CRC/FCS
     Tx
                 0 output packets              0 bytes
                 0 input error                 0 dropped
                 0 collision
    
    8325# sh run int 1/1/3
    [nothing at all in a default config]

    Interface Group

    We need to look specifically at the interface-group.

     

    8325# sh system interface-group
    ------------------------------------------------
    Group  Speed  Member Ports      Mismatched Ports
    ------------------------------------------------
    1      25g    1/1/1-1/1/12      1/1/3
    2      25g    1/1/13-1/1/24     1/1/13
    3      25g    1/1/25-1/1/36
    4      25g    1/1/37-1/1/48

     

    8325 Interface groups.png

     

     

    We need to change the config to 10g (which also supports 1Gb).

     

    8325(config)# system interface-group 1 speed 10g
    Changing the group speed will disable all member interfaces that
    do not match the new speed.
    
    Continue (y/n)? y
    8325(config)# system interface-group 2 speed 10g
    Changing the group speed will disable all member interfaces that
    do not match the new speed.
    
    Continue (y/n)? y
    8325(config)# system interface-group 3 speed 10g
    Changing the group speed will disable all member interfaces that
    do not match the new speed.
    
    Continue (y/n)? y
    8325(config)# system interface-group 4 speed 10g
    Changing the group speed will disable all member interfaces that
    do not match the new speed.
    
    Continue (y/n)? y

    Working!

    It now works OK.

     

    8325(config)# sh int brief
    ----------------------------------------------------------------------------------
    Port      Native  Mode   Type        Enabled Status  Reason                 Speed
              VLAN                                                              (Mb/s)
    ----------------------------------------------------------------------------------
    1/1/1     --      routed --          no      down    No XCVR installed      --
    1/1/2     --      routed --          no      down    No XCVR installed      --
    1/1/3     --      routed SFP+DA3     no      down    Administratively down  --
    1/1/4     --      routed --          no      down    No XCVR installed      --
    1/1/5     --      routed --          no      down    No XCVR installed      --
    1/1/6     --      routed --          no      down    No XCVR installed      --
    1/1/7     --      routed --          no      down    No XCVR installed      --
    1/1/8     --      routed --          no      down    No XCVR installed      --
    1/1/9     --      routed --          no      down    No XCVR installed      --
    1/1/10    --      routed --          no      down    No XCVR installed      --
    1/1/11    --      routed --          no      down    No XCVR installed      --
    1/1/12    --      routed --          no      down    No XCVR installed      --
    1/1/13    --      routed 1000BT      no      down    Administratively down  --
    1/1/14    --      routed --          no      down    No XCVR installed      --
    1/1/15    --      routed --          no      down    No XCVR installed      --
    1/1/16    --      routed --          no      down    No XCVR installed      --

     

    And you can also see the commands in the config.

     

    8325# sh run
    Current configuration:
    !
    !Version ArubaOS-CX GL.10.03.0030
    !
    !
    !
    ssh server vrf mgmt
    !
    !
    !
    !
    !
    vlan 1
    spanning-tree config-name 54:80:28:fc:86:00
    interface mgmt
        no shutdown
        ip dhcp
    ! interface group 1 contains ports 1/1/1-1/1/12
    system interface-group 1 speed 10g
    ! interface group 2 contains ports 1/1/13-1/1/24
    system interface-group 2 speed 10g
    ! interface group 3 contains ports 1/1/25-1/1/36
    system interface-group 3 speed 10g
    ! interface group 4 contains ports 1/1/37-1/1/48
    system interface-group 4 speed 10g
    interface 1/1/3
    interface 1/1/55
       no shutdown

    1Gb Optical Transceivers

    There is an additional setting for 1Gb optical transceivers to force them to 1000-full. In fact this is the only parameter for "speed".

    speed 1000-full

     



  • 2.  RE: AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

    Posted Sep 06, 2019 10:45 AM

    Greetings! great article!

     

    Worth to add just a little note (IIRC): SFP Transceivers (Optical/Copper) are supported on Aruba 8325 starting from the ArubaOS-CX 10.03 CPE release (10.03.0001).



  • 3.  RE: AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

    Posted Sep 09, 2019 04:42 AM

    Thans Richard !!!



  • 4.  RE: AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

    Posted Feb 18, 2020 03:19 PM

     

    Thanks for this post.

     

    I lose 12 Ports just for the keepalive link (which is a 1G SFP LR Transceiver).

     

    Not nice.



  • 5.  RE: AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

    Posted Feb 19, 2020 04:21 AM

    Hello, 

    Regarding the dedicated port for keepalive. This is a recommendation for simplification and robustness, not a must. If you prefer to have keepalive transiting over upstream L3 network, this is possible under some restrictions: uplinks should not be VSX LAGS.

    Please read the VSX Best Practice Appendix D

    https://support.hpe.com/hpsc/doc/public/display?docId=a00094242en_us

     

    This is explained in details.