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  • 1.  LACP Cisco iOS/VOSS interconnection best practices

    Posted 11-12-2021 08:46
    Hi,

    Looking for creating an LACP interconnection between a SMLT VOSS Cluster and a VSS Cisco Catalyst Cluster, I wish to know best practices in terms of spanning tree and SLPP. What is the best to setup in a such case ?

    Rodjeur


  • 2.  RE: LACP Cisco iOS/VOSS interconnection best practices
    Best Answer

    Posted 11-29-2021 09:24
    Hi Rodjeur, thanks for reaching out. We don't have specific best practice for this per se, as using SMLT results in STP being disabled on the SMLT side.  SLPP is our recommended loop prevention and protection methodology for SMLT environments, and our best practices there involve using different rx-thresholds on the SMLT links to avoid taking both down if the loop is over the SMLT itself (eg 50 one side, 500 on the second link).  The specific values used for rx-threshold should be tuned based on deployment specifics, such as the number of VLANs transmitting SLPP packets on the links. For the CISCO side of this, not having STP on the SMLT links needs to be factored into the overall loop design for that portion of the network. Hope that helps!


  • 3.  RE: LACP Cisco iOS/VOSS interconnection best practices

    Posted 11-30-2021 02:14
    Hi Rodjeur,

    From my feedback, to configure interconnexion between VOSS and other vendor device, i always use LACP (MLT or SMLT). 
    If it's not required, i always disable spanning-tree on MLT/SMLT. And especially with other vendors, to avoid STP compatibility issue.  
    SLPP is a good way to check SMLT static link agregation, i use it too. 
    With LACP, some says that as LACP check the agregation and it's not needed. That's true, but SLPP add another protection. 

    Regards, 
    Théo 




  • 4.  RE: LACP Cisco iOS/VOSS interconnection best practices

    Posted 11-30-2021 03:35
    Hi guys,

    Thanks for your advice. I've already disabled STP on VOSS side and enabled SLPP with assymetric values for rx-threshold. If I will understood, I should to disable STP on Cisco side too ?

    Rodjeur


  • 5.  RE: LACP Cisco iOS/VOSS interconnection best practices

    Posted 11-30-2021 04:03
    Hi Rodjeur, 

    Yes, STP should be disabled on both side.
    If STP is enabled, it can extend time during failover. 

    Regards, 
    Théo


  • 6.  RE: LACP Cisco iOS/VOSS interconnection best practices

    Posted 11-30-2021 04:07
    Ok, I will do that.

    Regards,

    Rodjeur


  • 7.  RE: LACP Cisco iOS/VOSS interconnection best practices

    Posted 12-23-2021 13:16
    Here you go

    https://extremeportal.force.com/ExtrArticleDetail?an=000083501&q=voss%20smlt%20lacp