ExtremeSwitching (EXOS)

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  • 1.  Exos to Cisco PVST+ Spanning-tree setup

    Posted 01-18-2022 11:58
    Running Exos 16.2.x on 450-G1
    trying to setup a compatible spanning tree with a cisco 3560
    2 vlans 1 (Default) and 2 (Data)
    keep getting invalid carrier vlan configuration.
    Is 16.2 old enough to have issues with Cisco's pvst+ config?


  • 2.  RE: Exos to Cisco PVST+ Spanning-tree setup

    Posted 01-18-2022 16:05
    Additional info: I think the config i setup below is now working default vlan and data vlan. Can someone tell me if that looks correct?


    configure stpd s0 mode dot1w
    configure stpd s0 default-encapsulation pvst-plus
    create stpd s2
    configure stpd s2 mode dot1w
    configure stpd s2 default-encapsulation pvst-plus
    enable stpd s2 auto-bind vlan data
    enable stpd s2 tag 0
    enable stpd s0
    enable stpd s2



  • 3.  RE: Exos to Cisco PVST+ Spanning-tree setup

    Posted 02-18-2022 08:55
    Hello Patrick,

    using PVST+ between EXOS 16.2 and Cisco IOS should be possible. One caveat is that Cisco PVST+ comprises an additional standards compliant rapid STP instance, and this needs to be added to the EXOS configuration as well.

    Some time ago I have successfully tested PVST+ interoperability between EXOS 16.1 on X460 switches and Cisco Catalyst 3560. Please see https://www.unix-ag.uni-kl.de/~auerswal/exos-cisco-rapid-pvstp/ for all the details, including the tested configurations.

    Hope that helps,
    Erik