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Spanning Tree config with Routing Instances?

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  • 1.  Spanning Tree config with Routing Instances?

    Posted 12-11-2018 11:40

    I have VSTP confiured on a EX4600 that has multiple routing instances.  I have VSTP configrued at what I assume is the global switch level (ie "edit protocols vstp") and it appears to be working fine.  However, I have just noticed that there is also the capability to configure spanning tree within routing instances by using "edit routing-instance <instance name> protocols vstp".

     

    What is the difference between configuring STP at the global switch level vs configuring within the routing instance?   Am I configuring STP wrong, should I be configuring under the routing instances?



  • 2.  RE: Spanning Tree config with Routing Instances?
    Best Answer

    Posted 12-11-2018 20:45

    Hello,

    Spanning Tree configuration is supported only for Routing Instances of "type virtual-switch" or "type layer2-control".

    And those instances are for advanced use cases such as :

    1/"layer2-control" instance is the "access circuit-facing control plane" for VPLS (which means it runs STP towards access circuit/AC only and never injects STP BPDU into VPLS core and also provides stitching of STP AC state to VPLS signaling)

    https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/layer-2-services-routing-instance-minimum-configuration-layer2-control.html

    2/ virtual-switch instance allows segmenting Your L2 network into separate subdomains where VLAN-ids can overlap between subdomains (i.e. VLAN-id 100 on ge-0/0/0 inside virtual-switch vS1 is totally separate from VLAN-id 100 on ge-1/0/0 inside virtual-switch Vs2, without any VLAN rewrite)

    https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/layer-2-services-virtual-switch-configuring.html

    HTH

    Thx

    Alex 

     



  • 3.  RE: Spanning Tree config with Routing Instances?

    Posted 12-13-2018 13:57

    We are using "virtual router" instance type, so I understand that configuration of STP within routing instance does not apply to us.  Thanks for the info.