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redundant trunk group design

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  • 1.  redundant trunk group design

    Posted 07-08-2019 07:24
      |   view attached

    Hi All,

    I have the following topology for a specific vlan.

    The switch named switch-4 has to be connected as per this topology.

    Is it a valid design to apply the concept of RTG on this switch  (switch-4)in the uplink to switch 2 and switch 3?

     

    Thanks.

     

     


    #RTG


  • 2.  RE: redundant trunk group design
    Best Answer

    Posted 07-08-2019 08:56

    If the picture shows complete L2 topo, then RTG on switch4 for green links should work fine.

    Switch4 will break the loop by using only one interface from RTG at a time (packets, BPDUs on backup interface will be discarded).

     

    You don't have to disable STP on links between switch1-2 and 1-3. Only requirement here is to disable STP on switch4 for links participating in RTG.



  • 3.  RE: redundant trunk group design

    Posted 07-08-2019 10:32
    only the green lines are new conmection and topology. Black lines are legacy config and connection. Thanks!!


  • 4.  RE: redundant trunk group design

    Posted 07-08-2019 09:15

    You wrote: I have the following topology for a specific vlan.

     

    RTG is per interface and not per vlan, soeither all or none

    if you need quick convergence have a look at Ethering Protection SWitching

    or VC or VCF

     

    regards

     

    alexander



  • 5.  RE: redundant trunk group design

    Posted 07-08-2019 09:57

    Hi FabNewCert 

     

    Yes, If the active link fails, the secondary link automatically starts forwarding data traffic without waiting for normal spanning-tree protocol convergence.