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  • 1.  Spanning Tree - RSTP

    Posted 06-20-2022 05:52
    Edited by Michael Pappas 06-21-2022 11:41
    I am designing a network in a collapsed core structure (Access switches connecting to the two cores). I have about 5 different VLANs
    Can someone please let me know what the ideal parameters to be configured to use the RSTP for an EX4550 switch are?

    Can I not enable RSTP on all interfaces at once, like cisco?

    And can someone please let me know what is shared interface mode? (Is it the one I should use for my design)

    set protocols rstp interface all mode ?
    Possible completions:
    point-to-point Interface mode is point-to-point
    shared Interface mode is shared

    ------------------------------
    Raj Pot


  • 2.  RE: Spanning Tree - RSTP

    Posted 06-20-2022 10:04
    Hi,

    RSTP is the way to go, no doubt if STP is needed.
    The CORE should be set to be the Root.
    The access-switches, just give them priority so it wont try to become master.
    The access-ports, configure as edge ports.
    Depending on the JunOS version, there isnt always a "all interface" command. One way to work around it is to use apply-groups maybe.
    Otherwise, enable it per interface.

    Edge switches:
    set protocols rstp bridge-priority 60k
    set protocols rstp interface ge-0/0/0.0 edge

    Trunk port (aka uplink) to Core:
    set protocols rstp interface xe-0/0/0 mode point-to-point

    Also optional stuff like
    set interfaces interface-range User_Edge_Port_Security_Settings member ge-0/0/0
    set interfaces interface-range User_Edge_Port_Security_Settings member "ge-0/0/[1-10]"
    set interfaces interface-range User_Edge_Port_Security_Settings description "Common parameters for all Edge interfaces"
    set ethernet-switching-options secure-access-port interface User_Edge_Port_Security_Settings mac-limit 5
    set ethernet-switching-options secure-access-port interface User_Edge_Port_Security_Settings mac-limit action shutdown
    set ethernet-switching-options bpdu-block interface User_Edge_Port_Security_Settings

    CORE to the access-switch
    set protocols rstp bridge-priority 48k
    set protocols rstp interface xe-0/0/1 mode point-to-point

    Other stuff to handle BUM traffic.
    set groups STORM-CTRL interfaces <ge*> unit 0 family ethernet-switching storm-control custom
    set groups STORM-CTRL interfaces <xe*> unit 0 family ethernet-switching storm-control custom
    set apply-groups STORM-CTRL
    set forwarding-options storm-control-profiles custom all bandwidth-percentage 1

    Hope it helps on building your network!
    //Rob




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