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  • 1.  bpdu-block doesn't drop vstp

    Posted 22 days ago
    Hi

    Model: ex4600-40f
    Junos: 21.4R3-S4.18

    Configuration: 3 * EX4600 in triangle topology, RSTP enabled on
    triangle interfaces only. All other interfaces are without any STP, with
    "protocols layer2-control bpdu-block interface XXX drop" protection.

    The EX2300 is connected to one of the bpdu-block protected interface.
    In EX2300 conf: "protocols vstp interface all; vlan 1; vlan all".

    In EX2300 log tons of lines appear:
    l2cpd[xxxx]: TOPO_CH: for VLAN xxxx in routing-instance
    default received on port xxx

    The issue disapeared when I've set "protocols vstp interface <uplink>
    disable".

    What's more fun, the problem doesn't appear with original Cisco
    with PVST enabled on uplink interface. ;)

    Any ideas?

    Boguslaw Juza</uplink>


  • 2.  RE: bpdu-block doesn't drop vstp

    Posted 20 days ago

    Additional explanation:

    In "l2cpd[xxxx]: TOPO_CH: for VLAN xxxx in routing-instance
    default received on port xxx" the "port xxx" is the uplink port.



    ------------------------------
    BOGUSLAW JUZA
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  • 3.  RE: bpdu-block doesn't drop vstp

    Posted 20 days ago

    Hi Boguslaw,

    VSTP and RSTP are the only spanning-tree protocols that can be configured concurrently on a device. They will operate independently and will not interact or interfere with each other. This is by design and it is recommended to enable both when in a mixed environment to allow RSTP to capture topologies not supported under a vlan.

    Regards,. 



    ------------------------------
    GAVIN WHITE
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  • 4.  RE: bpdu-block doesn't drop vstp

    Posted 20 days ago

    Hi Gavin,

    In my concept I'would like to drop any BPDU packet on selected interfaces. So I've set "protocols layer2-control bpdu-block interface XXX drop". And it works, except vstp. I don't need any interaction between spanning tree on these switches.

    Boguslaw



    ------------------------------
    BOGUSLAW JUZA
    ------------------------------