Questions about Spanning Tree - TCP-IP

This is a discussion on Questions about Spanning Tree - TCP-IP ; ---------------------------------------------------------------------------- | SWITCH | | P0 P1 P2 P3 ... Pn | ---------------------------------------------------------------------------- | | | | | | | | ----------------- --- I can understand how spanning tree protocol handle the loopbacks between different ports, like P0 and P1 ...

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Thread: Questions about Spanning Tree

  1. Questions about Spanning Tree

    ----------------------------------------------------------------------------
    | SWITCH |
    | P0 P1 P2 P3 ... Pn |
    ----------------------------------------------------------------------------
    | | | |
    | | | |
    ----------------- ---

    I can understand how spanning tree protocol
    handle the loopbacks between different ports,
    like P0 and P1 in the picture above. But
    I'm wondering how spanning tree protocol deal
    with the P2 situation. The port loopbacks with
    itself, the BPDU sended and received will
    be the same, then stp use what to know this
    is a loopback?

  2. Re: Questions about Spanning Tree

    In article
    <85e4e6ec-04df-40bb-9c99-31c2ae585ed8@j33g2000pri.googlegroups.com>,
    lookingupsky@gmail.com wrote:

    > ----------------------------------------------------------------------------
    > | SWITCH |
    > | P0 P1 P2 P3 ... Pn |
    > ----------------------------------------------------------------------------
    > | | | |
    > | | | |
    > ----------------- ---
    >
    > I can understand how spanning tree protocol
    > handle the loopbacks between different ports,
    > like P0 and P1 in the picture above. But
    > I'm wondering how spanning tree protocol deal
    > with the P2 situation. The port loopbacks with
    > itself, the BPDU sended and received will
    > be the same, then stp use what to know this
    > is a loopback?


    I think you'd be better off asking this in a LAN newsgroup
    (comp.dcom.lans?), it's not a TCP/IP issue.

    Also, make sure you use a fixed-width font and no TABs when making ASCII
    diagrams, so that the wires line up properly with the port numbers.

    --
    Barry Margolin, barmar@alum.mit.edu
    Arlington, MA
    *** PLEASE don't copy me on replies, I'll read them in the group ***

  3. Re: Questions about Spanning Tree

    On Aug 21, 10:57*pm, lookingup...@gmail.com wrote:
    > ----------------------------------------------------------------------------
    > | * * * * * * * * * * * * * * * SWITCH * * * * * * * * * * * * * * * *|
    > | * * * * * * * P0 * * *P1 * * * * * * *P2 * * * * *P3 *... *Pn * |
    > ----------------------------------------------------------------------------
    > * * * * * * * * | * * * * * * * | * * * * * *| |
    > * * * * * * * * | * * * * * * * | * * * * * *| |
    > * * * * * * * * ----------------- * * * * * *---
    >
    > I can understand how spanning tree protocol
    > handle the loopbacks between different ports,
    > like P0 and P1 in the picture above. But
    > I'm wondering how spanning tree protocol deal
    > with the P2 situation. The port loopbacks with
    > itself, the BPDU sended and received will
    > be the same, then stp use what to know this
    > is a loopback?


    Each configuration BPDU includes a bridge identifier and a port
    identifier. If you receive a BPDU identifier that contains your
    bridge identifier and the port identifier for the port you received it
    on, you know that port is looped back directly or indirectly. In
    either case, you won't use the port.

    DS

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