Spanning-tree, Cisco 2950 vs 2924/3548 vs HP 2824

Discussion in 'Cisco' started by oxaze@hotmail.com, Mar 14, 2006.

  1. Guest

    Hi,

    I have "inherited" a net (currently running 49 vlans) which has a mix
    of ~110 relatively new
    Cisco 2950C/2950T/2950G switches plus older Cisco 2924XL/3548XL and
    also one new
    HP ProCurve 2824. The majority of all vlans extends across all
    switches. All trunks are
    802.1Q and all switches currently only have one uplink port.
    Spanning-tree is running on all
    (but I can't say I'm sure it works as it should) therefor the following
    questions (you'll have to
    excuse a newbie in this area).

    Approx. layout:
    2824 <--> 2950G <--> 3548XL <--> 2950C <--> 2950C <--> 2924XL <--> ...
    |
    2950 <--> 2924XL <--> 2924XL <--> 2950T <--> ...
    |
    2924XL <--> 2924XL <--> ...

    hp2824-1# sh span
    Regular Spanning Tree Information
    STP Enabled : Yes

    c2924-1#sh span
    Spanning tree 1 is executing the IEEE compatible Spanning Tree
    protocol

    c2950g-48-1#sh spanning-tree summary
    Switch is in pvst mode

    #1. Will current spanning-tree really work throughout the net if all
    switches has STP
    enabled (as shown above) while the Cisco 2950 models with enhanced
    image are running
    in pvst mode ? As I understand it all but those are running one
    spanning-tree per switch
    while those with enhanced are running one per vlan...

    #2. Is it possible in this setup, and will I gain something, having the
    HP switch plus all
    Cisco switches with enhanced image run RSTP/RPVST instead ? Will
    spanning-tree still
    work across all switches ?

    Comments anyone ?

    // Oxy

    P.S
    I know the current layout isn't the best but its what I have to live
    with for now.
    I cannot afford replacing all old switches with newer models...
    , Mar 14, 2006
    #1
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  2. Merv Guest

    IMHO your time would be best spent eliminating spanning-tree or
    miniming its reach, not changing its form.
    Merv, Mar 15, 2006
    #2
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