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  1. Member
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    Jul 2016
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    #1

    Default Maximum MST instances

    Hi folks,

    I have read different numbers for the maximum number of MST instances:

    - "Cisco supports a maximum of 16 MSTI's in each region" - OCG page 279
    - "But each region can only support up to 64 spanning tree instances" - Cisco configuration guide - Configuring MSTP, page 16

    Are these two conflicting, or is there something about MST and RSTP going on here that I am unaware of?

    /Adrian
    2017 Goals: Cisco: [x]Switch [ ]Route [ ]Tshoot

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  3. Member
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    #2
    Got the answer (kind of) from Cisco discussions:

    It's vendor and implementation dependant.

    As an example, Nexus 3000 with NX-OS 7 supports up to 65 MST instances.....
    2017 Goals: Cisco: [x]Switch [ ]Route [ ]Tshoot

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  4. Member
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    #3
    No 16 limit on my 3550:

    mst.jpg
    2017 Goals: Cisco: [x]Switch [ ]Route [ ]Tshoot

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