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STP problem : MSTI root change

  • 1.  STP problem : MSTI root change

    Posted Nov 29, 2020 12:14 PM
    Good day 
    I need someones expert advice on how to deal with the following. I have a two new 5400 v3 Switches in VSF  wich is to become my core. When I plug it in directly into the currentl distribution layer switch a 5400 v2 switch over 10g single mode fire it looks like I am getting a broadcast storm or port flapping. I dont know how to tackle this one. I would really appreciate any advise 
    Core Firmware version: KB.16.10.0010
    Distribution Firmware version: KB.16.10.0010

    Core stack 
    vsf
    enable domain 1
    member 1
    type "J9851A" mac-address 883a30-6c0400
    priority 128
    link 1 1/A1-1/A2
    link 1 name "I-Link1_1"
    exit
    member 2
    type "J9851A" mac-address 883a30-6ced00
    priority 128
    link 1 2/A1-2/A2
    link 1 name "I-Link2_1"
    exit
    port-speed 40g
    exit

    When I plug it in directly into the current distribution layer switch a 5400 v2 switch over 10g single mode fire I get the following

    I 11/29/20 14:19:25 00842 stp: AM1: CIST starved for a BPDU Rx on port A21 from
    0:40a8f0-df4a00
    I 11/29/20 14:19:25 00839 stp: AM1: CST Root changed from 0: 40a8f0-df4a00 to
    12288: (this device)
    I 11/29/20 14:19:25 00839 stp: AM1: IST Root changed from 0: 40a8f0-df4a00 to
    12288: (this device)
    I 11/29/20 14:19:25 00842 stp: AM1: MSTI 1 starved for an MSTI Msg Rx on port
    A21 from 0:40a8f0-df4a00
    I 11/29/20 14:19:25 00839 stp: AM1: MSTI 1 Root changed from 0: 40a8f0-df4a00 to
    32768: (this device)
    I 11/29/20 14:19:25 00842 stp: AM1: MSTI 2 starved for an MSTI Msg Rx on port
    A21 from 4096:40a8f0-df4a00
    I 11/29/20 14:19:25 00839 stp: AM1: MSTI 2 Root changed from 0: 40a8f0-df0d00 to
    32768: (this device)
    I 11/29/20 14:19:25 00839 stp: AM1: MSTI 1 Root changed from 32768: (this
    device) to 32768: 0019e7-ef8080
    I 11/29/20 14:19:26 00839 stp: AM1: MSTI 2 Root changed from 32768: (this
    device) to 32768: 0c8525-6ec400
    I 11/29/20 14:19:26 00002 vlan: AM1: VLAN80 virtual LAN disabled (1 times in 60
    seconds)
    I 11/29/20 14:19:26 00435 ports: AM1: port A21 is Blocked by STP
    I 11/29/20 14:19:26 00839 stp: AM1: CST Root changed from 12288: (this device)
    to 0: 40a8f0-df4a00
    I 11/29/20 14:19:26 00839 stp: AM1: IST Root changed from 12288: (this device)
    to 0: 40a8f0-df4a00
    I 11/29/20 14:19:26 00839 stp: AM1: MSTI 1 Root changed from 32768:
    0019e7-ef8080 to 0: 40a8f0-df4a00
    I 11/29/20 14:19:26 00839 stp: AM1: MSTI 2 Root changed from 32768:
    0c8525-6ec400 to 0: 40a8f0-df0d00


    ------------------------------
    Charl Cronje
    ------------------------------


  • 2.  RE: STP problem : MSTI root change

    Posted Nov 30, 2020 12:34 PM
    STP is not mandatory When you have vsf implemented on core switch. Configure link aggregation (trunks) for uplinks and enable loop-protect on access (edge ports).

    ------------------------------
    harendra nishshanka
    ------------------------------



  • 3.  RE: STP problem : MSTI root change

    Posted Dec 08, 2020 01:26 AM
    Thank you Harendra
    I have instead replaced the transceiver modules and setup spanning tree instances with spanning tree root priorities and will attempt the change again this Sunday

    ------------------------------
    Charl Cronje
    ------------------------------