Community Feedback

 View Only
last person joined: yesterday 

How is the community doing? Do you have any questions or feedback related for the Airheads Community team? This is the place to let us know.
Back to discussions
Expand all | Collapse all

STP problem : MSTI root change

This thread has been viewed 20 times

  • 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
    ------------------------------

    Original Message


  • 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
    ------------------------------

    Original Message