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  • 1.  Issue with our network

    Posted Sep 19, 2017 06:21 AM

    Hi All

    we have come across an issue on our 5412zl core switch, suddenly i got this message in the logs.

    W 09/19/17 14:12:09 02581 ip: ST1-CMDR: IPv4: Duplicate IPv4 address 10.10.40.71
                is detected on VLAN 1 with a MAC address of 9cdc71-04c27f (133 times
                in 60 seconds)

    My VLan 1 ip address is 10.10.40.71 when i run the command sh spanning tree

    MRF-DC-CORE-SW# sh spanning-tree

    Multiple Spanning Tree (MST) Information

      STP Enabled   : Yes
      Force Version : MSTP-operation
      IST Mapped VLANs : 1-4094
      Switch MAC Address : 9cdc71-04c27f  (the same mac address which is shown in the logs)
      Switch Priority    : 32768
      Max Age  : 20
      Max Hops : 20
      Forward Delay : 15

    ----------------------------------------------------------------------------------------

    The consequence we faced was all the vlans on the switch went to disable mode and then got enabled there was total down time of 12 mins,

    belong is logs for one vlan

    I 09/19/17 14:12:11 00839 stp: ST1-CMDR: CST Root changed from 32768:
                0002b9-32e200 to 32768: 0019bb-93c700
    I 09/19/17 14:12:12 00839 stp: ST1-CMDR: CST Root changed from 32768:
                0019bb-93c700 to 32768: 001279-03da00
    I 09/19/17 14:12:12 00435 ports: ST1-CMDR: port 1/I12 is Blocked by STP
    I 09/19/17 14:12:12 00002 vlan: ST1-CMDR: Administrator_Vlan_54 virtual LAN
                disabled
    I 09/19/17 14:12:12 00002 vlan: ST1-CMDR: ITS_SAP_CG virtual LAN disabled
    I 09/19/17 14:12:12 00435 ports: ST1-CMDR: port 1/I4 is Blocked by STP
    I 09/19/17 14:12:12 00076 ports: ST1-CMDR: port 1/I4 in Trk54 is now on-line
    I 09/19/17 14:12:12 00001 vlan: ST1-CMDR: Administrator_Vlan_54 virtual LAN
                enabled

    -----------------------------------------------------------------------------------

    Have any one has come across any such issue my environmnet is working prefectly since last 8months since the installation of core 5412 zl.

    All your help and support is appreciated.


    #L3
    #Switching
    #Network
    #infra


  • 2.  RE: Issue with our network

    Posted Sep 19, 2017 03:40 PM

    Sounds like MSTP did it job maybe, did some one add a switch to the network?

    What devices have these MACs below

    I 09/19/17 14:12:11 00839 stp: ST1-CMDR: CST Root changed from 32768:
                0002b9-32e200 to 32768: 0019bb-93c700
    I 09/19/17 14:12:12 00839 stp: ST1-CMDR: CST Root changed from 32768:
                0019bb-93c700 to 32768: 001279-03da00

    I belive you could set the priority of the core switch to 0 to avoid this if it is your core(root of MSTP).

     



  • 3.  RE: Issue with our network

    Posted Sep 28, 2017 12:01 AM

    Thank you Paul for the suggestion to change the priority of the core switch to 0.

    We have done that made core switch as priority 0.

    when i get the show spanning-tree output, i can see that the topology change count still changes i have pasted the output below.

    sh spanning-tree

     Multiple Spanning Tree (MST) Information

      STP Enabled   : Yes
      Force Version : MSTP-operation
      IST Mapped VLANs : 1-4094
      Switch MAC Address : 9cdc71-04c27f
      Switch Priority    : 32768
      Max Age  : 20
      Max Hops : 20
      Forward Delay : 15

      Topology Change Count  : 2,060,101
      Time Since Last Change : 40 secs

      CST Root MAC Address : 9cdc71-04c27f
      CST Root Priority    : 0
      CST Root Path Cost   : 0
      CST Root Port        : This switch is root

      IST Regional Root MAC Address : 9cdc71-04c27f
      IST Regional Root Priority    : 0
      IST Regional Root Path Cost   : 0
      IST Remaining Hops            : 20

      Root Guard Ports     :
      Loop Guard Ports     :
      TCN Guard Ports      :
      BPDU Protected Ports :
      BPDU Filtered Ports  :
      PVST Protected Ports :
      PVST Filtered Ports  :

      Root Inconsistent Ports  :
      Loop Inconsistent Ports  :

     

     

     



  • 4.  RE: Issue with our network

    Posted Oct 06, 2017 01:27 AM

    From the logs what we can say is that even after changing the switch priority to 0
    we are noticing STP Topology changes.


    MRF-DC-CORE-SW# sh spanning-tree

     Multiple Spanning Tree (MST) Information

      STP Enabled   : Yes
      Force Version : MSTP-operation
      IST Mapped VLANs : 1-4094
      Switch MAC Address : 9cdc71-04c27f
      Switch Priority    : 0
      Max Age  : 20
      Max Hops : 20
      Forward Delay : 15

      Topology Change Count  : 23,091
      Time Since Last Change : 5 mins

      CST Root MAC Address : 9cdc71-04c27f
      CST Root Priority    : 0
      CST Root Path Cost   : 0
      CST Root Port        : This switch is root

    Is it a normal function of HP switch or do we need to take an necessary action.