Issue with our network

[shinepothen]

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.

[Paul Kurtz]

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).

[shinepothen]

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  :

[shinepothen]

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.