OS-6360 P-10 - Topology Change Storm detected on port

[frazerdsouza]

Dear Team,
Received OS6360-P10 8.7.98.R03 GA.
Configured the switch as below
s-> show configuration snapshot
! Chassis:
system name "OS6360"

! Configuration:
configuration error-file-limit 2

! Capability Manager:
! Virtual Flow Control:
! LFP:
! Interface:
! Port_Manager:
! Link Aggregate:
! VLAN:
vlan 1 admin-state enable
vlan 35 admin-state enable
vlan 100 admin-state enable
vlan 100 members port 1/1/9 untagged
vlan 35 members port 1/1/9 tagged

! PVLAN:
! Spanning Tree:
spantree mode flat
spantree vlan 1 admin-state enable
spantree vlan 35 admin-state enable
spantree vlan 100 admin-state enable

When connected the Uplink on management port i get the below
Tue Dec 6 16:53:34 : stpCmm _STPt WARN message:
+++ Topology Change Storm detected on port 1/1/9

Can you please help me on the same?

[Gleylancer]

This is a network design issue. What is connected on Port 1/1/9 and what's the port/spantree configuration there?

[frazerdsouza]

Port 1/1/9 is the uplink..Vlan 100 as untagged and rest of the VLAN as tagged. I do have OS6350 switch on the network. Where I dont have this type of issues..

[Gleylancer]

Something on the uplink is causing this. Consider configuring spanning tree with correct priorities on all connected devices.

[silvio]

What is the stp-mode at the other switches (f.e. 6350): flat or 1x1
All switches need to have the same mode - your 6360 has flat.

[frazerdsouza]

I have installed many other model switches on network without any issues on this model has the problem.

This is my core switch Spanning Tree config
----------------------------------------
show spantree mode
Spanning Tree Global Parameters
Current Running Mode : 1x1,
Current Protocol : N/A (Per VLAN),
Path Cost Mode : AUTO,
Auto Vlan Containment : N/A
Cisco PVST+ mode : Disabled
Vlan Consistency check: Disabled

[Gleylancer]

The mode differs, change the configuration to the correct mode.

[silvio]

I have installed many other model switches on network without any issues on this model has the problem.

This is my core switch Spanning Tree config
----------------------------------------
show spantree mode
Spanning Tree Global Parameters
Current Running Mode : 1x1,
Current Protocol : N/A (Per VLAN),
Path Cost Mode : AUTO,
Auto Vlan Containment : N/A
Cisco PVST+ mode : Disabled
Vlan Consistency check: Disabled

this f.e. is AOS R6 - your 6360 is AOS R8. Are you realy sure about the same STP-mode? In R8 you need to disable auto-fabric.

[frazerdsouza]

By default switch is on flat mode. My network is on per-vlan
the changes must be globally. Hence I followed below command

-> show spantree mode
Spanning Tree Global Parameters
Current Running Mode : Flat,
Current Protocol : RSTP,
Path Cost Mode : AUTO,
Auto Vlan Containment : Disabled

auto-fabric admin-state disable

Save Configuration:-
show spantree mode
Spanning Tree Global Parameters
Current Running Mode : Per VLAN,
Current Protocol : N/A (Per VLAN),
Path Cost Mode : AUTO,
Auto Vlan Containment : N/A
Cisco PVST+ mode : Disabled
Vlan Consistency check: Disabled

This solved the issue