topic Re: frequent 'spanning tree topology change from' alerts access switch in Wireless

frequent 'spanning tree topology change from' alerts access switches

JSNascimento — Mon, 28 Oct 2024 17:57:57 GMT

Hi everyone,

I’m experiencing frequent “spanning tree topology change from enterprise” alerts on several switches in different areas. I’ve already checked and confirmed that “spanning-tree portfast edge” and “spanning-tree bpduguard enable” are configured on all access switches. Has anyone dealt with this issue and can share their solution or insights? Thanks!

Re: frequent 'spanning tree topology change from' alerts access switch

balaji.bandi — Mon, 28 Oct 2024 18:03:01 GMT

If you like to not to happen this regularly, i suggest to setup a spanning tree priorty and root bridge and alternative root bridge

so the VLAN not have these kind of changes as regularly

again this is high level - but again we need to look where this happening and what device model and how your network looks like.

some guide lines :

https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html

https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/28943-170.html

Re: frequent 'spanning tree topology change from' alerts access switch

MHM Cisco World — Mon, 28 Oct 2024 18:26:21 GMT

You config port connect two SW as edge ?

That wrong you need to remove portfast edge in port connect SW

MHM

Re: frequent 'spanning tree topology change from' alerts access switch

JSNascimento — Mon, 28 Oct 2024 18:40:20 GMT

Thanks for your reply. I have set the following configuration on all access ports of the access switches:
interface GigabitEthernet1/0/4
switchport access vlan 31
switchport mode access
switchport port-security violation protect
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree portfast edge
spanning-tree bpduguard enable

Re: frequent 'spanning tree topology change from' alerts access switch

MHM Cisco World — Mon, 28 Oct 2024 18:47:23 GMT

Share topolgy if you can

MHM

Re: frequent 'spanning tree topology change from' alerts access switch

shambhu.kumar — Mon, 28 Oct 2024 18:56:25 GMT

On the trunk ports allow VLANS selectively specific vlans and not all vlans