10-28-2024 10:57 AM
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!
10-28-2024 11:03 AM
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
10-28-2024 11:26 AM
You config port connect two SW as edge ?
That wrong you need to remove portfast edge in port connect SW
MHM
10-28-2024 11:40 AM
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
10-28-2024 11:47 AM
Share topolgy if you can
MHM
10-28-2024 11:56 AM
On the trunk ports allow VLANS selectively specific vlans and not all vlans
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