Avatar of Shark Attack
Shark Attack

asked on 

spanning-tree issue

I dont know why I'm having this issue but it's happenig. I am working on basic topology. Router to layer 3 switch to little trendnet L2 switch to hosts. Image attached. Very simple. For some reason, the switch in the middle, STP is blocking the port. I have no idea why. How can I fix this and why it this even blocked, there is no redundant links
interface GigabitEthernet0/4
 switchport access vlan 100
 switchport mode access
 switchport nonegotiate
 switchport port-security maximum 4
 switchport port-security violation restrict
 switchport port-security aging time 60
 switchport port-security aging type inactivity
 switchport port-security
 no keepalive

Open in new window

TEST_SW#sh spanning-tree blockedports

Name                 Blocked Interfaces List
-------------------- ------------------------------------
VLAN0100             Gi0/4

Number of blocked ports (segments) in the system : 1

Open in new window

There is no even loop. It's one link to the L2 switch thats all.

Can anyone help that actually know whats going on here? Lately I've been getting a lot of answers that were useless to me and did not help. Thank you
Switches / HubsNetworking

Avatar of undefined
Last Comment
Shark Attack

8/22/2022 - Mon