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Hi everyone,In Packet Tracer I have 8 Cisco 2960 switches and lots of devices in my topology. I have 5 VLANs: 11-15. I have a 2620 Cisco router with 5 sub-interfaces: fa0/0.11-15 configured with encapsulation dot1Q and assigned to the VLANs respectiv...
Georg helped me spot the issue - thank you so much!Essentially I have an access list on each VLAN.Without realising, I set VLAN 13 to deny communication with VLAN 12. Once the ACL for VLAN 13 is removed, everything works!