Zitat von mpachmann am 1. Februar 2023, 17:37 Uhr

https://community.sophos.com/sophos-switch/b/blog/posts/sophos-switch-maintenance-release-mr-2

The VLAN 0 priority tagging feature enables 802.1Q Ethernet frames to be transmitted with the VLAN ID set to zero. These frames are called priority-tagged frames. Setting the VLAN ID tag to zero allows the VLAN ID tag to be ignored and the Ethernet frame to be processed according to the priority configured in the 802.1P bits of the 802.1Q Ethernet frame header. The priority-tag ingress filtering function would ignore packets with the priority-tag to defend against attack packets using VLAN 0.