What happens to tagged traffic on an access port?
These may also be referred to as “trunk” or “access” respectively. The purpose of a tagged or “trunked” port is to pass traffic for multiple VLAN’s, whereas an untagged or “access” port accepts traffic for only a single VLAN. Generally speaking, trunk ports will link switches, and access ports will link to end devices.
What does tagging a port mean?
Tagged VLANs A port is a ‘tagged port’ when the interface is expecting frames containing VLAN tags. An example of this is when two switches are connected, and pass tagged traffic. Cisco switches use the term ‘trunk’ to refer to a tagged port. The sender will send a frame with a VLAN tag.
What does an untagged port on a Cisco switch mean?
An untagged port, or access port on a Cisco switch, connects to hosts (such as a server). The host is unaware of any VLAN configuration. The connected host sends its traffic without any VLAN tag on the frames.
How does VLAN tagging on access port work?
If the incoming port is “switchport access vlan 10” then the switch adds tag 10 to the frame, when the switch will send the frame out, it depends on the outgoing interface how it will do with the tag. If the outgoing interface is a trunkport with native vlan=not vlan 10, then the switch send the frame with a tag 10.
How does untagged traffic behave on trunk and access ports?
Assign untagged incoming traffic as VLAN 24. Untag all outgoing traffic (only VLAN24, VLAN1 can be dropped). I have read many conflicting things online as to what happens when untagged traffic arrives on an ACCESS or TRUNK port. How does this behave for each? I currently have this set to ACCESS UNTAGGED with a PVID of 24. Is this correct?
Can a switch tag on a trunk port?
PC’s don’t tag (edit: unless there is NIC capable of tagging and tagging is enabled), a switch will only tag sending on a trunk port. If the port connected to PC-B was configured as trunk instead of access, then SW-B will send the frame tagged with vlan 10 to PC-B.