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Hi, could any body clarify what are the result of this settings?

I have a Cisco swicth and I am a Little confused between trunk, Access, and tagged or untagged ports.

For example:

Port 1: Mode: Trunk PVID:2 Where vlan 2 is Untagged, vlan 1 and vlan 3 are excluded (Device gets settings of vlan2?)

Port 2: Mode: Access PVID:2 Where vlan 2 is Untagged, vlan 1 and vlan 3 are excluded (Device gets settings of vlan2?)

Port 3: Mode Access PVID: 3 Where vlan 3 is Untagged, vlan 1 and vlan 2 are excluded(Device gets settings of vlan3?)

Port 4: Mode Trunk PVID: 1 Where vlan 1 is Untagged, vlan 2 and vlan 3 are tagged (pass all vlans?)

Port 5: Mode Trunk PVID: 1 Where vlan 1 is Untagged, vlan 2 and vlan 3 are excluded (pass all vlans?)

4 Spice ups
2

When you set a port as untagged on a VLAN, any traffic that comes in without a tag is placed on that VLAN. So for your first example, untagged traffic would go to VLAN2.

When you have traffic that is tagged by a device, such as VoIP phone, or Access point, the port that is connected on must be configured to allow traffic on that VLAN. Some switches denote this by allowing you to tag that switch on that VLAN. If you don’t do this, traffic is discarded.

Cisco switches configured with Trunk ports will allow all VLANs unless you exclude them. An access port only allows untagged traffic and it will go to the VLAN that you define for the port.

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3

Sounds like you have a cisco small business switch. They are much harder to configure in my opinion.

Trunk ports: used to link a switch to another switch or router

Access ports: Used for regular devices in your network

Port 1: Mode: Trunk PVID:2 Where vlan 2 is Untagged, vlan 1 and vlan 3 are excluded -

I think the small business switch will interpret those settings like this: Vlans 1 and 3 can’t pass over this link, and any frame that is not tagged will be assigned to vlan 2

4

PatrickFarrell, that is probably the best explanation of tagged and untagged traffic I’ve heard. Great job

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5

Thank you :slight_smile:

6

Thanks a lot, I think both of you are right!! It is indeed a Small Bussiness Switch