"Q" setting on the vlan tab

[abjornson]

I'm very sorry if i could have found this elsewhere, but the forum won't let me search for "q" or "Q", and I don't think there's an official manual.

When configuring vlans, I know that "U" means untagged, "T" means tagged, and "E" means excluded.

I gather the "Q" setting has to do with q-in-q vlans....and I do use those in parts of my network. But what does the "Q" setting actually do? Will a regular trunk "T" port not pass q-in-q vlans? I don't see a way to make the wispswitch a member of a q-in-q vlan by specifying a second vlan id.

Thanks so much!

Andris

[sirhc]

I did a search for "QinQ" on the forum search box and I got this result:

viewtopic.php?f=6&t=974&p=7512&hilit=QinQ#p7445

[mike99]

Will a regular trunk "T" port not pass q-in-q vlans?

I was wondering the same thing first but seem like netonix with TAG option will only look at the first VLAN on the header of the paquet ignoring the following ones. It's confusing at first, not sur if it's standard since I didn't try QinQ on other brand of switch, but it's logic and easy to configure once you understand this.

[Dave]

thanks Mike99, your always on top of your game!

[sirhc]

When a packet leaves a port designated with a "T" the switch leaves the packet Tag intact so when the packet is a QinQ packet both the outer tag and inner QinQ Tag are left alone.

When a packet leaves a port designated with a "Q" the switch strips off the outer Tag but leaves the inner QinQ tag intact.

[abjornson]

Thanks all - this was exactly what I was looking for!

[rebelwireless]

This is very strange behavior....

see this:

Vlan50, port 9 is 'U'... 2,4,6,8 are 'T', those are hooked up to routers (i'm mid transition, so 2 for old, 2 for new). Port9 is an AF5X.

If I change Port9VLAN50 from U to Q, the router locks me out for the minute countdown... Here's the thing, my PC is in port 3, and my main uplink is on ports 6 and 8, and my other backhauls are on ports 1,5,7 on VLAN1... Port 9 isnt in VLAN1, so why does changing it to 'Q' take down all of the VLAN1 stuff?

[sirhc]

Changing U to Q is a drastic change.

A Q port will encapsulate any packet entering it within the VLAN ID tag (in this case 50) and Strip off the outer VLAN Tag when packets leave it leaving either the inner VLAN tag if one exists or an Untagged packet if there is no inner VLAN Tag.

If it worked with U it will not work when you change it to Q unless you make other changes on your network to deal with it.

[rebelwireless]

I'm going to drop back to a straight tagged VLAN on the ports for wherever I can and just do EoIP as a stop-gap. We don't have netonix switches everywhere quite yet and toughswitches....well..you know those are not so flexible.

[mike99]

On the following topic, cegner also conplain about loosing access to the switch after using QinQ.
viewtopic.php?f=17&t=1467&p=10858#p10860