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is it possible to run a vlan trunk inside another vlan trunk

Posted on 2011-09-14
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Last Modified: 2012-05-12
I lease a transparent ethernet connection between two different places from an ISP. The connection is given to me by having access to one port on one of their switches at one place, and another port at another switch at the other place. I've learned that they have this switched network where I have one VLAN id in it. It all works perfectly with untagged ethernet traffic between two hosts, one on each side of the link. (H1 - ISP - H2)

Now I need to know if it is possible for me to run a VLAN Trunk on this line. So instead of testing with the actual connection, I tried at the lab with four HP Procurve switches (1810G), but I was not successful. I set up one trunk between two switches (pair A). Then I set up another pair (pair B) of switches, the exact same way, but giving them a different trunk name. I could test both pairs by pinging from one host (H1) on one untagged port of one switch to another host (H2) on an untagged port on the other side.
H1 - A1 - A2 - H2 (ping ok)
H1 - B1 - B2 - H2 (ping ok)

Then I reconnected them in a line H1 - A1 - B1 - B2 - A2 - H2. I did not get a ping through.

 I would like to have an answer whether this is possible or not, and if it is possible, how to set it up.
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Question by:lefodnes
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4 Comments
 
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Expert Comment

by:Don Johnston
ID: 36540054
Yes, it's possible. The method is called "Q-in-Q trunking". But, it's has to be offered by the provider.

So you would need to ask your provider if they offer this service.
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Author Comment

by:lefodnes
ID: 36540094
Ok, thanks. And the reason why I don't get it to work on my procurve test switches, is that they don't have "Q-in-Q trunking"? Haven't seen that in the management pages. I use HP Procurve 1810G-8 J9449A (also the 24 port version).
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Accepted Solution

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Don Johnston earned 125 total points
ID: 36540245
Probably. Offering Q-in-Q trunking is usually only something service providers need. So it's usually a feature on higher end switches.
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Author Closing Comment

by:lefodnes
ID: 36540263
I'll ask for Q-in-Q trunking with my ISP. Thank you for letting me know the correct term for it.
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