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From Arnaud Gaillard <>
Subject Cloudstack mixing Vlan and creating a big mess...
Date Tue, 23 Oct 2012 09:18:20 GMT

We are currently facing a critical issue.

Cloudstack is currently mixing vlan for VM migration or creation bringing
down part of our network.

We are currently using multiple guest network with different Vlan for

Here is a quick exemple (extract from the cloud agent log in debug mode):


As you can see broadcastUri and isolationUri are not in the same Vlan. The
Vlan120 is only present on another physical interface (CloudVirBr120), and
must not be present on this interface. In order for this to work broadcast
and isolation must both be in the 811 vlan. The same problem arise from
deviceid1 where the mix is inverted....

>From where does cloudstack get the value for Broadcast and Isolation URI?
How can such a mix/mess happend?

Thanks for your help!


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