Hello,

On recent fedora-18 NetworkManager started to set default STP for the bridges 
to on, this is a change in the default of distribution, which up until now was 
off, I opened a bug[1].

If you experiencing disconnect of hosts from network due to STP detection, a 
workaround is available.

Simply add:
---
STP="off"
---

To the wired interfaces (eth0, em1...) before host deployment, this will be 
copied to the management bridge and will prevent NetworkManager to use its 
default.

Regards,
Alon Bar-Lev.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=922702
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