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From: h bagade <bagadeh@gmail.com>
Date: Thu, 12 Dec 2013 08:46:58 +0330
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Subject: Unable to attach physical interfaces to netmap vale switch
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Hi all,

I've tried to attach my physical interfaces to vale using
vale-ctl -a em1
and encountered the error:
bdg_ctl [74] Unable to attach em1 to the bridge

But I can bridge em0 and em1 using netmap bridge!
I think if there is problem with registering the interface so I should not
be able to bridge them but I can. What's missing here?