From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Fri, 7 Mar 2008 18:17:50 -0800
From: Stephen Hemminger <shemminger@linux-foundation.org>
Message-ID: <20080307181750.2e7d8c33@extreme>
In-Reply-To: <2387247e0803071710n116bc1b6j577104db2b56b5c9@mail.gmail.com>
References: <2387247e0803071710n116bc1b6j577104db2b56b5c9@mail.gmail.com>
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Subject: Re: [Bridge] span/monitor port
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To: Gabriel Somlo <gsomlo@gmail.com>
Cc: bridge@lists.linux-foundation.org

On Fri, 7 Mar 2008 20:10:46 -0500
"Gabriel Somlo" <gsomlo@gmail.com> wrote:

> Hi,
> 
> I was wondering if there's an established way to set up one or more
> ports of a bridge as 'span'
> or 'monitor' ports. I.e., once a port is in this state, it discards
> any packets it receives, and gets
> a copy of any other packet the bridge is forwarding out any other
> port. Kind-of like cisco's span
> monitor session.
> 
> If not, I'd be interested in having a go at it, but wanted to see if
> there's anything already there
> that I'm missing...
> 

It isn't really a bridge function, the way to do this is to use
other facilities like the mirred action (see tc action).