On Wed, 3 Mar 2010, Eric Blake wrote:
Date: Wed, 03 Mar 2010 10:00:43 -0700
From: Eric Blake <eblake@xxxxxxxxxx>
To: Stefan Berger <stefanb@xxxxxxxxxx>
Cc: libvirt-list@xxxxxxxxxx
Subject: Re: [libvirt] [PATCH] web docs -- macvtap mode explanation
According to Stefan Berger on 3/3/2010 5:09 AM:
This adds more information about the different macvtap device modes.
+ <dl>
+ <dt><code>vepa</code></dt>
+ <dd>All VMs' packets are sent to the external bridge. Packets
+ whose destination is a VM on the same host as where the
+ packet originates from are sent back to the host by the VEPA
+ capable bridge (today's bridges are typically not VEPA capable).</dd>
Given that VEPA is relatively new and not common yet, is it worth a link
to some external page giving more details about VEPA, or even just
spelling out the acronym once?
VEPA is 'Virtual Ethernet Port Aggregator'. I included a description in an
earlier posting:
https://www.redhat.com/archives/libvir-list/2010-January/msg00721.html
The basic VEPA approach is described here:
http://www.ieee802.org/1/files/public/docs2009/new-evb-congdon-vepa-modular-0709-v01.pdf
thanks,
Vivek
+ <dt><code>bridge</code></dt>
+ <dd>Packets whose destination is on the same host as where they
+ originate from are directly delivered to the target macvtap device.
+ Both origin and destination devices need to be in bridge mode
+ for direct delivery. If either one of them is in <code>vepa</code> mode,
+ a VEPA capable bridge is required.
+ <dt><code>private</code></dt>
+ <dd>All packets are sent to the external bridge and will only be
+ delivered to a target VM on the same host if the are sent through an
s/the are/they are/
+ external router or gateway and that device sends them back to the
+ host. This procedure is followed if either the source or destination
+ device is in <code>private</code> mode.</dd>
+ </dl>
+
--
Eric Blake eblake@xxxxxxxxxx +1-801-349-2682
Libvirt virtualization library http://libvirt.org
__
Vivek Kashyap
Linux Technology Center, IBM
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