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Re: [libvirt] [PATCH] web docs -- macvtap mode explanation



On Wed, 3 Mar 2010, Eric Blake wrote:

Date: Wed, 03 Mar 2010 10:00:43 -0700
From: Eric Blake <eblake redhat com>
To: Stefan Berger <stefanb us ibm com>
Cc: libvirt-list redhat com
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 redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org



__

Vivek Kashyap
Linux Technology Center, IBM


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