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

[Vivek Kashyap]

On Wed, 3 Mar 2010, Eric Blake wrote:

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

__

Vivek Kashyap
Linux Technology Center, IBM