[ovs-dev] [rspan 1/2] Document that mirroring to a GRE tunnel works and is better than RSPAN.

Ethan Jackson ethan at nicira.com
Sat Aug 6 01:17:34 UTC 2011


Looks good.

Ethan

On Fri, Aug 5, 2011 at 16:59, Ben Pfaff <blp at nicira.com> wrote:
> ---
>  vswitchd/vswitch.xml |   16 ++++++++++++----
>  1 files changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
> index b3029eb..e4efa99 100644
> --- a/vswitchd/vswitch.xml
> +++ b/vswitchd/vswitch.xml
> @@ -1656,10 +1656,14 @@
>       <column name="output_port">
>         <p>Output port for selected packets, if nonempty.</p>
>         <p>Specifying a port for mirror output reserves that port exclusively
> -          for mirroring.  No frames other than those selected for mirroring
> -          will be forwarded to the port, and any frames received on the port
> -          will be discarded.</p>
> -        <p>This type of mirroring is sometimes called SPAN.</p>
> +        for mirroring.  No frames other than those selected for mirroring
> +        will be forwarded to the port, and any frames received on the port
> +        will be discarded.</p>
> +        <p>
> +          The output port may be any kind of port supported by Open vSwitch.
> +          It may be, for example, a physical port (sometimes called SPAN), or a
> +          GRE tunnel (sometimes called ERSPAN).
> +        </p>
>       </column>
>
>       <column name="output_vlan">
> @@ -1727,6 +1731,10 @@
>           Open vSwitch is being used as an intermediate switch, learning can be
>           disabled by adding the mirrored VLAN to <ref column="flood_vlans"/>
>           in the appropriate <ref table="Bridge"/> table or tables.</p>
> +          <p>
> +            Mirroring to a GRE tunnel has fewer caveats than mirroring to a
> +            VLAN and should generally be preferred.
> +          </p>
>       </column>
>     </group>
>
> --
> 1.7.4.4
>
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