On 15/02/14 02:59, Luis R. Rodriguez wrote:
> From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
>
> The purpose of using a static MAC address of FE:FF:FF:FF:FF:FF
> was to prevent our backend interfaces from being used by the
> bridge and nominating our interface as a root bridge. This was
> possible given that the bridge code will use the lowest MAC
> address for a port once a new interface gets added to the bridge.
> The bridge code has a generic feature now to allow interfaces
> to opt out from root bridge nominations, use that instead.
[...]
> --- a/drivers/net/xen-netback/interface.c
> +++ b/drivers/net/xen-netback/interface.c
> @@ -42,6 +42,8 @@
> #define XENVIF_QUEUE_LENGTH 32
> #define XENVIF_NAPI_WEIGHT 64
>
> +static const u8 xen_oui[3] = { 0x00, 0x16, 0x3e };
You shouldn't use a vendor prefix with a random MAC address. You should
set the locally administered bit and clear the multicast/unicast bit and
randomize the remaining 46 bits.
(If existing VIF scripts are doing something similar, they also need to
be fixed.)
David
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