Does bonding driver support 802.3ad "port-priority"?

Does bonding driver support 802.3ad "port-priority"?

[Martin T]

Hi,

does Linux bonding driver support 802.3ad "port-priority" feature? For
example in Cisco devices one can assign a "lacp port-priority" to each
port on a device running LACP. The port priority is used to decide
which ports should be put in standby mode when a hardware limitation
or the "lacp max-bundle" command configuration prevents all compatible
ports from aggregating. Such feature is also supported for example on
Juniper gear. Based on "Linux Ethernet Bonding Driver HOWTO" bonding
driver does not seem to support this feature..


thanks,
Martin

Re: Does bonding driver support 802.3ad "port-priority"?

[Jay Vosburgh]

Martin T <m4rtntns@gmail.com> wrote:
[...]
>does Linux bonding driver support 802.3ad "port-priority" feature? For
>example in Cisco devices one can assign a "lacp port-priority" to each
>port on a device running LACP. The port priority is used to decide
>which ports should be put in standby mode when a hardware limitation
>or the "lacp max-bundle" command configuration prevents all compatible
>ports from aggregating. Such feature is also supported for example on
>Juniper gear. Based on "Linux Ethernet Bonding Driver HOWTO" bonding
>driver does not seem to support this feature..

	No, it doesn't.  All bonding slaves are set to port priority
(Actor_Port_Priority) of 255, and bonding has no equivalent to the
max-bundle option.  The LAG selection logic described in 802.1AX 5.6.1
is not implemented, as bonding does not restrict the size of an
aggregation.

	-J

---
	-Jay Vosburgh, jay.vosburgh@canonical.com

Re: Does bonding driver support 802.3ad "port-priority"?

[Martin T]

Jay,

thanks for confirming this!


regards,
Martin

On Fri, Jun 2, 2017 at 10:25 PM, Jay Vosburgh
<jay.vosburgh@canonical.com> wrote:
> Martin T <m4rtntns@gmail.com> wrote:
> [...]
>>does Linux bonding driver support 802.3ad "port-priority" feature? For
>>example in Cisco devices one can assign a "lacp port-priority" to each
>>port on a device running LACP. The port priority is used to decide
>>which ports should be put in standby mode when a hardware limitation
>>or the "lacp max-bundle" command configuration prevents all compatible
>>ports from aggregating. Such feature is also supported for example on
>>Juniper gear. Based on "Linux Ethernet Bonding Driver HOWTO" bonding
>>driver does not seem to support this feature..
>
>         No, it doesn't.  All bonding slaves are set to port priority
> (Actor_Port_Priority) of 255, and bonding has no equivalent to the
> max-bundle option.  The LAG selection logic described in 802.1AX 5.6.1
> is not implemented, as bonding does not restrict the size of an
> aggregation.
>
>         -J
>
> ---
>         -Jay Vosburgh, jay.vosburgh@canonical.com