link aggregation - bundling 2 lagg interfaces together

[Dan Nelson]

In the last episode (Feb 04), Damien Fleuriot said:
> I have a firewall with 2x Intel pro dual port cards.
> 
> On Intel A , port 1 goes to switch 1, port 2 goes to switch 2
> On Intel B , port 1 goes to switch 1, port 2 goes to switch 2
> 
> I have created the following 2 lagg devices using LACP:
> 
> lagg0 = A1 + B1
> lagg1 = A2 + B2
> 
> This works fine.
> 
> Now, what I had in mind was creating a lagg2 device using lagg0 and
> lagg1 with failover.
> 
> That would provide redundancy in case of a switch failure.
> 
> ifconfig won't let me though:
> 
> # ifconfig lagg2 laggproto failover laggport lagg0 laggport lagg1
> ifconfig: SIOCSLAGGPORT: Invalid argument
> 
> I suppose it's not possible to aggregate lagg interfaces ?

Apparently not: http://fxr.watson.org/fxr/source/net/if_lagg.c#L516

It looks like there is preliminary code under #ifdef LAGG_PORT_STACKING, but
it claims to be untested.

-- 
	Dan Nelson
	dnelson at allantgroup.com