link aggregation - bundling 2 lagg interfaces together

[Damien Fleuriot]

On 2/4/11 1:42 PM, Bernhard Schmidt wrote:
> On Friday 04 February 2011 13:13:52 Damien Fleuriot wrote:
>> Hello list,
>>
>>
>>
>> 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 ?
>>
>> That would shatter my dreams :(
> 
> I have no clue if that is at all possible, or makes any sense at all, 
> but can't you just add all 4 ports one lagg interface?
> 


I'm afraid this is not an option, the switches are not stacked.

They will create 2 separate etherchannels, and I'll get alerts about the
MAC addresses flapping -.-