[nog] LACP between swiches and Linux

Boyan Krosnov boyan at krosnov.org
Sat Nov 29 00:20:14 EET 2014

As usual too little sleep leads to mistakes.

802.1ax is LACP, not MC-LAG. MC-LAG is only available in a few 
implementations which follow the LACP protocol, but split one (or both) 
of LACP end-points to multiple devices (chassis). To achieve this they 
need to do some form of synchronization between the two (or more) parts 
of the endpoint.

Now depending on what you are trying to achieve, you may do link 
aggregation / bonding without LACP. You may use some other form link 
monitoring, e.g. ICMP or ARP. In that case you simply put both ports on 
the switches in the same VLAN/VLANs, and make sure frames from a 
particular MAC address are always sent over the same link (as switches 
don't like updating their mac address table too often).

Best regards,

On 2014-11-28 22:22, Boyan Krosnov wrote:
> Hi,
> The standard way of doing this is 802.1ax. 
> http://en.wikipedia.org/wiki/MC-LAG
> It is unlikely your switch supports this.
> There are non-standard implementations which come disguised as "switch 
> stacking". That's also unlikely to be supported by your switch.
> It is probably easier to make this work with a static config, rather 
> than LACP.
> Best regards,
> BK
> On 2014-11-28 21:28, Marian Marinov wrote:
>> Hash: SHA1
>> Hi guys,
>> I'm curious have anyone managed to make LACP working between two 
>> Switches and one Linux box?
>> The setup is simple, the linux box has two ethernets, each connected 
>> to separate switches. The switches have direct
>> connectivity between them.
>> Is it at all possible. The protocol it self does not impose 
>> restrictions on LACP ports to be on the same physical
>> device, but I don't know if there is an HW implementation that can 
>> actually do that.
>> Marian
>> - -- Marian Marinov
>> Founder & CEO of 1H Ltd.
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