[ovs-discuss] Ping failing when 2 switches are connected using a bond

[Ben Pfaff]

Active-backup only transmits and accepts packets on a single interface
at a time.  If the two switches don't choose the same interface at a
given time, packets get blackholed.

On Fri, Jan 15, 2016 at 03:35:40PM +0000, Herdoiza, David Alejandro wrote:
> Is there a way to connect two bonds directly without using LACP?
> 
> I have a specific case where a need this scenario 
> 
> Do you know, technically, why this won't work? I've trying to make it work, sometimes (~50%) the ping works and sometimes the ping doesn't work, I mean the ARP packets are not being dropped, do you know why this works sometimes?
> 
> Thanks for your help,
> David
> 
> -----Original Message-----
> From: Ben Pfaff [mailto:blp at ovn.org] 
> Sent: jueves 14 de enero de 2016 11:40 a.m.
> To: Herdoiza, David Alejandro
> Cc: Justin Pettit; discuss at openvswitch.org
> Subject: Re: [ovs-discuss] Ping failing when 2 switches are connected using a bond
> 
> On Thu, Jan 14, 2016 at 03:05:08PM +0000, Herdoiza, David Alejandro wrote:
> > I've been using balance-slb but I've tested with active-backup too with the same results.
> > 
> > Yes both  sides are using the same type
> 
> You can't use slb or active-backup like that.  They expect to be plugged into ports a dumb switch, not to another bond of the same type on the other side.  If you want to connect two bonds directly, use lacp.