[ovs-discuss] Strange behavior with paths longer than 5 hops.

[Vjekoslav Brajkovic]

Would you happen to know what needs to be patched in order to
modify/remove this behavior?

On Tue, Jul 17, 2012 at 7:38 PM, Jesse Gross <jesse at nicira.com> wrote:
> On Tue, Jul 17, 2012 at 7:32 PM, Vjekoslav Brajkovic
> <balkan at cs.washington.edu> wrote:
>> Hi,
>>
>> I ran into this problem and I think it might be a bug. The problem is
>> most likely somewhere on the datapath, as it appears to be happening
>> with and without a controller.  Here are the steps to reproduce it.
>>
>> (container 0) <--> sw0 <--> sw1 <--> sw2 <--> sw3 <--> sw4 <--> sw5
>> <--> sw6 <--> sw7 <--> (container 1)
>>
>> It appears to be happening with paths that are above 5 hops. Both with
>> OVS 1.4.2 and 1.6.1.
>
> It's not a bug, it's intentional behavior.  In order to avoid blowing
> out the kernel stack in the event of a loop or excessive number of
> hops we limit the number of times a packet can traverse the datapath
> to 5.