[ovs-discuss] In flow entries should 'action' be set to normal for BFD control packets

[Padma Jayasankar]

Hi,
 I want to monitor the links that form a path between two hosts. when any
of the link fails the source switch has to be intimated so that it can
reroute the traffic through the next alive bucket. for this bfd session has
to be established between the the source switch and destination
switch(which are connected to the respective hosts).
 Now i am able to enable bfd for those to switches using ovs-vsctl
commands. i also added flow entries for BFD packets, in the switches that
lie in the path.when a link fails in the path, bfd state of these switches
is changes to 'down' and when the link is up again , it again changes to
'up'. So i thought it supports multi-hop. Is it not so? I am using OVS
2.1.1. Please clarify.

Thanks and Regards,
Padma V

On Tue, Feb 3, 2015 at 11:26 PM, Alex Wang <alexw at nicira.com> wrote:

>
>
> On Sun, Feb 1, 2015 at 8:43 PM, Padma Jayasankar <padmajs80 at gmail.com>
> wrote:
>
>> Hi,
>>   I have to use BFD for failure detection and when i went through some
>> examples the action field for the flow entries were set to 'Normal". Can't
>> we use 'output' action. In that case i have to add two entries (one for
>> each direction). Please claridy
>>
>
>
> The BFD implementation in OVS is mainly used for tunnel link failure
> detection.  You need to have a tunnel port first and then can you enable
> bfd on the tunnel port.  The BFD state machine in OVS will compose/send
> control packets through the tunnel... No OpenFlow rules are involved...
>
> We currently do not support multi-hop bfd.
>
> However, at this time, it is still unclear what kind of link
> (tunnel/point-to-point physical link) you want you monitor... maybe you
> should clarify first,
>
> Thanks,
> Alex Wang,
>
>
>> Thanks and Regards,
>> Padma V
>>
>> _______________________________________________
>> discuss mailing list
>> discuss at openvswitch.org
>> http://openvswitch.org/mailman/listinfo/discuss
>>
>>
>
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