On Mon, Feb 9, 2015 at 6:26 AM, Padma Jayasankar <padmaj...@gmail.com> wrote:
> 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. > No, it does not support multi-hop. If the intermediate switches just forward using flows and do not decrement the ttl, then, it could work but it is not really multi-hop. When you have intermediate vendor routers, the ttl of the udp packets will change. In ovs bfd implementation, the received udp packet must have TTL=255. Thanks, Alex Wang, > Thanks and Regards, > Padma V > > On Tue, Feb 3, 2015 at 11:26 PM, Alex Wang <al...@nicira.com> wrote: > >> >> >> On Sun, Feb 1, 2015 at 8:43 PM, Padma Jayasankar <padmaj...@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@openvswitch.org >>> http://openvswitch.org/mailman/listinfo/discuss >>> >>> >> >
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