[ovs-discuss] Interval /transmission timer for particular MPs in CFM

[edward wilson]

First machine-

ovs-appctl cfm/show br0

MPID 1: fault recv_fault

                 Interval: 1000ms

                Next CCM tx: 403ms

                Next fault check: 2744ms



Remote MPID 2: fault

                Recv since check: false



Second machime-

ovs-appctl cfm/show br0

MPID 2: fault recv_fault

                 Interval: 1000ms

                Next CCM tx: 403ms

                Next fault check: 2744ms



Remote MPID 1: fault

                Recv since check: false

-Ed

On Thu, Mar 15, 2012 at 10:12 PM, Ben Pfaff <blp at nicira.com> wrote:

> Maybe you should show us your configuration.  It seems likely that
> there is just some misunderstanding.
>
> On Thu, Mar 15, 2012 at 05:30:19PM +0530, edward wilson wrote:
> > when I am creating cfm between two ovs ( one physical and other VM on
> same
> > machine) , CCM packet are with RDI bit set.
> > connection is not making between MPs.
> > both are on same bradcast domain.
> >
> > tried with two physical machines with OVS by giving same vlan id, but
> > result is same.
> >
> > -ed
> >
> > On Sat, Feb 18, 2012 at 2:27 AM, Ethan Jackson <ethan at nicira.com> wrote:
> >
> > >   > Ed- same broadcast domain , you mean- I have to assign all MPs in
> one
> > > vlan
> > > > or same network should be provided.
> > >
> > > The CFM module sends multicast CCMs on the interface upon which it's
> > > configured.  Presumably, multicast/broadcasts packets egressing this
> > > interface can reach some set of other hosts on the network.  This set
> > > can be restricted by using VLANs or other strategies.  How this is
> > > done precisely, is out of the scope of the CFM module.  The important
> > > thing is, when the CFM module broadcasts CCMs, all other MPs that
> > > these CCMs reach need to have the same transmission interval.
> > >
> > > >> > 2) along with that I want to know how can I see the current timer
> > > value
> > > >> > by
> > > >> > any show command for particular MPids, I didn' tfind any command
> for
> > > >> > this.
> > > >>
> > > >> ovs-appctl cfm/show will give you information about currently
> configured
> > > >> CFM.
> > >
> > > The CFM module doesn't maintain a separate timer for each remote MP.
> > > Instead it maintains one timer that triggers at an interval of 3.5
> > > times the transmission interval.  When the CFM module receives a CCM
> > > from a remote MP, it sets a flag for this remote MP indicating the
> > > reception.   When the timer triggers, any MPs which are not flagged
> > > are considered unreachable and removed.  All of this information (the
> > > timers, the set of reachable MPs, the reception flag) is available
> > > from the ovs-appctl cfm/show command.
> > >
> > > It's also worth noting that we don't implement the full 802.1ag
> > > specification.  We implement a much simplified version which maintains
> > > the packet format, but is quite a bit less sophisticated than the
> > > standard.
> > >
> > > Ethan
> > >
> > >
> > >
> > > >
> > > >
> > > > Ed- this command shows the configured CFM,my doubt was when CCM
> received
> > > > then timer gets restarted then how can I check /verfiy this that
> timer
> > > has
> > > > been restarted for a MP or MPs
> > > >>
> > > >>
> > > >> Ethan
> > > >>
> > > >>
> > > >>
> > > >> >
> > > >> > Regards,
> > > >> > Ed
> > > >> >
> > > >> > _______________________________________________
> > > >> > discuss mailing list
> > > >> > discuss at openvswitch.org
> > > >> > http://openvswitch.org/mailman/listinfo/discuss
> > > >> >
> > > >
> > > >
> > >
>
> > _______________________________________________
> > discuss mailing list
> > discuss at openvswitch.org
> > http://openvswitch.org/mailman/listinfo/discuss
>
>
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