[Olsr-users] Slow reaction to change in bitrate/signal changes

[Wolfgang Nagele]

Part of the message missing at the end?

Cheers,
Wolfgang
On Sat, Aug 18, 2018 at 5:02 PM Henning Rogge <(spam-protected)> wrote:
>
> On Sat, Aug 18, 2018 at 8:02 AM Wolfgang Nagele <(spam-protected)> wrote:
> >
> > Hi,
> >
> > I've been testing a setup with two VMs. Both of them running two Layer
> > 2 links (IPv6 only) to each other. Very straight forward. To simulate
> > a link quickly dropping in quality I used the telnet Plugin to set the
> > rx_bitrate and tx_bitrate parameters.
> >
> > I noticed however that this takes about 30 seconds to take effect and
> > traffic switching to the other link. This is *much* longer than I
> > would expect for OLSR to react to a link quality change. Are there
> > config parameters that should be adjusted here? Changing the
> > hello_interval down to 0.1 reduces this time to about 5 seconds -
> > which is much better but still fairly slow.
>
> Typically the ff_dat metric averages the frame loss estimation over 32
> hello-intervals (which is a compile-time constant).
>
> This is because the loss of a few hellos could both mean a bad link or
> just bad luck.
>
> In larger networks the TC interval also plays an important roll to
> transport the link-metric change to the rest of the network.
>
> Which means