[c-nsp] OSPF per-prefix LFA

[Gert Doering]

Hi,

On Thu, May 28, 2015 at 04:06:43PM +0300, George Giannousopoulos wrote:
> As you have probably already noticed, after OSPF timers tuning, the
> convergence is quite fast even without the LFA.. So why would you bother to
> configure LFA in the fiirst place?

The interesting bits are in the two letters "L" and "F" here.

Link-state protocol convergence will cause microloops, LFA avoids those
(if possible in the topology given).

[..]
> As I see it, the requirement for IGP tuning in order to make LFA work as
> expected is somewhat "illegal".. If anyone else can explain that, I'd be
> glad to hear..

Indeed, OSPF tuning - while good general practice - should not be necessary
to make LFA works.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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