[c-nsp] OSPF per-prefix LFA

[Oliver Boehmer (oboehmer)]

>
>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).

erm, actually there is "loop-free" AND "microloop free".. two different
properties. LFA targets the former, by sending packets over a repair path
which is loop-free. You can enhance this to also avoid microloops too
while the network converges, but they are different things.. Haven't
looked at the details lately, though..

	oli