[j-nsp] ispf support on Juniper routers

[Chris Whyte]

As just a side note... What's interesting about this so-called feature is
that it gives people the impression that it an important one in order to
achieve "fast" convergence yet spf calculation times are relatively
negligible (even in large networks). If fast convergence is important to you
then the time to update the forwarding table is where people should be
focusing their effort, imho. This is the true bottleneck. More specifically,
features that involve the pre-installment of backup next-hops for example.

Thanks, Chris


On 3/9/09 4:56 AM, "Phil Mayers" <p.mayers at imperial.ac.uk> wrote:

> Paul Goyette wrote:
>> JUNOS will perform ONLY external route recalculation if a
>> Exzternal (Type-5) or NSSA (Type-7) LSA changes.
>> 
>> JUNOS will perform ONLY inter-area and external route
>> recalculation if a Network Summary (Type-3) LSA changes,
>> AND the area from which the LSA originates is NOT known
>> to be a virtual-link transit area.
>> 
>> JUNOS will perform a full SPF for intra- and inter-area
>> routes as well as externals for all other LSA changes.
>> 
>> JUNOS does not have Incremental SPF (for intra-area SPF);
>> if JUNOS needs to run SPF for intra-area routes, it runs
>> a full SPF.
> 
> An extremely comprehensive answer! Thanks for taking the time!
> 
> Cheers,
> Phil
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