[j-nsp] ispf support on Juniper routers

Phil Mayers p.mayers at imperial.ac.uk
Mon Mar 9 08:56:10 EDT 2009

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!


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