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. Paul Goyette Juniper Networks Customer Service JTAC Senior Escalation Engineer Juniper Security Incident Response Team PGP Key ID 0x53BA7731 Fingerprint: FA29 0E3B 35AF E8AE 6651 0786 F758 55DE 53BA 7731 > -----Original Message----- > From: Phil Mayers [mailto:[email protected]] > Sent: Monday, March 09, 2009 5:00 AM > To: Paul Goyette > Cc: Stefan Fouant; Andrew Jimmy; [email protected] > Subject: Re: [j-nsp] ispf support on Juniper routers > > Paul Goyette wrote: > > Having just recently looked at this area of the code, I can > > confirm that Juniper runs incremental SPF whenever possible > > As I understand it, there are two types of ispf: > > * ISPF where the LSDB changes are type5 LSA i.e. at the > leaves of the > SPF tree, which can be done incrementally. I believe both IOS > and JunOS > do this by default? > > * the "extra" ispf that the Cisco IOS command does, which > applies to > type1/2 LSA changes: > > http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/ospfispf.html > > Does JunOS do both or only the former? > _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
