From: David Ankers (d.ankers@xxxxxxxxx)
Date: Mon Feb 12 2001 - 09:55:09 GMT-3
Andy,
Any summarization going on there? :-) Anyway, what about "debug ip ospf spf"
look for "adv rtr" (advertising router :-) in the LSA updates to give you the
router sending out the lsa that causes the spantree calc and also the lsa ID
will give you the route that changed.
Hope it helped a bit?
D.
On Monday 12 February 2001 11:05, ANDY NWEBUBE wrote:
> Hi,
>
> Thanks for the quick response. alot of the routers are not in a broadcast
> media environment (DR/BDR), but run on a point-2-point basis. so it is alot
> tougher.
>
> I noticed that by checking the output of debug ip ospf spf, there are alot
> of updates from the external type 5 LSA's causing only a partial spf
> calculation but they dont cause the router to do complete spf calculations.
>
> they are just leaves added to branches and therefore would not " is
> suppose" cause a full recalculation.
>
> what I am interested in is how do I know who/what is causing the spf
> calculations.
>
> We are not running 300 routers in area 0, we have about that number of
> interfaces in area 0. So one router might have as much as 15 interfaces in
> area 0
>
> Regards
> Andy
>
> >Your DRs and BDRs are only able to send information to routers running SPF
> >where SPF would be ran. If a router learns of a new route and is not the
> >DR/BDR, it sends it to the DR/BDR. The DR/BDR then either changes the
> >routing table and distributes the change to the network or they chuck it.
> >If you are not connected where you have DR/BDRs, that is a lot tougher.
> > As for the amount of routers in your area 0, it should not be that much.
> > Usually it is recommended to have 255 in one area at most. You might
> > also look at ospf debug commands and log when SPF is ran. That could
> > help too.
> >
> >Travis
> >----- Original Message -----
>
> From: "ANDY NWEBUBE" <wizdata@hotmail.com>
>
> >To: <ccielab@groupstudy.com>
> >Sent: Monday, February 12, 2001 1:46 AM
> >Subject: OSPF spf calculations
> >
> > > Guys,
> > >
> > > In a network with more than 300 connected interfaces in AREA 0, how
> >
> >would
> >
> > > you know which interface(s)is actually causing the SPF calculations.
> > >
> > > I have tried looking at the sequence numbers and comparing them with
> > > the age, i.e the higher the sequence number and the lower the age then
> > > the
> >
> >most
> >
> > > likely that it is the culprit. But there are other designed factors
> > > that could affect the age. (MaxAge etc)
> > >
> > > Is there a known way that you could actually track down the interface
> > > or router that the constant updates are emanating from
> > >
> > > Thanks in advance
> > >
> > > Regards
> > > Andy Nwebube
> > > CCNP
> >
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