From: ANDY NWEBUBE (wizdata@xxxxxxxxxxx)
Date: Mon Feb 12 2001 - 08:05:08 GMT-3
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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