RE: OSPF Path selection question

Thanks Ronnie;

  But the path the router is taking is having the higher cost I mean it's not
the shortest path, It looks intra is preferred over the inter anyway regarding
the cost, Is there a way to disable this feature from OSPF itself, I mean if i
have a limitation stops me to install a new link in OSPF AREA 1, and i want to
take Area 0 path for traffic symmetry reasons, Can i do this from the OSPF
itself without adding new links, thanks

> Date: Sat, 20 Mar 2010 19:16:47 -0400
> Subject: Re: OSPF Path selection question
> From: ronnie.angello_at_gmail.com
> To: mohamed_kamar_at_hotmail.com
> CC: ccielab_at_groupstudy.com
>
> Yes, it's expected if I understand your topology correctly. See rule
> #3. You can get creative and change the behavior. Change the link
> between R5 and R4 to area 1 or add a link between R5 and R2. That
> type of thing...
>
> On Sat, Mar 20, 2010 at 7:00 PM, mohamed kamar
> <mohamed_kamar_at_hotmail.com> wrote:
> >
> >
> > Thanks Ronnie;
> > The case here that it's taking area 1 path anyway regardless the cost, is
> > it expected?, If yes, how to overcome this ? Thanks
> >
> >> Date: Sat, 20 Mar 2010 18:53:11 -0400
> >> Subject: Re: OSPF Path selection question
> >> From: ronnie.angello_at_gmail.com
> >> To: mohamed_kamar_at_hotmail.com
> >> CC: ccielab_at_groupstudy.com
> >>
> >> Metrics aside, consider OSPF path selection rules -
> >>
> >> 1) Take shortest path to area 0
> >> 2) Take shortest path through area 0 without going through a non-zero
area
> >> 3) Take shortest path to destination without going through area 0
> >>
> >> Thanks,
> >> Ronnie
> >>
> >> On Sat, Mar 20, 2010 at 6:25 PM, mohamed kamar
> >> <mohamed_kamar_at_hotmail.com> wrote:
> >> > Hi Friends;
> >> >
> >> > Any one has idea what's going on in the below?
> >> >
> >> >
> >> > R1
> >> >
> >> > | (BGP)
> >> >
> >> > |------------------------|
> >> >
> >> > R3---------------------R2
> >> >
> >> > | OSPF Area1 |
> >> >
> >> > R5-------------------- R4
> >> >
> >> > OSPF Area 0
> >> >
> >> >
> >> >
> >> >
> >> > -R1 is running BGP with R2 and R3
> >> >
> >> > -R2 is primary router So it's redistribute BGP into OSPF metric 100
type
> >> > E1
> >> >
> >> > -R3 is Secondry router So it's redistribute BGP into OSPF metric 200
> >> > type E1
> >> >
> >> >
> >> > The problem is R5 always using R3 path to reach R1 however the metric
of
> >> > this
> >> > path is higher than the one coming from R4, Any Idea, Thanks
> >> >
> >> >
> >> > Best Regards;
> >> >
> >> > M.Kamar
> >> >
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Received on Sun Mar 21 2010 - 07:29:35 ART