I don`t mean to be the dunce... here but .
why not (and don`t flame me please...)
if you use the " ip ospf cost" command on the interface you ARE going to
manipulate all traffic ....
this is going to cause you probs with A-C ....
IT`s a Doozy kev......i very much wish to find out how your going to get
around this .......
steve
>From: "Kevin Schwantz"
>Reply-To: "Kevin Schwantz"
>To: [EMAIL PROTECTED]
>Subject: Re: Wanna Be a CCIE? Try This One [7:6076]
>Date: Tue, 29 May 2001 12:18:33 -0400
>
>Thats a good point James. Distribution lists are too restrictive and not
>very scalable in this situation. I think my first course of action would be
>to tweak the OSPF cost between A and C so that traffic from A to D will go
>via B instead of C. My only concern is that I might create the situation
>where traffic from A destined for C goes via B !! This would just be
>creating a new problem.
>
>Kevin
>
>""James Haynes"" wrote in message
>[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Wouldn't you still like the route to D to be available through C if the
>link
> > between B and D goes down, or if router B goes down? A distribution list
> > would stop that.
> >
> > --
> > James Haynes
> > Network Architect
> > Cendant IT
> > A+,MCSE,CCNA,CCDA,CCNP,CCDP
> > ""David Chandler"" wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > Have you tried an inboud distribution list on Router A's area 1
> > > interfaces. If router A doesn't learn the Router D routes thru those
> > > interfaces it should then use Area 0.
> > >
> > >
> > > Worth a try.
> > >
> > > DaveC
> > >
> > > Kevin Schwantz wrote:
> > > >
> > > > Thanks for the recommendations. Firstly, let me explain why I need
>the
> > > > routing to behave in such a way. The reasons are purely geographical
>and
> > I
> > > > want to reduce latency. Routers A and B are in London and connected
>back
> > to
> > > > back via FastEth. Routers C and D are in and SanJose and NewYork
> > > > respectively(Connected to both London routers via FR).
> > > > I certaintly won't want traffic originating from RouterA ( London )
> > > destined
> > > > for RouterD (NewYork) to have to go to SanJose first. It would be
>much
> > > > better if the hop is A-B-D instead of A-C-D.
> > > >
> > > > Schwantz
> > > >
> > > > ""EA Louie"" wrote in message
> > > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > > > ... or route-map the router D network(s) to go through Router B at
> > Router
> > > > A
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Chris Larson"
> > > > > To:
> > > > > Sent: Tuesday, May 29, 2001 7:24 AM
> > > > > Subject: RE: Wanna Be a CCIE? Try This One [7:6076]
> > > > >
> > > > >
> > > > > > Place a summary route to null 0 for the networks on Router D on
>your
> > > > OSPF
> > > > > > routers and set the metrics appropriately for the summary route
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
>Behalf
> > Of
> > > > > > Kevin Schwantz
> > > > > > Sent: Tuesday, May 29, 2001 10:03 AM
> > > > > > To: [EMAIL PROTECTED]
> > > > > > Subject: Re: Wanna Be a CCIE? Try This One [7:6076]
> > > > > >
> > > > > >
> > > > > > routerA routerB
> > > > > > AREA0--------AREA0
> > > > > > | |
> > > > > > routerC routerD
> > > > > > AREA1---------AREA1
> > > > > >
> > > > > >
> > > > > > Since we are on the topic of OSPF, could someone help me out on
>the
> > > > > scenario
> > > > > > above?
> > > > > >
> > > > > > Routers A and B have interfaces in Area 0 and Area1. I want
>traffic
> > > > from
> > > > > > routerA destined for routerD to go via router B. This is not the
> > case
> > > in
> > > > > my
> > > > > > network because I realise that routerA prefers Intra-Area
>routes
> > and
> > > > thus
> > > > > > would route traffic to routerD via routerC.
> > > > > > What tweaks must I make in order to force the traffic from
>routerA
> > to
> > > > > > routerD to go via routerB ? Someone suggested building a GRE
>tunnel
> > > > > between
> > > > > > routerA and routerB and then configure the tunnel to be in
>AREA1.
> > > > > >
> > > > > > Any suggestions?
> > > > > >
> > > > > > Kevin
> > > > > >
> > > > > >
> > > > > > ""W. Alan Robertson"" wrote in message
> > > > > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > > > > > Guys,
> > > > > > >
> > > > > > > The actual traffic will not be routed up to area 0... Area 0
>has
> > > been
> > > > > > > extended
> > > > > > > down to R2, so R2 is now a backbone router. R2 has interfaces
>in
> > 3
> > > > > areas
> > > > > > > now:
> > > > > > > Area1, Area2, and Area0 by means of it's virtual link.
> > > > > > >
> > > > > > > Any traffic originating in Area2 destined for Area1 will be
>routed
> > > > > > directly
> > > > > > > by
> > > > > > > R2. This satisfies the "Interarea traffic must traverse the
> > > backbone"
> > > > > > rule,
> > > > > > > because R2 *is* a backbone router.
> > > > > > >
> > > > > > > This is not theory... It is fact.
> > > > > > >
> > > > > > > Alan
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: "Andrew Larkins"
> > > > > > > To:
> > > > > > > Sent: Monday, May 28, 2001 10:13 AM
> > > > > > > Subject: RE: Wanna Be a CCIE? Try This One [7:6076]
> > > > > > >
> > > > > > >
> > > > > > > > agreed....to area 0 then on to the intended area
> > > > > > > >
> > > > > > > > -----Original Message-----
> > > > > > > > From: Circusnuts [mailto:[EMAIL PROTECTED]]
> > > > > > > > Sent: 28 May 2001 15:50
> > > > > > > > To: [EMAIL PROTECTED]
> > > > > > > > Subject: Re: Wanna Be a CCIE? Try This One [7:6076]
> > > > > > > >
> > > > > > > >
> > > > > > > > Chuck- my answer is Yes. The traffic from the Virtual
>Linked
> > > > > psuedo-ABR
> > > > > > > > passes back to Area 0, before it's sent onto the intended
>Area
> > > (even
> > > > > if
> > > > > > > it's
> > > > > > > > directly connected).
> > > > > > > >
> > > > > > > > Phil
> > > > > > > >
> > > > > > > >
> > > > > > > > ----- Original Message -----
> > > > > > > > From: Chuck Larrieu
> > > > > > > > To:
> > > > > > > > Sent: Sunday, May 27, 2001 8:59 PM
> > > > > > > > Subject: Wanna Be a CCIE? Try This One [7:6076]
> > > > > > > >
> > > > > > > >
> > > > > > > > > Ever wonder what the CCIE candidates talk about on the
>CCIE
> > list?
> > > > > > > > >
> > > > > > > > > The following message came through today. I thought the
>bright
> > > > folks
> > > > > > on
> > > > > > > > this
> > > > > > > > > list might be curious, and might want to venture an
>answer.
> > > > > > > > >
> > > > > > > > > Begin original question:
> > > > > > > > >
> > > > > > > > > Guys,
> > > > > > > > >
> > > > > > > > > I wonder if there is anybody who remembers the discussion
>on
> > > > Virtual
> > > > > > > > > Links in OSPF. It was posted some time ago but I can't
>seem
>to
> > > > find
> > > > > > it.
> > > > > > > > >
> > > > > > > > > The scenario was something like this:
> > > > > > > > > ________ _______ _______
> > > > > > > > > |Area 0 | |Area1| |Area2|
> > > > > > > > > | R0 |--| R1 |--| R2 |
> > > > > > > > > |______| |_____| |_____|
> > > > > > > > >
> > > > > > > > > There is a virtual link from area 2 to Area 0 via Area1.
> > Traffic
> > > > > needs
> > > > > > to
> > > > > > > > > get to R1 in Area 1 from R2 in Area 2. Assume that the
>virtual
> > > > link
> > > > > > has
> > > > > > > to
> > > > > > > > > use R1 (To create the V.Link). Does the traffic flow
>passed
>R1
> > > (in
> > > > > > Area
> > > > > > > 1)
> > > > > > > > > to Area 0 and then back to area 1, or does the actual flow
> > just
> > > to
> > > > > R1
> > > > > > > from
> > > > > > > > > R2.
> > > > > > > > >
> > > > > > > > > I cant remember the conclusion, and I cant seem to find it
>on
> > the
> > > > > > > > archives.
> > > > > > > > > Quite interesting issues.
> > > > > > > > >
> > > > > > > > > End of original question
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > Chuck
> > > > > > > > >
> > > > > > > > > One IOS to forward them all.
> > > > > > > > > One IOS to find them.
> > > > > > > > > One IOS to summarize them all
> > > > > > > > > And in the routing table bind them.
> > > > > > > > >
> > > > > > > > > -JRR Chambers-
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