Okay, based on all of the information, we can come up with a solution.
Scenario:
4 routers connected in a ring by various speed links
Objectives:
Router A's traffic for Router C should be sent directly to C
Router B's traffic for Router D should be sent directly to D
Router A's Traffic for B or D should be sent to RouterB
Router B's Traffic for C or A should be sent to RouterB
OSPF should be configured in such a way as to allow the network to maintain
reachability in the event of any single link failure.
Do as little configuration as possible
Scenario Solution:
See Drawing 1
http://www.miscenterprises.com/schwantz.gif
Meets all of the requirements except for the "Do as little work as possible"
because you have to manually configure the cost of every link...
Anyway, you give the FastEthernet Link a low cost, and give the San
Jose-NewYork link a high cost, but not so high that it causes traffic from D
to C to go D-B-A-C.
If I missed any of the objectives, let me know and I'll wiggle the numbers
around to make it work.
-Ejay
-----Original Message-----
From: Kevin Schwantz [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, May 29, 2001 11:38 AM
To: [EMAIL PROTECTED]
Subject: Re: Wanna Be a CCIE? Try This One [7:6076]
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-
> > > > > FAQ, list archives, and subscription info:
> > > > http://www.groupstudy.com/list/cisco.html
> > > > > Report misconduct and Nondisclosure violations to
> [EMAIL PROTECTED]
> > > > FAQ, list archives, and subscription info:
> > > > http://www.groupstudy.com/list/cisco.html
> > > > Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
> > > > FAQ, list archives, and subscription info:
> > > http://www.groupstudy.com/list/cisco.html
> > > > Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
> > > FAQ, list archives, and subscription info:
> > http://www.groupstudy.com/list/cisco.html
> > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> > FAQ, list archives, and subscription info:
> > http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> > FAQ, list archives, and subscription info:
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> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> FAQ, list archives, and subscription info:
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> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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