Hi
i don`t mean to be rude but ,for r1 and r3 to get to the ethernet
segment,you will have to go throught rip...??????
>I had originally thought that both of the ASBR's would choose the OSPF
>route
>to the ethernet segment between the 2 routers running only RIP, since the
>routes are identical in mask length,
R4 and R5 are only running rip ...yes.....
so how do you get to the ethernet segment between them Via an ospf path if
the are only running RIP???????
the rip path will be advertised as an OSPF E2 path ..yes...
so there is NO rip path.....there are only OSPF paths...that is what
re-distribution does right...?????
HELP..... i am confused
>What ends up happening is one of the ASBR's uses the OSPF route and the
>other one uses the RIP route, dependancy upon which one comes to full first
>will use the RIP route, and the other one will use the OSPF route.
THERE is no ospf route......R4 and R5 are using RIP ....you can`t get to the
ethernet segment via ospf only rip .....
you can go VIA a Re-distributed route ....but it`s a RIP re-distributed
route not ospf...
what i mean is
the route to r4 and r5 is re-dis into ospf via rip ....
r2 wants to get to the ether-link ...
it uses the re-dist rip route andvertised via ospf...
yes it`s an ospf route BUT it came from RIP..
so what do you mean ...?????
i thought i knew OSPF but you have confused me totally..
if i need help understanding this please help
steve(.............me nogggin`s gone all soft,Guv)
>From: "Brian Lodwick"
>Reply-To: "Brian Lodwick"
>To: [EMAIL PROTECTED]
>Subject: OSPF scenario [7:7605]
>Date: Thu, 7 Jun 2001 17:17:54 -0400
>
>I've come across a wierd OSPF issue in a lab scenario I thought might be
>fun
>for everyone to comment on (instead of a bunch of gossip on salaries and
>brain dumps)
>
>The scenario has 5 routers (NLI-lab 7) and the last thing I want to do is
>upset NLI by divulging their lab scenario so I'll try to briefly go over
>what I thought was interesting without divulging the whole thing.
>
>There are 3 routers running OSPF on the top. 2 of the 3 have OSPF on one
>serial interface and RIP on the other serial interface -fully
>redistributing
>both ways. On the bottom there are 2 routers running RIP on their serial
>interfaces (which are connected to the RIP serials on the redistributing
>routers) then those 2 bottom RIP only routers are connected together via an
>ethernet segment which are both running RIP on the ethernets as well.
>
>r1 --- r2 --- r3
>| |
>| |
>r4 --------- r5
>
>I believe the two redistributing routers would be considered ASBR's in
>OSPF.
>I had originally thought that both of the ASBR's would choose the OSPF
>route
>to the ethernet segment between the 2 routers running only RIP, since the
>routes are identical in mask length, the next thing is to look at the
>administrative distance. Since OSPF has is lower it should choose the OSPF
>route, but if they both use the OSPF route you would obviosly create a
>routing loop, which cannot happen in OSPF since it creates a topological
>database.
>What ends up happening is one of the ASBR's uses the OSPF route and the
>other one uses the RIP route, dependancy upon which one comes to full first
>will use the RIP route, and the other one will use the OSPF route.
>It seems OSPF will only allow one external exit point for each outside
>subnet. But why don't both of the ASBR's choose the RIP routes and equal
>cost load balance out of the external links as it does internally?
>I think it's a neat scenario. I really liked it, the overall issue was to
>learn how to control the routing process to most efficiently route to the
>destination, but I learned alot about the way OSPF works too.
>
> >>>Brian
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