From: WorkerBee (ciscobee@gmail.com)
Date: Thu Mar 08 2007 - 22:51:11 ART
This is normal, you are running a FR multipoint network.
Imagine this is a LAN, R3 advertisement to R2 for R1's routes
will not modify the next hop since R3 being the hub will think
that R2 can reach R1 in a single hop rather than via R1.
The only way to change this behaviour is to change the
ospf network type to --> "point-to-multipoint", hence R1 and R2
will learn each other routes using R3 as the next hop and
hence resolve any potential routing issue.
On 3/9/07, achievewoo@gmail.com <achievewoo@gmail.com> wrote:
> Hi,everyone
> There is a case. R1&R2&R3 are running ospf(area 0) in frame-realy network.
>
>
> R1--------------------------R2
> |
> |
> |
> |
> |
> R3
>
> As diagram shows, R3 play roles as hub using subinterface multipoint. R1 and R2 are spokes. R1's loopback interface 0 (IP add 100.100.100.1)is advertised in OSPF area.
> R1: S0/0 1.1.123.1 lo0 100.100.100.1
> R2: S0/0 1.1.123.2
> R3: s0/0.123 1.1.123.3
>
> On R2's routing table, there is one route
>
> O 100.100.100.1/32 [110/65] via 1.1.123.1, 01:39:34, Serial0/0
> From this route, R2's next hop is R1 (1.1.123.1). However, When I use traceroute command, the traffic, actually, go through R3 firstly, then R1.
>
> Is it normal?
> Is possible to change that route to:
> O 100.100.100.1/32 [110/65] via 1.1.123.3, 01:39:34, Serial0/0
>
>
>
> Thanks!
>
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