[Xorp-users] Xorp starting problem

[Ben Greear]

On 08/16/2010 10:44 AM, Luca Belforte wrote:
> Ok for ECMP i have found nothing.
>
> In fact i only configured a network with 8 routers, realy simple only
> OSPF and using Linux forwarding.
>
> the topology is as following (sorry for the poor draw)
>
> R1 -------------------------- R2
> |      \                       /  |
> |        R5-----------R6      |
> |          |   \      /   |       |
> |          |      X      |       |
> |          |   /      \   |       |
> |        R7-----------R8      |
> |     /                       \   |
> R3----------------------------R4
>
> So basically two square, and each edge is connected with the same edge
> in the other square. All costs are 1.
> If i want to ping from R4 the interface on R5 facing R1 i have 3
> possible path: R4 - R2 - R1 or R4 - R8 - R5  or R4 - R3 - R1  all costs
> 3. In this case ping doesn't work from R4. If put down one link, example
> R4 to R8, only two will remain, and in this case i can ping the interface.
>
> If i do not put down the link all the routers excepted for R4 can ping
> the interface R5-R1.
>
> I hope is a little bit clear.

Yes, thanks.  This should work with normal OSPF as far as I can
tell.

To debug, you will probably need to investigate each router in the
path and check to see which one has improper routes.  Traceroute might
be a quick way to get started on this.

Then, check the xorp neighbors and other info to see which router
is broken.  Maybe it's a config issue..or maybe a bug.

Plz let us know which version(s) of xorp are you using when
finding this problem.  I can only help with potential coding bugs
if you are using xorp.ct.

Thanks,
Ben

-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com