[Xorp-users] Re: help establishing OSPF adjacencies

Pavlin Radoslavov pavlin@icir.org
Mon, 17 Oct 2005 19:25:59 -0700


> On Mon, Oct 17, 2005 at 02:11:25PM -0700, Atanu Ghosh wrote:
> > The messages of the form '[ 4251 +430 xrl_io.cc ...' are debugging
> > output from OSPF. One of the things that they show are packets being
> > sent and received by OSPF.
> > 
> > OSPF uses multicast on broadcast media to distribute LSAs (with a TTL of
> > 1), so this behaviour is correct.
> 
> I'm wondering how I can debug connectivity to membership in the
> multicast group 224.0.0.5, to where the LSAs are being sent?  ping
> doesn't seem to work, for example.

First, can you confirm whether you still have the same problem even
without using Click?

I'd recommend to check whether there are any firewall rules in your
kernel that may be preventing you from receiving the traffic (e.g.,
rules that throw away the multicast packets, etc).

To debug the problem you can try to use the nemesis-ospf program
from the Nemesis project (http://nemesis.sourceforge.net/).
You can use that program to generate your own OSPF packets.

> > The TRACE messages are typically at the top of methods so they show the
> > state on entry to the method. It is therefore correct that when a
> > InterFaceUp event occurs that the state of the interface was down.
> > 
> > Could you try disabling Click and see if an adjacency is still not
> > formed.
> 
> I disabled click.  The only thing I have in the fea is :
> 
> fea {
>     unicast-forwarding4 {
>             disable: true
>     }
> }
> 
> should the fea have something else?

You don't need anything else in the fea, but "disable: true" should
be "disable: false".


Pavlin