[Xorp-hackers] Problems migrating a routing protocol...

[Rafael Paoliello Guimaraes]

Hello,

I am currently migrating a routing process to XORP and I am facing some 
problems that I do not know how to solve, so I though that maybe 
somebody could help me... What I did was to change as little as possible 
the original implementation of the routing process. So, what I did is to 
create a thread that is responsible to interfacing between my routing 
process and XORP. It registers the protocol within XORP and keeps the 
eventloop. The only change in the original routing process (besides 
creating this new thread) is in the add/del routes functions. Now, these 
functions send the route to be added/deleted to the new thread through a 
pipe. The thread processes this route and adds or deletes the route in 
XORP by calling the appropriate XRL. In fact, this thread is almost the 
equal to static_routes. The only difference is that it receives routes 
to add/delete from the pipe.

Well, this is what I have done so far and, I think it should work fine, 
but for some reason, it doesn't.

Below you can see the report from the router manager. The first 
occurence is during the registration of the new protocol (do I have to 
change anything in the RIB so that it knows about this new protocol?).

[ 2004/12/15 16:47:09  ERROR xorp_rib:2140 RIB +132 rib.cc 
admin_distance ] Administrative distance of "test" unknown.

Then, when I add a new route (unicast) , it seems to send the XRL 
correctly, but the callback is never called...

                 success = _xrl_rib_client.send_add_interface_route4(
                     _rib_target.c_str(),
                     TestNode::protocol_name(),
                     true /* unicast */,
                     false /* multicast */,
                     test_route.network().get_ipv4net(),
                     test_route.nexthop().get_ipv4(),
                     test_route.ifname(),
                     test_route.vifname(),
                     test_route.metric(),
                     callback(this, 
&XrlTestNode::send_rib_route_change_cb));

Some seconds after this, I get the following report in the router manager:

[ 2004/12/15 16:47:46  ERROR xorp_rtrmgr:2116 FINDER +85 
finder_xrl_queue.hh dispatch_cb ] Sent xrl got response 211 Reply timed out
[ 2004/12/15 16:47:46  ERROR xorp_rtrmgr:2116 FINDER +85 
finder_xrl_queue.hh dispatch_cb ] Sent xrl got response 211 Reply timed out
[ 2004/12/15 16:47:46 INFO xorp_rib RIB ] Received death event for 
protocol test shutting down -------
OriginTable: test
IGP
next table = Redist:test

It seems to me that the RIB tries to call the callback function I have 
sent in the send_add_interface_route4 call, but for some reason it 
times-out. And finally, the router manager thinks that my routing 
protocol died, but in fact it keeps running as nothing has happened. 
Does anybody have any idea of what could be happening? Why the RIB can 
not call the callback function?

Cheers,

-- 

===========================================
  Rafael Paoliello Guimaraes
  PhD Student - Computer Networking Group
  Department of Computer Architecture (DAC)
  Polytechnic University of Catalonia (UPC)
  Phone: +34-934017187   Fax: +34-934017055
  URL: http://people.ac.upc.es/rpaoliel
===========================================