Hello. There are users out there who do desperately want multipath routing support in Bird. Please don't just ignore the need for multipath.
Regards, Andy. Securepoint user. -----Original Message----- From: owner-bird-us...@atrey.karlin.mff.cuni.cz [mailto:owner-bird-us...@atrey.karlin.mff.cuni.cz] On Behalf Of Joakim Tjernlund Sent: 26 April 2010 00:05 To: Ondrej Zajicek Cc: bird-us...@trubka.network.cz Subject: Re: OSPF performance/SPF calculations Ondrej Zajicek <santi...@crfreenet.org> wrote on 2010/04/25 23:20:33: > > On Sun, Apr 25, 2010 at 06:08:04PM +0200, Joakim Tjernlund wrote: > > > This is not a problem because both SPF and calc_next_hop() chooses the > > > cheapest (full) ptp link. They both uses the same (local) metrics. > > > > Our ptp links typically have the same cost between the same two routers so > > it is not unlikely that the link will be asymentric I think. However I > > don't think that will be a problem anymore as BIRD don't use/support > > equal cost multipath, right? > > Yes. > > > Right, how about these statements from RFC 2328: > ... > > These talk about inheriting ALL next hops from the parent and I don't > > see the BIRD does that. Looks like BIRD just selects one next hop > > from its parent? > > Assuming it is, does that impose any restricts? > > Yes, BIRD chooses one next hop. Because BIRD does not implement equal > cost multipath, this is not a problem. > > > Some other random questions: > > > > One think I always wanted is the possibility to add an host IP address to > > all areas, in my case I like to export the routers primary IP address > > to all areas so the router can always be reached. Is that possible with > > BIRD? > > You can use 'stubnet' option to add 'virtual' stub network (in that case > /32 stub) to the router-LSA. You can add this option to each area > config to get this in each area. That sounds exactly as what I need, thanks. > > Or add /32 stub network to one area, other areas get a summary-LSA > with that address. > > > If you pull the cable to an ethernet I/F that is currently in a OSPF > > domain, do BIRD delete the whole subnet from the R-LSA or do you > > leave a host route with the I/F's IP address in the R-LSA? > > BIRD does not use link availability information, therefore if you pull > the cable, BIRD keeps the whole subnet in the router-LSA (if it is > a stub network). If you do(any plans?), my vote is to leave a host stub in the R-LSA as it may very well be possible to reach that IP address over another link. Jocke Monitor Computer Systems Limited Company Registration Number: NI 17805 Registered Office: 3 Pine Crest, Holywood, North Down, Northern Ireland BT18 9ED