On Mon, Apr 09, 2007 at 02:03:21PM -0400, Frangois Rousseau wrote: > Hi Claudio, > > I have double check on my lab and everything work fine for the OSPF > part, sorry for my mistake. > > But at the end, I'm still having the same problem: the server didn't > know the right route. > > OSPF see all the route correctly but the system didn't seem to be > updated. If I do "route show" I only see the local route pointing > directly to the CARP device instead of pointing to the other router. > > route show give me something like this when my cable is unplug from > the "carp" interface: > 83.201.77/24 link#10 UC 0 0 - carp1 > > What do you think it can be? >
ospfd will never overwrite already present routes (unless they have came from bgpd). So the carp route can not be changed. AFAIK you only get such a network if you are using a unnumbered parent device. Could you try to give the parent interface an IP address out of 83.201.77/24 -- this should change the link local route to this network to the real interface. This will solve the problem in case the box is BACKUP. There is still a problem when you unplug the network. In this case packets hitting that box will get dropped. This can only be fixed if the kernel is able to change the RTF_UP flag depending on the link state. -- :wq Claudio > > > 2007/4/7, Claudio Jeker <[EMAIL PROTECTED]>: > >On Sat, Apr 07, 2007 at 12:21:19PM -0400, Frangois Rousseau wrote: > >> But how I'm suppose to annonce the route for the right carp interface? > >> Right now my servers can always reach the router because of the CARP > >> interface but the router can't always reach the servers... > >> > >> If I unplug the cable of my CARP interface (bge2 for example), all > >> traffic from this router (directly from him or from my upstream > >> provider) can't reach the servers because the router still have only 1 > >> route going directly to his bge2 interface (the interface with carp) > >> and he have no clue of the MASTER interface. > >> > >> Maybe I'm worng and OSPF is not the solution. > >> > >> What I try to do is to have a redundant gateway for my servers (CARP) > >> and I want to have 2 upstreams provider with BGP (multihoming) > >> > >> I need a way for this 2 routers to talk to each other and share their > >> internal routes to know how to reach both of the "exit" point (route > >> to both upstream provider) and how to reach the MASTER interface of > >> every CARP group. > >> > >> Any idea? > >> > > > >If you are just running with two routers you don't need to use OSPF. > >Use CARP for the inside network, setup the upstream sessions on each > >router (perhaps even using "depend on carp" to fail over the sessions) and > >setup a IBGP session between the two routers -- best via a dedicated > >interface. Set "set nexthop self" on the IBGP sessions and you should be > >fine. > > > >-- > >:wq Claudio
