On Tue, Dec 06, 2011 at 10:06:30AM -0500, [email protected] wrote: > I tried modifying the example. Here is the situation.
> No clients, just have my own block of IPs I want to announce > (A.A.A.A/22). I also have two /29s, one from each provider (Y.Y.Y.A/29, > Y.Y.Y.B/29) that contains the external IP address for each of my > router's two ethernet interfaces, as assigned by each ISP. The two > providers I'm trying to just run so one is preferred, but both can be > used. The asymetric isn't a huge deal, so if it's simpler to take it > out, that's ok also. In that case i would suggest to forget multiple routing table and keep it simple, like in: https://git.nic.cz/redmine/projects/bird/wiki/BGP_example_2 (or the later filtering example) (and just insert several your ASNs to AS path in export filter to less preferred uplink) > Also, besides the bird setup, I ran the following rules: > ip rule add iif eth2 table 1 > ip rule add iif eth5 table 2 > (This is on Ubuntu, btw, and my two ISP interfaces are eth2 (my less prefered > one) and eth5 (my high speed 10 Gig fiber one). I thought you want to using multiple routing tables to route your traffic from your two internal links. There is no reason to route differently traffic received from each uplink. > The problems / questions I ran into was this. > > 1) Does the table 1 / table 2 need to be declared in the underlying system > first? I didn't think so, like in /etc/iproute2/rt_tables? Because the IP > rules seemed to work for pinging out on the interface. No > 3) Is the ospf part needed or helpful? If you use OSPF in your network, then yes, otherwise no. But your OSPF config seems to be completely pointless. I would suggest to read some general texts about OSPF, BGP and routing. > Is it a good practice to have the BGP router also run OSPF, in general? I think it is, unless in trivial cases. But in most cases you do not have OSPF session with your provider. -- Elen sila lumenn' omentielvo Ondrej 'SanTiago' Zajicek (email: [email protected]) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."
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