I'd like to replace some Ciscos by OpenBSD machines.
On the routers I have configured the possibility to span networks from our own AS over peerings, Cisco speak: neighbor x.x.x.x allowas-in
This is needed for disjunct networks.
I didn't find a clue how to do this with OpenBGPd - any hints?
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Not currently possible, it will need code changes. Normally this check
is done to prevent route loops. It shouldn't be too hard to naively hack
this type of option into place, but I'm not sure what else might need
to be done to avoid loops.
SOO can be used for loop detection, but only if your bgp peerings don't strip
another dirty hack would be to get the peer to aggregate your 'remote'
prefixes towards you (without as-set) to conceal the ASN. beware that ebgp
routes are prefered over ibgp by default though - this is a gun & and your
feet look tempting.
own AS over peerings, Cisco speak: neighbor x.x.x.x allowas-in
You can work around this by pointing a default at your provider, too.
But it is kind of yucky.
Not sure but I think it should be possible to run an iBGP session between
the two border routers and use "nexthop qualify via bgp". At least that
would be my initial approach if I had such a problem. Just use the
external IP addrs to make the session.
If you don't need dynamic routing to reach the other BGP then you could
even use static routes and skip the "nexthop qualify via bgp".
Thanks a lot for your multiple answers; I'll talk to our Cisco guru in order to see what would be the best solution here.
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