Receiving routes with own AS?

[Tom van Leeuwen]

I found this: 
http://www.mail-archive.com/bird-users@atrey.karlin.mff.cuni.cz/msg00929.html 
for howto enable allowas-in functionality.
I found this: 
http://www.mail-archive.com/bird-users@atrey.karlin.mff.cuni.cz/msg01295.html 
for backup.
Pointing a default route to a provider.

I think I'll go for iBGP + default route.

Having a customized bird and disabling loop avoidance mechanisms don't 
sound like wise things to do.

tyvm!

~tvl

On 06/24/2012 10:39 PM, Timo Schoeler wrote:
> On 06/24/2012 10:36 PM, Tom van Leeuwen wrote:
>> That sounds very logical. The only way around this is iBGP or a new
>> AS number?
> Cisco-speak is 'allow-as in' for this. I don't know if they use some
> more sophisticated logic to prevent loops, though. What I did see during
> the last months was that OpenBSD's bgpd also didn't (or still doesn't?)
> provide this feature, but can be patched. People asked for it (no link
> handy right now). quagga also supports it, so there is source code
> available to see how to tweak bird, I guess.
>
> HTH,
>
> Timo
>
>> ~tvl
>>
>> On 06/24/2012 09:59 PM, Martin Kraus wrote:
>>> On Sun, Jun 24, 2012 at 07:17:58PM +0200, Tom van Leeuwen wrote:
>>>> Hi guys,
>>>>
>>>> We have a new location and have installed a bgp server with
>>>> bird. We are already using our AS and bird at the main site, but
>>>> want to use that one as well on the second site.
>>>>
>>>> I'm not sure if I want/need to run iBGP, but if I had and the
>>>> link would fail, I should have at least a route through IPT to
>>>> our main site.
>>>>
>>>> I'm already connected through IPT at our new site, but I'm not
>>>> getting any routes for our subnets that are being announced at
>>>> our main site. Our upstream provider says that they are not
>>>> filtering the routes and that it should be my configuration that
>>>> is filtering them. Well, I have 'import all' so that should not
>>>> be the problem. Does bird have some built in logic that does not
>>>> accept routes with my own AS? Or is the IPT incorrect?
>>> BGP filters out routes which have it's AS in the AS path as a loop
>>>   prevention. This is a feature of BGP.
>>>
>>> mk