Re: Single AS Number for multiple prefixes in different country

[Bogdan <shoshon () shoshon ro>]

On 14.01.2011 12:06, Patrick W. Gilmore wrote:
> On Jan 14, 2011, at 4:58 AM, Harris Hui wrote:
>
> > We have an AS Number AS2XXXX and have 2 /24 subnets belongs to this AS
> > Number. It is using in US and peering with US Service Providers now.
> >
> > We are going to deploy another site in Asia, can we use the same AS Number
> > AS2XXXX and have 2 other /24 subnets and peering with other Asia Service
> > Providers?
> >
> > Will it affect the routing or BGP Path of our existing subnets in US?
>
> It will not.  There was a thread on this a short while ago, check the archives.
>
> The big question is whether the two sites will be able to talk to each other.  There are ways to make that happen, 
> but by default, a router in asXXXX will not accept eBGP announcements which include asXXXX (loop detection).

allowas-in will do the trick