Single AS Number for multiple prefixes in different country

Bogdan shoshon at
Fri Jan 14 05:33:48 CST 2011

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

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