Single AS Number for multiple prefixes in different country

Joel Jaeggli joelja at bogus.com
Sat Jan 15 14:00:32 CST 2011


On 1/15/11 8:51 PM, Graham Wooden wrote:
> Not to budge in here ... but I have always been curious of this type of
> setup, as in all my past BGP deployments its always been that all edges
> belong in the same ibgp peering group.
> 
> Ryan, does the other edge(s) get confused when they see their same AS number
> in the path upon route determination from traffic sourced from another edge?

you just need to defeat loop detection, which you can do on most any
router.

on junos it's nr_loops 2

> Or are you doing some sort of BGP Confederation?
> 
> I am progressing down the path (no pun intended) of deploying another edge
> in another location from which that 'remote' location will have it's own
> subnets to announce.  But if I have a requirement not necessary having to
> announce the other subnets, I don't need to an expensive L2 back-haul
> between the two and do what is discussed here, no?
> 
> -graham
> 
> 
> 
> On 1/15/11 12:34 PM, "Ryan Finnesey" <ryan.finnesey at HarrierInvestments.com>
> wrote:
> 
>> We are doing this now and it is working well
>>
>> -----Original Message-----
>> From: Harris Hui [mailto:harris.hui at gmail.com]
>> Sent: Friday, January 14, 2011 4:59 AM
>> To: nanog at nanog.org
>> Subject: Single AS Number for multiple prefixes in different country
>>
>> Hi,
>>
>> 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?
>>
>> Please advise.
>>
>> Thanks
>> Harris :-)
>>
> 
> 
> 





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