[c-nsp] BGP across continents

[Alasdair McWilliam]

Hello,

I did think about GRE tunnels but GRE would still need to know about  
the tunnel destination interfaces. I guess I could get around that by  
using the IP address of the ISP interfaces on the border routers, but  
each router will have a link to 2 upstreams, so I'd have to look at  
that from a resilience perspective.

Our border routers are ASR 1002 + ESP5, both will have GE interfaces  
to two providers (4 links, 2 providers). I'm also expecting about  
10Mbps consistently between Europe and Canada even without any  
customer being in "disaster" mode. Any indication of how the ASR1002 +  
ESP5 will handle this? (I've not actually got my hands on an ASR yet  
so am not too sure how they will fare. However from the white papers  
I've read and from what others have said I'm quite hopeful they will  
last for years to come! ;)

Provider wise, Canada and Europe will not share the same providers at  
all. I'm personally thinking of going with two ASNs to keep it  
completely clean, but need to look at the commercials around that from  
a RIPE/ARIN perspective.

Thanks very much
Alasdair


On 7 Apr 2009, at 18:50, Scott Granados wrote:

> There's the allow AS option or you could set up GRE tunnels between  
> sites and build a mesh.  If you use the same carrier in both  
> locations you could use the no-export option and play with more  
> specifics / traffic engineering on that level as well.  Remember  
> though if you start pushing to much traffic over the GRE you're  
> likely to have CPU load issues.  (depending on hardware)
>
>
> ----- Original Message ----- From: "Alasdair McWilliam" <alasdairm at gmail.com 
> >
> To: <cisco-nsp at puck.nether.net>
> Sent: Tuesday, April 07, 2009 7:22 AM
> Subject: [c-nsp] BGP across continents
>
>
>> Hi,
>>
>> I am setting up a multihomed hosting centre in Europe. As part of the
>> service offered we will be providing Disaster Recovery services,  
>> using
>> our ability to re-route customer IP prefixes, through to another
>> hosting centre in Canada.
>>
>> We have a requirement for some prefixes within our net block to  
>> always
>> be available in Canada, and some to always be available in Europe.  
>> So,
>> I am wondering if someone can clarify my thoughts re. the AS numbers
>> required for this: can I use the same ASN at both locations (both of
>> which will have different upstreams) or will they reject prefixes  
>> from
>> one another? For example, Canada will see a prefix from Europe with
>> the same ASN in the AS-Path and drop it. Likewise Europe will drop
>> Canada prefixes because it can see the same AS in the AS-Path.
>>
>> Is there any way around this or is the only option to request a  
>> second ASN?
>>
>> Cheers
>> Alasdair
>> _______________________________________________
>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>