Re: [isp-bgp] splitting the network and BGP

[Rob Genovesi <rob@...>]

Thanks for the feedback...

I plan to only advertise my networks via one ISP (so I'll be announcing 
ISP-A and ISP-B networks via one ISP) for a short time until a new 
connection can be established between the sites again (probably take a few 
weeks).... then things will be back to "normal" again.

I'll check with my ISP on the aggregates...


Thanks again,

        Rob


At 10:58 AM 12/23/2004 -0500, you wrote:
> Rob Genovesi wrote:
>
> > My question is, what happens if/when I severe the conneciton between the 
> > two sites?  Can SITE-B still advertise networks that are provided from 
> > ISP-1 and vice-versa?  Can the two sites still use the same (public) ASN 
> > even though there is no direct connection between the two?
> Theoretically, the two sites have unique routing policies and should use 
> different ASN, but it should work with one.  Just make sure you can split 
> the announcements, or sites could end up blackholing traffic intended for 
> the other.  You might consider a GRE tunnel between the sites if you have 
> a small amount of overlap, but that could introduce some problems of its own.
>
> > We have IP network blocks assigned by ISP-1 but I want to use them 
> > primarily at SITE-B where there is no direct connection to ISP-1.
> ISP-1 shouldn't care as long as you still have a connection to ISP-1. 
> However, you might have problems if your address space is covered under a 
> shorter aggregate from ISP-1 and you don't have connectivity between them.
>
> pt



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