[c-nsp] Growing BGP tables

[David J. Hughes]

On 01/12/2004, at 11:59 PM, lee.e.rian at census.gov wrote:

> Say RouterA advertises a /16 and a /24 within the /16 to ISPA, RouterB
> advertises the same /16 and a different /24 within the /16 to ISPB.
>
> If I'm understanding the proposal correctly, ISPA drops the /24 since 
> it
> has the same next hop as the /16.  ISPB also drops their /24 since it 
> has
> the same next hop as the /16.  If the link between RouterA and RouterB 
> goes
> down then ISPA, and all their customers, aren't going to be able to 
> get to
> siteB (the /24 advertised by RouterB) while ISPB, and all their 
> customers,
> aren't going to be able to get to siteA (the /24 advertised by 
> RouterA).


But isn't this a basic problem of an under engineered and poorly 
designed network?  If I designed a network that relied solely on a pair 
of loosely connected transit providers as my backup link between 
important sites within the same AS, well, I wouldn't think I'd done a 
good job.


David
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