BCP for multisite multihoming

[Leo Vegoda]

On 21 May 2007, at 4:26pm, Kevin Day wrote:

[...]

> Or forget the fact that they're in separate companies, pretend it's  
> one company within the US that has a dozen branch offices within  
> the US. Or a hosting/colo/access company with cages in a dozen  
> datacenters. Or.. whatever. :)

[...]

> Having an entire /32 per POP is tremendous overkill. And, it's  
> still using just as many routes as if this company could just  
> deaggregate the prefix it received. I'm also assuming that  
> additional prefixes aren't going to be free, which is going to  
> further add to the operating expenses of v6 over v4. It also means  
> the company isn't able to tailor its space usage to each POP.
>
> Is one allocation/assignment per site really scalable?

No. One prefix per site doesn't scale. Yes, a /32 is far more than  
many sites will need.

The first requires a new, scalable approach to routing and the latter  
can be solved by changing the minimum allocation size. The latter is  
relatively easy.

Leo