Re: ISP Filter Policies--Effect is what?

[John Fraizer <nanog () Overkill EnterZone Net>]

On Tue, 8 May 2001, Stephen J. Wilcox wrote:

> if you have a /16 why would it be broken down to /24? i would assume the
> only reason you advertise /24 is because that is the size of your
> assignment from the NIC, in which case you cannot advertise the /16.
>
> if you do own the /16 then yes of course you can advertise it.

Stephen, you neglected to look at the big picture.  The "organization" has
the /16 but has sites spread out all over the planet and has assigned
/24's to them.  Additionally, they connect into the global net via diverse
providers.

> <snip>
> Site                    BGP Advertisement       to      ISP
> Amsterdam               169.61.201.0/24         AMSISP
> Austin          169.61.111.0/24         Genuity & Internap
> SanFran         169.61.119.0/24         Genuity & Internap
> Tokyo                   169.61.202.0/24         TOKISP
> Sydney          169.61.156.0/24         SYDISP


---
John Fraizer
EnterZone, Inc