Re: Policy Statement on Address Space Allocations

[Dave Siegel <dsiegel () rtd com>]

> > > Currently I have 2 choices as
> > > far as I can make out, give them a bit of my /19, break up my
> > > nice aggregate and ensure loads of extra announcements (and that
> > > probably none of them get routed by anyone applying prefix based
> > > filtering), or give them a new /19 all of their own (you've
>
> Suppose you have a customer that needs a /22 and they want to go 
> multi-homed. Suppose you give them that /22 out of your /19 or /16 you 
> got from the RIPE NCC. So they announce their /22 to you and to their 
> other provider. But you keep announcing your /19 or /16. So if anybody 
> were to filter the /22 announcement, your customer only suffers partial 
> loss of connectivity, since you are still announcing an aggregate of 
> their announcemnt (your original /19 or /16).
>
> Problem fixed. Anything else?  ;-)

Yes, if you go down, or their line goes down to you, their multi-homing is
worthless.

Dave


-- 
Dave Siegel                  President, RTD Systems & Networking, Inc.
(520)623-9663                Network Engineer -- Regional/National NSPs (Cisco)
dsiegel () rtd com                   User Tracking & Acctg -- "Written by an ISP, 
http://www.rtd.com/~dsiegel/                                    for an ISP."