On Mon, 15 Jul 2002, Richard A Steenbergen wrote:
On Mon, Jul 15, 2002 at 05:10:28PM -0400, Ralph Doncaster wrote:
Announcing a covering /20 along with the regional more specifics I have will only serve to increase the size of the routing table for most backbones, and lead to sub optimal routing in some cases since I'm announcing the more specifics due to geographical diversity.
Announce the /20 to your transit providers, and the more specifics with no-export. Verio's position is that they don't want to or need to hear your /23s unless you are a customer, and for the most part they are right.
But I've broken my /20 into a /21 for Ottawa, a /22 for Toronto, a /23 for Montreal, and a /23 for expansion. I'm currently only getting transit in Toronto, but will have a second transit provider restored in Ottawa (I was using GT for a short while). While announcing the the /20 will my network is reachable for single-homed Verio customers, it won't provide the true best path that simply accepting the regional more specifics. -Ralph