On Sat, 11 May 2002, Michel Py wrote:
2. The network structure. For a dial pool that size, there is absolutely no need for more than one level of aggregation (that would be the pop level).
In practise, we could also be talking about two levels: one delegation to the university, and dial/DSL/etc. portion of the block there.
On a 3-pop setup, the worst you would have 9 boxes per pop, which still is 17,496 sites and a HD of 0.881. This is the absolute worst case scenario.
The bottom line is that a typically organized /32 dial pool has up to 40k sites.
/32 allocated _specifically_ for dialup/DSL/whatever (and *not at all* for infrastructure) has this very useful quality. This is very I advocate separate, "earmarked" blocks for dialup/DSL/whatever, if it is done in such a big scale that /48 for organization or /32 for an ISP would not be enough. If you just give out an /32 which should be used for everything, I think the problem is more serious. One can not know beforehand how big a block of that /32 must be reserved to dialup/DSL/whatever. And after it is reserved, what if there is a need to expand? These things do happen within a time span of 2-3 years. This is where HD ratio is useful. -- Pekka Savola "Tell me of difficulties surmounted, Netcore Oy not those you stumble over and fall" Systems. Networks. Security. -- Robert Jordan: A Crown of Swords