On Jun 2, 2013, at 1:51 AM, Ted Lemon <[email protected]> wrote:
> On Jun 2, 2013, at 1:22 AM, Owen DeLong <[email protected]> wrote: >> {ISP Connection} -> Router -> multiple segments each of which contains one >> or more routers, some of which have multiple segments which contain >> additional routers. >> All of the routers below the second tier are downstream from the routers at >> the second tier which are downstream from the first tier router. > > This is trivially solved with PD at the PE router that gets the delegation > from the ISP. I thought you were talking about a multi-homed topology. > Also trivially solved, but might involve two edge routers each with their own > set of prefixes to delegate. > You are assuming that all of the subordinate routers will act as DHCP relays rather than doing PD. That is certainly one possible solution, but, not necessarily ideal in all cases. In cases where the subordinate routers should receive delegations and perform their own PD for their subordinate routers, having a larger bit field can be useful for greater flexibility. Thus, providing 16 bits to the end site is, IMHO, worth while. Owen
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