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Re: Sprint BGP filters in 207.x.x.x?
> MCI aggregates all its customer's routes into /19's. We have just > received our first block of address space from the 207.x.x.x range. If > you continue to filter at /18's for the 207.x.x.x range, you won't be > able to reach all of MCI's customers. > > Needless to say MCI would appreciate it if you'd change your policy to be > /19's, and I'm sure Sprint's customers would appreciate it as well. > ========== > Aside from what Daniel says about Sprint and MCI's routing policy > mismatch, this statement is interesting on another level. For Dan says: > MCI aggregates all its customer's routes into /19's. This is new is it > not? Also it says *MCI* does the aggregating and not the customer. That may hold true internally, however, I suspect that externally, they announce only /16's or /15's. Of course, I could be wrong. What I see right now, is only one announcement from the 207 block...a /19 coming from netaxs, and then some customer of PSI is announcing 5 or so /24's in the 208 block! > Would someone please explain how this differs from what I understand to > be Sprints policy which says (i believe) that it is the CUSTOMER's > responsibility to aggregate the routes they present to sprint??? Sprint already proxy-aggregates for many of their customers. Most of them probably don't realize it. It doesn't even affect most of them. > Why would MCI do the aggregating? Is such mci policy good for mci or > good for the customer or equally good for both? Depends on the situation as to whether it's detrimental. Proxy-aggregation, as this is called, can alter traffic patterns in dual-homed situations. The change is not always bad, though it is often un-desirable. In general, proxy-aggregation is good for everybody. Dave -- Dave Siegel President, RTD Systems & Networking, Inc. (520)623-9663 Network Engineer -- Regional/National NSPs (Cisco) email@example.com User Tracking & Acctg -- "Written by an ISP, http://www.rtd.com/~dsiegel/ for an ISP."