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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Number of BGP routes a large ISP sees in total
On Apr 17, 2007, at 8:20 PM, Yi Wang wrote: I guess what I see there is the lower bound of the path diversity? Because even Depends on the route server. If the route server has sessions with lots of edges, it will have lots of prefixes. If not, then it's generally got the same number of prefixes as you see in the CIDR report. But you said: "if the RIB of all routers in the ISP were merged, how many distinctive routes would there be?". Define "distinctive"? Are you including things like same prefix & path, but different next hop? If my guess is correct, the answer is "it varies". Some networks have literally a dozen or more interconnection points. If the networks are large, then you have 10s of 1000s of prefixes, with dozens of next hops, and perhaps multiple that by multiple networks. Then realize that many of the prefixes are duplicated across multiple peers and .... Anyway, the number is very difficult to determine. And it is highly dependent on the network you look at. Mind if I ask why you want to know? Perhaps there are some simplifying assumptions we can make, depending upon your application? -- TTFN, patrick On Apr 17, 2007, at 8:02 PM, Ricardo V. Oliveira wrote:
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