I have a customer using a 100 Mbps Ethernet circuit and I need a router that can handle that type of throughput. Is it possible to give me the algorithm you guys use to figure this out with concurrent services of Voice, NAT, Encryption?
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Unsure you'll find an algorithm, as performance for different services depends much on platform and IOS version. Usually, best you can do is go by performance fact sheets provided by vendor. For the later ISRs, Cisco has a nice performance whitepaper (which I've attached a copy).