1. Link-State IGP Data-Plane Convergence Benchmarking draft-ietf-bmwg-igp-dataplane-conv-meth-17 draft-ietf-bmwg-igp-dataplane-conv-term-17 draft-ietf-bmwg-igp-dataplane-conv-app-167 March 24, 2009 Scott Poretsky, Allot Communications Brent Imhoff, Juniper 1IETF 74 – San Francisco, BMWG

2. Convergence Timeline, Full Convergence  Convergence Convergence Recovery Event Instant Instant Time = 0sec Forwarding Rate = ^ ^ ^ Offered Load = Offered Load --> ------ Packet -------------- <---Max Throughput \ Loss /<----Convergence Convergence------->\ / Event Transition Recovery Transition \ / \_____/<------Maximum Packet Loss ^ First Route Convergence Instant Y-axis = Forwarding Rate X-axis = Time (increases right to left to match commercial test equipment displays) Figure 1. Convergence Graph Convergence Event Trigger

3. Organized Terms 3.5 Benchmarks Full Convergence Time The amount of time it takes for Full Convergence to occur. (Full Convergence = Route Convergence for an entire FIB in which complete recovery from the Convergence Event is indicated by the DUT throughput equal to the offered load.) First Route Convergence Time The amount of time for Convergence Packet Loss until the convergence of a first route entry on the Next-Best Egress Interface, as indicated by the First Route Convergence Instant. Route-Specific Convergence Time The amount of time it takes for Route-Specific Convergence to be completed as calculated from the amount of Convergence Packet Loss for the flow associated to a specific route. Reversion Convergence Time The amount of time for the DUT to complete Full Convergence to the Preferred Egress Interface, instead of the Next-Best Egress Interface, upon recovery from a Convergence Event. IETF 74 – San Francisco, BMWG3 3.4 Benchmarking Method Rate-Derived Convergence Method The method to calculate convergence time benchmarks from the amount of time that Convergence Packet Loss persists upon occurrence of a Convergence Event. (Equation 1) Rate-Derived Convergence Method = Convergence Recovery Instant - Convergence Event Instant. Loss-Derived Convergence Method The method to calculate convergence time benchmarks from the amount of Convergence Packet Loss. Loss-Derived Convergence Method can be calculated from Convergence Packet Loss as shown with Equation 2. (Equation 2) Loss-Derived Convergence Method = Convergence Packets Loss / Offered Load where units are packets / packets/second = seconds

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