IPRAN grid-ring topologies - Problem statement for Fast IGP Convergence algorium Susan Hares drafu-hares-lsr-grid-ring-convergence
What Makes some IPRAN Topologies unique A B C D 1 2 Not the Random styles of Dense mesh of GRID topologies 3 4 Data center 5 6 15 16 7 8 9 10 11 12 13 14 21 22 17 18 19 20 23 24 25 26 Rings connected to 28 29 30 27 31 Two GRID nodes 5 6 I (ring-grid node) H A B C D E F G M J K L N O Hares - LSR - IPRAN topology + FAST IGP 2 Convergence Flooding
Basic Unit of Grid Red most Connected node Hares - LSR - IPRAN topology + FAST IGP 3 Convergence Flooding
Example 9X 12 Grid A B C A B C A B C A B C H G I H G I H G I H G I F E D F E D F E D F E D A B C A B C A B C A B C H G I H G I H G I H G I F E D F E D F E D F E D A B C A B C A B C A B C H G I H G I H G I H G I F E D F E D F E D F E D Hares - LSR - IPRAN topology + FAST IGP 4 Convergence Flooding
Problems with IPRAN deployments • Ring with routers (usually Sonet) connect to two Grid Routers – mobile RAN nodes hang ofg routers • GRID size varies (20 by 20 to 10K by 10K, >>) • Desire single IGP, but need fast convergence (less than 200 ms a goal) • Rolling power outage in some deployments where power grid has problems Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 5
Desired in Fast IGP Technology • Zero-confjguratjon for Ring (self- confjguratjon or template based) • Fast IGP – Minimize convergence tjme under 200ms for fast IGP convergence algorithm. – Algorithm used only afuer initjal IGP converges – Fast Reroute must handle multjple failures (from rolling power outages/brownouts). Hares - LSR - IPRAN topology + FAST IGP 6 Convergence Flooding
Drafu Content + Next Steps • Drafu: contains convergence equatjons – to provide theoretjcal background. • Next Steps: Can we evaluate the network topology when considering the value of alternatjve FAST IGP algorithms? Hares - LSR - IPRAN topology + FAST IGP 7 Convergence Flooding
Questjons Hares - LSR - IPRAN topology + FAST IGP 8 Convergence Flooding
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