Evolving Data Center Switching Amazon Web Services

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About the Author,Brad Hedlund,Technical Solutions Architect Data Center. Cisco Systems Inc,http bradhedlund com about,Blog http bradhedlund com. Twitter http twitter com bradhedlund,E mail bhedlund cisco com. Comments welcome,5 26 2010 BRAD HEDLUND COM,Why Evolve Data Center Switching. Transformational Paradigm Shifts, From Connectivity to Virtualization New Requirements.
Large Flat Scalable L2 fabrics, The Server is a fluid object Simpler Smarter Networks. Ultra High Availability, The virtual machine is the new Server Storage Ethernet consolidation. More bandwidth,The physical machine is the new Network. What s Next,Miniaturization Scale,The Data Center becomes a fluid object. Any server any VLAN anywhere anytime,5 26 2010 BRAD HEDLUND COM.
What works What needs to be improved SW2 SW3,REVISITING CLASSIC ETHERNET. Narrative of this section located at, http bradhedlund com 2010 05 07 setting the stage for trill. 5 26 2010 BRAD HEDLUND COM,Flooding Behavior,Unknown UNICAST BROADCAST. B MAC Table B,Allows Plug Play Foundational Behavior. Assists in MAC Learning A Eth 1 1 Assists in Discovery. B Eth 1 2 Assists in MAC Learning,C Eth 1 3 Plug Play.
D SW1 SW1 C,5 26 2010 BRAD HEDLUND COM,Classical Ethernet MAC Learning. Improvement All switches learn all MACs,SW1 MAC Table. Area TRILL A Eth 1 Plug Play,B Eth 1 Inefficient,D Eth 2 Unnecessary. SW3 MAC Table SW4 MAC Table,A Eth 1 A Eth 3,B Eth 2 B Eth 3. C Eth 3 3 3 C Eth 1,D Eth 3 SW3 SW4 D Eth 2,5 26 2010 BRAD HEDLUND COM.
Flooding with Multiple Paths,Plug Play loop prevention is needed. No Ethernet TTL,Unknown Unicast,Flooding Required,Infinite Loop. Improvement,A Area TRILL B,5 26 2010 BRAD HEDLUND COM. Classical Ethernet Loop Prevention,Spanning Tree Protocol STP. STP Enforced Tree Topology,R SW1 SW2 SW1 R,SW3 SW4 Plug Play.
Loop Free for flooded traffic,Single Topology for all traffic. Single Path for Unicast Improvement,Single Path for Multicast Areas TRILL. 50 Bandwidth Unused,A Timer based recovery B,5 26 2010 BRAD HEDLUND COM. Challenges Approaches SW3 SW4 SW5 SW6,SCALING THE DATA CENTER NETWORK. Narrative of this section located at, http bradhedlund com 2010 05 07 setting the stage for trill.
5 26 2010 BRAD HEDLUND COM,Scaling out Tier 1,Why scale out Tier 1 SW5 SW1 SW2 SW6. More Bandwidth at Tier 2,Larger Tier 2 Scalability. Smaller Tier 1 switches,Spread Risk RAID Tier 2 SW3 SW4. Pay as you grow,Lower latency,5 26 2010 BRAD HEDLUND COM. Scaling out Tier 1 with Classic Ethernet,with Spanning Tree Protocol STP.
SW5 R SW1 SW2 SW6 Tier 1,SW3 SW4 Tier 2,Improvement. Area TRILL,Why Scale Tier 1, Spanning Tree still required More Bandwidth at Tier 2. Blocking on all but one path Larger Tier 2 Scalability. Did not gain scalability Smaller Tier 1 switches,A Did not gain bandwidth B Pay as you grow. Low latency,5 26 2010 BRAD HEDLUND COM,Scaling out Tier 1 with Classic Ethernet. with Spanning Tree Protocol STP,SW5 R SW1 SW2 SW6 Tier 1.
SW3 SW4 Tier 2,Alternate Topology Why Scale Tier 1. Unbalanced at Tier 2 More Bandwidth at Tier 2, Only 1 switch with all paths Larger Tier 2 Scalability. Did not gain scalability Smaller Tier 1 switches,A Did not gain bandwidth B Pay as you grow. Low latency,5 26 2010 BRAD HEDLUND COM,Scaling UP Tier 1 with Classic Ethernet. Rigid 2 Switch Tier 1 design constraint forces Scaling UP not OUT. Improvement,Area TRILL,5 26 2010 BRAD HEDLUND COM,Multi Path with Classic Ethernet.
Multi Chassis Ether Channel MCEC aka Virtual Port Channel vPC. State Synchronization at Tier 1 STP finds a Loop Free Topology. No Blocking Paths All links active,R SW1 SW2 R SW1. SW3 SW4 SW3 SW4, Not a trivial accomplishment MAC learning Improvement area TRILL. Several different states must be synced LACP Multi path with minimal. Interface states config state sync complexity,Split Brain detection. 5 26 2010 BRAD HEDLUND COM,Scaling Tier 2 with Classical Ethernet. Scale Bandwidth or Size Pick one you can t have both. SCALING BANDWITH OR SCALING SIZE,SW1 SW2 Tier 1,SW3 SW4 Tier 2.
SW3 SW4 SW5 SW6,Trade off between Bandwidth or Size. Tier 1 switch density key scaling factor,Improvement. SW1 SW2 SW3 SW4 R Increasingly Complex State Synchronization across 4 or more Tier 1 switches SW1 SW3 SW4 R States amp Role Sync X 4 STP Roles MAC learning LACP Interface states config Split Brain detection Increased Complexity Difficult amp Fragile scaling STP still present SW5 SW6 5 26 2010 BRAD HEDLUND COM

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