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Arista Network Scalability

Arista Network Scalability






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    Arista Network Scalability Arista Network Scalability Document Transcript

    • at- a- g l ance Data Center Class Scaling Data Center Networks What is Arista’s de nition of scalability of a data center INSIDE network? What are the critical requirements and what issues must be solved to address data center scalability? SCALE the ability for network Scalability of the data center network is the ability for network technologies to accept increased traffic or number of devices technologies to accept increased traffic or new devices without without impacting the impacting the contribution margin. contribution margin Achieving this challenging goal in the data center network has WHY several components: Today demanding more ports • scaling up the performance of single systems, as this allows than any switch can support more price/performance linearity without oversubscription takes six-times the number of network • extending or stretching the addressing of a network to embrace elements workload mobility across increased geographic distances and larger data center facilities WHO CARES IT professionals who need to deliver maximum performance • scaling the manageability and operational capabilities of the while maximizing efficiency. IT network infrastructure in the data center network so that a leaders who are passionate about smaller number of administrators can manage a larger number technology, yet realistic about the of systems more effectively. Additionally provide increased business. visibility to the network, and all of the devices that are required to deliver IT services. This includes integration with automation WHAT IS NEXT systems via open and extensible APIs. Network technologies are being disrupted by end-user and • topology scalability - topologies must continue to self-organize business leader demands for and self-heal while failing over quickly in the event of link or lower-cost, consistent uptime, nodal failure. In the data center topologies can be more rigidly better SCALE. structured than in campus networks where fundamental building architecture often dictates the physical topology of the Virtualization, Cloud Computing, network. In a structured topology technologies that make all and 10Gb/40Gb/100Gb bandwidth available, reduce the dependency on the artificial technologies are all disruptive insertion of loops into the network, and enable integration of elements that cause architectural topology change with planned operational procedures are part change. A new design is required. of Arista’s Extensible Operating System - EOS. NETWORK SCALABILITY
    • SUB-LINEAR SCALABILITY 64-PORT 10GB SWITCH VERSUS 384-PORT 10GBE SWITCH EXAMPLE A wire-rate 64 port 10Gb Ethernet switch can linearly scale cost with up to 64 ports. After 64 ports the contribution margin is severely impacted because it takes a second stage of switches and four access switches to deliver 128 wire- rate interfaces, and at a requirement for 512 ports the wire-rate network needs 16 Access Layer Switches and 8 Aggregation Switches to meet the performance requirements. The below example contrasts the numbe of devices needed to scale out an Ethernet network contrasting 64 nd 384-port devices. Arista’s Cloud Network architecture is designed to deliver far more linear scalability to hundreds of 10Gb Ethernet interfaces and thousands of Gb Ethernet interfaces Wirespeed 10GbE Host Ports 32 64 128 256 384 512 virtualized and multi-tenant environment fall The critical requirements of data center network into several key areas: scalability are: • Cost effective host and network Ethernet • a portfolio of high-performance switching interfaces that match the CPU PCIe speeds - i.e. platforms with a consistent operating model 10Gb and 40Gb Ethernet across platforms • Serial and Parallel 40/100Gb Ethernet • ability to manage multiple devices as a single Interfaces for uplinks that can be deployed and manageable system without trading off aggregated at useable densities to preserve functionality to scale operations clean network designs • ability to construct high-performance multi- • Efficient and stable link aggregation system topologies without reducing the technologies to scale current 10Gb uplinks capacities of each system or introducing • Scalable network operating system blocking architectures architecture that has open, well defined, • ability to linearly scale to a larger number of programmable, machine readable, and high-performance interfaces that map cleanly version-controlled interfaces, other than CLI, to a servers ability to generate I/O and a for provisioning of network services storage systems ability to consume/source • Trusted segmentation mechanisms that are data auto-negotiated between hosts and networks and then carried across the network fabric The innovations that will be required to deliver • Scalable way of implementing global network on the promise of a more linear scalability of data policies and the ability for these policies to be center networks while embracing data centers set and coalesced with external management with increased systems densities, high capacity systems from multiple-vendors HVAC environments, and a much more NETWORK SCALABILITY
    • What are the relative economics and common use in today’s data centers than costs/bene ts of Arista's technologies? just block-based storage initiator consolidation. Arista aims to have the best price/ performance ratio in the data center switching market - thus the best linear scalability. What are the right metrics to measure my network scalability on?  As one example Arista delivers the only 48-port 10GbE single RU top-of-rack Key metrics in the data center networking switch on the market today - the Arista market are: 7148SX. Since a requirement to double • Price per Gigabit throughput the port density of a single-device while • Price per Wire-Rate host 1GbE Port maintaining forwarding performance • Price per Wire-Rate host 10GbE Port requires six times the number of switches • Price per Million Packets per Second Arista can achieve a significant cost (for L3 devices) advantage for 1RU server aggregation • Power Draw, Overall above other vendors while saving space, • Power Draw per Wire-Rate 10GbE critical in a co-location environment Port where space consumed can be directly • Power Conversion Efficiency measured as operations expense. The • Failover time for nodal failure Arista 7500, used in Figure 1, delivers the • Failover time for link failure equivalent Layer-2 and Layer-3 • Failover time for planned forwarding performance of up to 18 maintenance with default competing Ethernet switches that have, at commands best, 64-ports of 10Gb density at • Failover time for software upgrade wirespeed. • Disruption/loss during system boot/ insertion Arista’s model of focused low-latency, • Port-to-Port Latency in the data high performance, high density, data center (single-switch) center optimized product development is • Port-to-Port Latency in the data in direct contrast to orthogonal strategies center (any port to any other, multi- from other network vendors. system) While Arista does not have software Arista's solutions are compelling on all support for FibreChannel technologies above metrics.  Arista provides full today, the Arista 7100 series is half the wirespeed switches optimizing price/ size, twice the density, one fifth the performance.  Wirespeed with larger port latency, half the power draw, and both counts means fewer switches in the data switches and routes unicast and multicast path, and thus a more scalable data packets - capabilities we feel are in more center network. NETWORK SCALABILITY