Ce the cio perspective part ii v2 3 21-6-11
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Ce the cio perspective part ii v2 3 21-6-11



This is the second presentation out of 3 on Slideshare reviewing the enterprise needs, issues and considerations from WAN services from CIO point of view. This presentation series is for CIOs and the ...

This is the second presentation out of 3 on Slideshare reviewing the enterprise needs, issues and considerations from WAN services from CIO point of view. This presentation series is for CIOs and the providers that offer such services. All you need to know about carrier Ethernet service levels and SLAs – what matters to the users and what a service provider should offer.
Part I – why chose carrier Ethernet WAN services
Part II – Service levels and SLA
Part III – Ethernet and IP VPNs – when to use each



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    Ce the cio perspective part ii v2 3 21-6-11 Ce the cio perspective part ii v2 3 21-6-11 Presentation Transcript

    • Carrier Ethernet – The CIO PerspectivePart II: Service Levels and SLAs
      RAD Data CommunicationsJune 2011
    • What’s in an SLA?
      A business-grade SLA for Carrier Ethernet services will typically include the following:
      Connection rates
      Class of Service (CoS) levels definition and traffic priority settings
      Bandwidth commitments per CoS
      Quality of Service (QoS) KPI (Key Performance Indicators) guarantees
      Monitoring and reporting
      Service and support hours, response and repair times
      Credits/SLA violation remedies
    • Carrier Ethernet SLAs Throughput Guarantees
      CIR: Committed Information Rate. Bandwidth with guaranteed delivery, regardless of network conditions
      EIR: Excess Information Rate. The bandwidth allowance depending on network resource availability
      PIR: Peak Information Rate; CIR+EIR – defines the maximum bandwidth allowed
    • Carrier Ethernet SLAs – CoS, QoS and KPIs
      Each level requires differentiated SLAwith appropriate QoS parameters to ensure user QoE (Quality of Experience)
      “Bursting” is the ability to exceed the designated bandwidth for a short period to avoid traffic dropping
    • Key service elements that directly effect QoE
      Availability: Network uptime on a monthly basis, after measuring the number of minutes and seconds that the service was unavailable to the enterprise
      Business-grade SLA: 3-5 Nines (99.9% -99.999%), depending on CoS
      Latency: The time for transmitting a packet/frame of data from a source to its destination
      Effect on voice traffic: Delays, overlapping speech, echo
      Effect on video traffic: From blanks to session termination
      Jitter: The difference in delay between two consecutive frames/packets
      Effect on Voice: Static, distorted speech
      Effect on video: Momentary signal loss, shaky image
      Loss: Percentage of undelivered frames out of all sent frames
      Effect on data: requires re-transmissions which lower throughput
      Effect on video: Momentary signal loss, graininess, session termination
      MTTR: Mean Time to Repair
    • KPI Performance Objectives
      KPI Performance Objectives, Business Services* (MEF 23.1 Draft):
      * Metro, point-to-point
    • KPI Performance Parameters
      An SLA should specify how parameter values are measured: The percentage of traffic to which the guarantee is applicable, over what time interval, etc (MEF 23.1 Draft):
    • Monitoring and Reporting: Are You Getting the SLA You’re Paying For?
    • Monitoring and Reporting: What You Should Look for?
      Choose a service provider that can provide performance reports:
      Monitor the service
      Compare actual performance to the SLA you buy
      Get service credits when the service provider fails to deliver
      Change service provider if failures are repeated
      Different reporting options:
      Periodical (weekly/monthly)
      Self-managed 24x7 portals: View KPI data in real-time
    • Service Provider Tools to Guarantee Carrier Ethernet SLAs
      Service providers can now implement the following capabilities in their networks:
      Traffic and bandwidth management for multilevel QoS
      Performance monitoring and reporting
      Fault detectionand repair
      Resiliency and protection
      In order for these attributes to be effective, they need to be implemented at the service hand-off point, i.e., in the service provider’s CPE (also called Ethernet demarcation) installed at customer premises
    • Multi-CoS Traffic Management Tools
      Traffic classification according to enterprise preference and equipment (e.g., IP Precedence, address, VLAN Priority bit, etc)
      Advanced traffic mapping to ensure QoS adherence and transparency of user classification over the WAN
      Rate metering and policing per CIR/EIR profiles for multi-flow Ethernet connections (i.e., different profiles over the same link)
      Hierarchical scheduling for multi priority traffic
      Traffic shaping and queue management to avoid packet dropping and congestion
      CoS 7 = Management
      CoS 6 = VoIP
      CoS 5 = Video
      CoS 4 = Interactive
      CoS 3 = Priority Data
      CoS 2 = Other Data
      CoS 1 = Best Effort
      CoS 0 = Best Effort
      An 8-CoS Traffic Queue
    • Service Lifecycle Management Tools
      An elaborate set of tools to provision, monitor and control Ethernet services at turn-up, as well as for on-going monitoring and fault management
      Specific standardized tests to continuously evaluate SLA performance metrics and report results/statistics to network management system (OSS/BSS)
      Shorten lead-times for fault identification and resolution to avoid service disruptions
      Identify trends and take preventive measures before service and users are affected
    • Resiliency and Protection Tools
      Ensure High Availability and speedy restoration by protecting the links, as well as the entire service path
      Standardized redundancy schemes:
      Link Aggregation: Parallel connections are bundled to a single virtual link
      Ethernet Linear Protection Switching: Redundancy at the service path level with an EVC (Ethernet Virtual Connection) backup
      Ethernet Ring Protection Switching: Ring protection with fast failover
      Without proper protection mechanisms QoE is compromised due to retransmissions or even loss of service
    • Additional Questions to the Service Provider
      Is the Ethernet service certified by the MEF (Metro Ethernet Forum)?
      Can the service provider guarantee service consistency even when some locations are not fiber-fed?
      Can the service provider guarantee service consistency even for out of footprint locations (e.g., on a national and global scale)?
      How accurate are the link quality and service performance measurements?
      How many provider boxes need to be installed at the premises (e.g., CPE/demarcation and test probes)?
    • In Conclusion
      Carrier Ethernet SLAs should include specific definitions of service levels and guarantees for key performance indicators
      Service KPIs directly effect how users experience application performance. KPI metrics differ by provider, but industry standardization efforts are under way
      Getting SLA reports ensures you get what you paid for
      Business-grade services require smart Ethernet demarcation devices to be installed at customer premises
      Check out other installments in the series:
      Part I: Why Choose Carrier Ethernet WAN Services?
      Part III: Ethernet and IP VPNs, When to Use Which?
    • Visit www.ethernetaccess.com for more information