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How Does MPLS QoS Work?. BE Criteria. AF Criteria. EF Criteria. Global Crossing VPN Service – CoS. CoS configuration and capabilities differ for traffic entering the VPN to traffic leaving the VPN. Inbound Classification of traffic

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global crossing vpn service cos

BE Criteria

AF Criteria

EF Criteria

Global Crossing VPN Service – CoS
  • CoS configuration and capabilities differ for traffic entering the VPN to traffic leaving the VPN
  • Inbound
    • Classification of traffic
      • Maps traffic into the three backbone Class (EF - Premium, AF - Enhanced, BE - Basic) via
        • Customer Classification using IP Precedence or DSCP code point value in the IP header
          • Assumes the customer is already using Differentiated Services in their network
        • Provider Classification using a combination of the following IP header values.
          • Source Address
          • Destination Address
          • Source Port
          • Destination Port
          • Protocol
      • A class classifier will only be provisioned if the customer has subscribed to the class

Traffic from CPE

  • Any Combination of class classifiers are supported
    • EF, AF, BE
    • EF, AF
    • EF, BE
    • EF
    • AF, BE
    • AF
    • BE

The final (last) classifier does not need any criteria as it will match all remaining unclassified traffic

global crossing vpn service cos1

BE Criteria

AF Criteria

BE Policer

EF Criteria

AF Policer

EF Policer

Global Crossing VPN Service – CoS
  • CoS configuration and capabilities differ for traffic entering the VPN to traffic leaving the VPN
  • Inbound
    • Policing of Traffic
      • Controls the volume of traffic in each class to a subscribed rate
        • Known as the Class Subscription Rate or CSR
        • Sum of the CSR rates must equal the port speed
      • The class and traffic subscribed to by a customer will dictate if a class policer is configured or not
      • Allows Global Crossing to control traffic according to 3 traffic models
        • Usage
          • Excess EF is Dropped; Excess AF is Dropped; Excess BE is Dropped

EF CSR

Usage

E1

AF CSR

Traffic from CPE

Discard

BE CSR

Discard

Discard

global crossing vpn service cos2

BE Criteria

AF Criteria

EF Criteria

AF Policer

EF Policer

Global Crossing VPN Service – CoS
  • CoS configuration and capabilities differ for traffic entering the VPN to traffic leaving the VPN
  • Inbound
    • Policing of Traffic
      • Controls the volume of traffic in each class to a subscribed rate
        • Known as the Class Subscription Rate or CSR
        • Sum of the CSR rates must equal the port speed
      • The class and traffic subscribed to by a customer will dictate if a class policer is configured or not
      • Allows Global Crossing to control traffic according to 3 traffic models
        • Usage
          • Excess EF is Dropped; Excess AF is Dropped; Excess BE is Dropped
        • Flat Rate
          • Excess EF is Dropped; Excess AF is marked BE; BE can use Full Port

EF CSR

Flat Rate

E1

AF CSR

Traffic from CPE

Discard

By Full Port we mean that we can receive a full ports worth of traffic for example 2Mb on an E1 for the given class at any instantaneous point in time, as long as no other class traffic is being received at that same point in time.

BE CSR

Sum of CSR’s = Port Speed

global crossing vpn service cos3

BE Criteria

AF Criteria

EF Criteria

EF Policer

Global Crossing VPN Service – CoS
  • CoS configuration and capabilities differ for traffic entering the VPN to traffic leaving the VPN
  • Inbound
    • Policing of Traffic
      • Controls the volume of traffic in each class to a subscribed rate
        • Known as the Class Subscription Rate or CSR
        • Sum of the CSR rates must equal the port speed
      • The class and traffic subscribed to by a customer will dictate if a class policer is configured or not
      • Allows Global Crossing to control traffic according to 3 traffic models
        • Usage
          • Excess EF is Dropped; Excess AF is Dropped; Excess BE is Dropped
        • Flat Rate
          • Excess EF is Dropped; Excess AF is marked BE; BE can use Full Port
        • Usage with Burst
          • Excess EF is Dropped; AF can use Full Port; BE can use Full Port

EF CSR

Usage with Burst

E1

AF CSR

Traffic from CPE

Discard

By Full Port we mean that we can receive a full ports worth of traffic for example 2Mb on an E1 for the given class at any instantaneous point in time, as long as no other class traffic is being received at that same point in time.

BE CSR

Sum of CSR’s = Port Speed

global crossing vpn service cos4

BE

BE

BE

AF

EF

BE Criteria

AF Criteria

EF Criteria

AF Policer

EF Policer

Global Crossing VPN Service – CoS
  • CoS configuration and capabilities differ for traffic entering the VPN to traffic leaving the VPN
  • Inbound
    • Mark the MPLS Header with relevant CoS value
      • Allows the entire network to treat the packet based on the Backbone class specified in the classification
      • Provides Diff Serv transparency.
        • By not modifying the IP Precedence value the customers marking stay intact

Send to Core with MPLS EXP =

Or

Send to egress Customer interface

Traffic from CPE

Discard

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    • Remote access solution for mobile workforce and remote locations
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    • Connections to Global Crossing Financial Extranet (content)
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    • Hosted applications
  • Convergence of applications: voice, video, Internet and corporate data
    • VoIP
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    • L2 Virtual Private Lines (VPLs) for legacy protocol transport (X.25, FR/ATM)
  • Business continuity
    • Redundant back-up with usage based-billing . . .
    • . . . also carries your extra traffic
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