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DiffServ Support in MPLS Networks

DiffServ Support in MPLS Networks. References: Juniper white paper: “Supporting Differentiated Service Classes: Multiprotocol Label Switching (MPLS)” IETF RFC3270: “Multiprotocol Label Switching (MPLS) Support of Differentiated Services”. DiffServ Enabled MPLS.

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DiffServ Support in MPLS Networks

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  1. DiffServ Support in MPLS Networks References: Juniper white paper: “Supporting Differentiated Service Classes: Multiprotocol Label Switching (MPLS)” IETF RFC3270: “Multiprotocol Label Switching (MPLS) Support of Differentiated Services”

  2. DiffServ Enabled MPLS • DiffServ traffic now follows an LSP directed path rather than connectionless IP paths • More predictable in terms of resource consumption and less over provisioning • Resources associated with an LSP can be reserved to provide highly predictable services

  3. DiffServ Enabled MPLS Two types of DiffServ enabled LSPs: • EXP Inferred LSP (E-LSP): the class information is in the EXP sub-field of the MPLS shim header • Label only inferred LSP (L-LSP): the class information is implied by the label value

  4. DiffServ Enabled MPLS • An example of an E-LSP:

  5. DiffServ Enabled MPLS • An example of an E-LSP:

  6. DiffServ Enabled MPLS • Benefits of E-LSP: • The operation of DiffServ over MPLS using E-LSPs is similar to the operation of DiffServ over native IP packets in the core. • Assuming a default PHB-to-EXP mapping, E-LSPs are supported by existing signaling and label distribution protocols without modification • Reducing the total number of LSPs • Limitations of E-LSP: • When an existing E-LSP is preempted, all service classes are preempted • Traffic engineering at aggregate level not per class level • Limited to 8 classes

  7. DiffServ Enabled MPLS • An example of L-LSPs:

  8. DiffServ Enabled MPLS • Benefits of L-LSP: • Better capability in supporting guaranteed services • Allowing per class based traffic engineering • Allowing LSP established across an ATM network • May support more than 8 classes • Limitations of L-LSP: • Dynamic creating of an L-LSP is not supported by the existing label distribution protocols • Manual configuration can be complex and time consuming • Adding complexity to network management to support higher number of LSPs

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