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ATM LSR

This white paper by Chuck Semeria offers a comprehensive analysis of cell-switched MPLS, detailing its operational model and migration strategies for enhancing IP services. Key features of ATM LSR, such as the requirement for control-plane IP packet exchanges over ATM-control VCs and the use of VCI/VPI fields for label carrying, are explored. The paper addresses issues including label space and resource partitioning, as well as the advantages of ATM MPLS over IP over ATM, highlighting QoS management and the simplification of connectivity among edge routers.

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ATM LSR

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  1. ATM LSR Reference: A white paper from Juniper Networks Appendix I: Cell-switched MPLS Operational Model in “Migration Strategies for IP Service Growth: Cell-switched MPLS or IP-routed MPLS” by Chuck Semeria

  2. ATM LSR

  3. ATM LSR Unique features of ATM LSRs: • Must exchange control-plane IP packets over an ATM-control VC. SAR is required • Use of VCI or VPI/VCI fields to carry label • Pushing or popping labels within an ATM LSR domain is not supported • New mechanisms for detecting and preventing loops

  4. ATM LSRShips-in-the-Night

  5. ATM LSRShips-in-the-Night • Issues: • Label space partitioning • Resource partitioning • CoS and QoS support

  6. ATM LSR Using both VPI and VCI fields for direct connection:

  7. ATM LSR Using VCI Field for Indirect Connection:

  8. ATM LSR Frame based MPLS encapsulation:

  9. ATM LSR Cell based MPLS encapsulation:

  10. ATM LSR Label Merging at frame based LSR

  11. ATM LSR VC Merge at ATM LSR:

  12. ATM LSR Advantages of ATM MPLS over IP over ATM: • Single control plane • Removing the need for N^2 full meshed connectivity among edge routers • Simplify the QoS management: now CoS to LSP mapping is possible • Native ATM can be supported Problems: • Cell tax • SAR bottleneck

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