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ATM LSR

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. ATM LSR. ATM LSR. Unique features of ATM LSRs:

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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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