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Issues in Tunnel Convergence Solutions

Issues in Tunnel Convergence Solutions. Thomas C. Schmidt t.schmidt@ieee.org HAW Hamburg . Two Types of Tunnelling Problems. Convergence Multiple tunnels terminate at MAG, possibly transporting duplicate traffic Inherent to the PMIP base solution Avalanche

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Issues in Tunnel Convergence Solutions

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  1. Issues in Tunnel Convergence Solutions Thomas C. Schmidt t.schmidt@ieee.org HAW Hamburg

  2. Two Types of Tunnelling Problems • Convergence • Multiple tunnels terminate at MAG, possibly transporting duplicate traffic • Inherent to the PMIP base solution • Avalanche • Tunnel head serves many MAGs causing a high replication load of identical traffic • Inherent to the M-Head (M-LMA) proposal

  3. Further Objectives • Enhance Service Availability • Extend access to multicast channels • Reduce Service Cost • Optimize access / routing to reduce network load • Remain transparent with respect to PMIP evolution • In particular: Cross-domain access

  4. Use Cases • Case 1: • User wants to have access to home subscription channels while moving to a visited network • Case 2: • User may want (to pay extra fees) to access local content depending on location (e.g., pay-TV in hotel) • Case 3: • If content can be accessed from more than one location, MAG could select the best path based on routing cost

  5. Current Solutions / Proposals • Base Solution: • Covers use case 1, tunnel convergence problem • Direct Routing: • Covers use case 2, optimized – but requires local mcast routing • M-Head/M-LMA: • Covers use case 1, avalanche problem • All-PIM Domain: • Unclear: depends on non-PMIP unicast routing at MAGs, most likely equivalent to direct routing

  6. Path to Solution & Problems Objective from Use Cases: Combine base solution (home subscription) with local service access Problems to solve: • Multicast routing intelligence at MAGs • How to access which group? • Make handover smooth & policy-compliant • Handle mixed access seamless without access violations

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