NTLP strawman draft-schulzrinne-gimps

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NTLP strawmandraft-schulzrinne-gimps

• Henning Schulzrinne
• Columbia University

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Philosophy/approach

• "Tool kit" approach
• allow different NSLPs to choose trade-offs as
  needed
• from unreliable one-shot to reliable
  large-message delivery
• allow NEs to choose time vs. space trade-off
• RSVP-like in philosophy
• follow data path (but logically separable)
• soft state state time-out, with explicit state
  removal
• Transport philosophy
• do easy parts within simple transport
• small messages (lt 500 bytes) ? no fragmentation
• first messages in session (unknown next hop)
• reliable hop-by-hop delivery
• leave hard parts to real transport protocols
• invoked only when needed
• offer fast recovery (lt nRTT), flow control,
  congestion control, fragmentation,

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Other design choices

• TLV structure like RSVP
• Refresh reduction like 2961 (needs details)
• No explicit support for multicast
• but addable strict hop-by-hop behavior should
  make this easy

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What needs work

• Name ?
• State maintenance for transport state
• remove when last session state removed
• remove after idle timer (trade space for time)
• remove LRU when out of space
• State estimate ( sessions next hops)
• Describe NSLP-specific next-hop selection
• Packet format
• Multihoming
• NAT behavior
• Mobility behavior
• primarily dead-branch removal
• Security mechanisms
• can negotiate TLS and IPsec
• how much is really needed