draft-pentland-dna-protocol3-00.txt

1
draft-pentland-dna-protocol3-00.txt

• Brett Pentland

2
Agenda

• Document description
• Open Issues
• Consensus call

3
Background

• Based on two prior proposals
• draft-pentland-dna-protocol-01.txt
• draft-jinchoi-dna-protocol2-01.txt
• Only one fast RA scheme
• Link Identification schemes merged

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Fast RA

• Taken directly from draft-pentland-dna-protocol-01
  .txt

Token A
Token B
Token C
Access Routers
RS
Token S
Host
Say that B XOR S lt A XOR S lt C XOR S

• B sends an RA immediately
• A sends an RA after 20 ms
• C sends an RA after 40 ms

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Link Identification

• Routers listen for all prefixes on a link
• In general, all prefixes included in RAs
• New option for learned prefixes
• One noted as LinkID prefix
• MUST be included in RAs
• Hosts SHOULD include a landmark in RSs
• If the landmark is on the link, routers may send
  an abbreviated RA containing only the landmark
• If the landmark is not on the link or theres no
  landmark routers send a Complete RA
• Unsolicited RAs MAY carry a subset of prefixes
  but MUST include the LinkID prefix

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Link Identification
B A
A B
D
C
D
C
ARs
RA(C)
RA(D)
RS(A?)
APs
RS(A?)
Host
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Open Issues

• Identification based on non-prefix information
• No supporting emails on mailing list
• Explicit link identifiers
• Some other discussion suggests there is interest
• TSLLAO
• Needed for unicast RS/RA w/o NS/NA
• Where does this belong?
• Delivery of MLD packets during DNA?
• presentation to follow

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Open issues (cont)

• Packet delivery to/from node during DNA i.e.
  between the RS and RA
• What should hosts do with queued packets?
• Do we need separate Y/N flags for the Landmark
  Option?
• Probably not.

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Possible LPO format
0 1 2
3 0 1 2 3 4 5 6 7 8 9 0 1 2 3
4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
-------------------------
------- Type Length
LP Reserved Prefix Len 1
-------------------------
------- ... Prefix Len
N Padding
-------------------------
-------




Prefix 1




--------------------
------------




Prefix 2




---------------
----------------- ...
-------------------------
-------




Prefix N




--------------------
------------

• Use a flag to mark the first prefix as the LinkID
• Use a further flag to mark it as not a prefix
• Need host processing rules

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Where to now?

• Is this close enough to the mark to accept as a
  WG draft?