1. Fast Router Discovery with RA Caching
draft-jinchoi-dna-frd-00.txt
JinHyeock Choi & DongYun Shin
Presenter: Greg Daley

2. Fast Router Discovery DNA Goal: Get RA fast
Can send RA immediately on ‘Link UP’
Where L2 Access Points are able to identify that users need RA information
Resend recently cached RA at L2
Requires Link-UP on AP only, not on hosts
Doesn’t modify packet formats

3. RA Caching Features Fastest possible RA reception
No random delay before response
Preserves Router Advertisement
Doesn’t break SEND
Only caches Unsolicited RAs
Optionally MAC unicast to host
Avoids problems with un-acked multicast

4. Potential issues/Extensions
Router/Option lifetimes embedded in RAs
Perhaps require caching only fresh information
Explicit indication of cacheability
Preferentially cache ‘Good’ RAs
Triggered RS may contend with cached RA
Potentially MAC/load dependent.
Existing MAC Queues on AccessPoints

5. Summary Stand-alone solution Doesn’t modify L3 packets/protocols
Has interaction with L2
Fastest RA reception
Two implementations (Samsung/Monash)

6. Interest? Some engineering work to do.
Provides an alternative DNA solution suitable for some environments
Document as Experimental ?
WG item or individual RFC?
Review and discussion suggested at WG mailing list in either case