1. Router Advertisement Link Identifiers (LinkID)
draft-pentland-mobileip-linkid-03.txt
Brett Pentland – Monash University

2. Outline
Creates a link identifier to allow hosts to quickly recognise link changes
New LinkID ND option for router advertisements
Routers on a link negotiate a consistent LinkID using Router-to-Router messages from DetFastRA

3. Main Changes from Version –02
Stable storage for Link Identifiers
Monitor RAs to detect link joins and initiate LinkID change

4. Running Code GD implemented router part as patches to radvd
Implemented alongside deterministic FastRA
Shares router-to-router messaging and state machine
No SEND (yet)

5. LinkID Type Currently 48 bit random number Alternatives:
Longer random number
Address Prefix

6. 48 Bit Random Identifier Pros: Very simple
Fits in a minimally sized 64-bit RA option
Cons:
Not globally unique
High probability that there will be pairs of networks somewhere that use the same LinkID
Requires “good” random numbers which be scarce

7. 64-bit Prefix Based Identifier
Pros:
Can be globally unique
Cons:
Requires 128-bit RA option
Need to ensure that prefix used as LinkID is still valid on the link
May not be any global prefixes available – unique local prefixes?