Topology dissemination
1. Flood LSPs on links except incoming link
- Require at most 2E transfers for n/w with E edges
2. Sequence numbers to detect duplicates
- Why? Routers/links may go down/up
- Problem: wrap-around => have large seq # space
3. Age field (similar to TTL)
- Periodically decremented after acceptance
- Zero => discard LSP & request everyone to do so
- Router awakens => knows that all its old LSPs would have been purged and can choose a new initial sequence number