Nuts and Bolts
Designated Routers and Adjacency
- Both protocols elect a designated router on multiaccess networks to remove O(N^2) link problem (by creating a pseudonode) and to reduce flooding traffic (DR ensures flooding reliability)
- OSPF elects both a DR and a Backup DR, each of which becomes adjacent with all other routers
- BDR takes over if DR fails
- DRship is sticky, not deterministic
- Complex algorithm