Page Comparison

Link State-protocol: #each router adv about the state of his links / interface's subnet
Hierarchical ,  Area type: backbone, std , Stub, NSSA
All routers share the same database when in the same Area
Route redistribution ( from/to other protocol ) + summarization 
OSPF-TE:  carry BW,

1- place the source router at the root of the tree
2- calculate the cost ( Ref BW/link BW) to the destination
3- pick the one with the lowest cost

OSPF-TE: build a separate tree with all other constrate: BW, ...

Multicast @ ( + unicast)

L3 Multicast address:
        All OSPF Node: 224.0.0.5
        All DR/BDR: 224.0.0.6
L2 Multicast address:   
       01-00-5E-00-00-05 & 01-00-5E-00-00-06