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| Key features | 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, |
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| Dijkstra / SPF Algorithm | 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, ... |
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| OSPF Message |
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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 |
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