Ad hoc On Demand Distance Vector (AODV) Routing …
Ad hoc On Demand Distance Vector (AODV) Routing Protocol
CS: 647 Advanced Topics in Wireless Networks
Dr. Baruch Awerbuch & Dr. Amitabh Mishra Department of Computer Science Johns Hopkins
4-1
Reading
Chapter 6, Sections 6.1-6.3, 6.5 ? Ad Hoc Networking, Perkins, Addison Wesley, 2001
4-2
Outline
Introduction AODV properties Route discovery
Flooding
Route maintenance Local connectivity management ? Hello
Messages Summary
4-3
Introduction: DSDV vs. AODV
DSDV broadcasts every change in the network to every node
When two neighbors enter communication range of each other
This results in a network wide broadcast
Similarly when two nodes drift apart from each other's range ?> link breakage
Also results in a network wide broadcast
Local movements have global effects
In AODV such broadcasts are not necessary
If a link breakage does not affect on going transmission -> no global broadcast occurs
Only affected nodes are informed
Local movements of nodes have local effects
AODV reduces the network wide broadcasts to the extent possible
Significant reduction in control overhead as compared to DSDV
4-4
Ad Hoc On Demand DistanceVector (AODV) Routing (1)
Reactive or on Demand Descendant of DSDV Uses bi-directional links Route discovery cycle used for route
finding Maintenance of active routes Sequence numbers used for loop prevention
and as route freshness criteria Provides unicast and multicast
communication
4-5
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