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The topology-based routing techniques can be reactive (on-demand), proactive (table-driven), and hybrid.
We refer here to the IETF MANET Working Group classification[3] which subdivides protocols into proactive (table-driven routing or source routing) and reactive (on demand or distributed routing) and considers a flat logic organization of the network where all the terminals have the same functionalities.
In fact, the routing data kept in the proactive tables should be preferred as they are associated to stable routes.
The end result is a proactive routing table that only contains MODE 3 entries and a reactive routing table that contains an entry to node A that was previously proactive, but that has been converted to a reactive entry.
Table 1 Components of routing protocols Routing Forwarding Maintain or establishment strategy recover strategy Proactive Routing table based Beacon Reactive Greedy Greedy forwarding Per-hop decision Semi-controllable Store and carry.
Next, the proactive routing table for that destination is updated.
When a static node receives a frame, it first searches in its proactive routing table for a valid path.
When a node receives the update entry, it will first check if it still has a MODE 3 entry to that destination in its proactive routing table.
GREENIE promotes the use of the most stable links so that the routing information kept in the proactive routing table is preferred.
If there is an active connection to that destination that uses the sender of the DEGRADE_DESTINATION update as next hop, the current proactive routing table entry is replaced by a reactive routing entry.
For all other MODEs 2 and 3 entries (thus for destinations different from the neighboring node) that are using the neighboring node as next hop, the proactive routing table is updated.
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