US Robotics USR2410 Manual de usuario descargar pdf (Pagina 33)

5.2

DSDV Implementation

In order to route packets between mesh routers, a networking protocol had to be chosen. In the

network created, the DSDV protocol was used. The benefits of this protocol are described in

section 5.2.1. The implementation of this protocol within Click is described in section 5.2.2.

5.2.1

Protocol choice

The DSDV routing protocol was chosen because it was designed to work with a wireless network

of routers that know nothing about the other routers in the network. It takes advantage of the

wireless medium by using broadcast packets for route advertisement packets, but does not flood

the network with these packets. [4]

The DSDV routing protocol has been well tested in the past, allowing results from our network to

be applied to other networks. Because of the configuration of the mesh network created, a

proactive protocol, such as DSDV, was better suited to it. This is shown in two studies. In one

study comparing DSDV to AODV, a reactive protocol, it was found that DSDV preformed better

with higher traffic loads [7]. Another study also indicated that DSDV performs well when nodes

are not very mobile, dropping very few packets with a constant overhead of routing packets as the

number of routers increased. [8]

5.2.2

Click Implementation

The DSDV elements are part of the grid package of the Click Modular Router. They were

created to implement the DSDV Protocol as described in [4]. The following four elements were

used in the routing configuration files used in the mesh network.

5.2.2.1.

GridGatewayInfo

This element had two purposes. It defined if a router was a gateway, and addressed packets to the

closest gateway. If a router was acting as an Internet gateway, the element was declared with the

gateway flag set to true. If not, the flag was set to false. The element would change the

destination IP address annotation of an incoming packet to be that of the closest gateway, chosen

from the DSDVRouteTable element discussed below. If a router was a gateway, packets were

not sent through the GridGatewayInfo element, since they were to be forwarded out of the mesh

network by this router.

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US Robotics USR2410 Manual de usuario Pagina 33