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As described earlier (see figure 20.1), filters can be attached to a diffusion node for various reasons. There can be basic diffusion filters providing two-phase-pull (GradientFilter) and one-phase-pull (OnePhasePullFilter) diffusion routing algorithms. There is the GeoRoutingFilter or gear that provides a certain location (co-ordinate) based routing algorithm. There is also other filters for RMST routing algorithm (RmstFilter), logging (LogFilter), source routing (SourceRouteFilter) and tagging (TagFilter). See Commands at a glance section for details on APIs for adding filters to a diffusion node.