Definition of downstream and upstream within RCA
Use this information to understand how the terms downstream and upstream are applied within the RCA plug-in.
Definition of terms
The terms downstream and upstream are used with reference to the poller entity.
- Downstream
- Specifies a location on the network topologically more distant from the polling station but on the same physical path as a second location.
- Upstream
- Specifies a location on the network topologically closer to the polling station but on the same physical path as a second location.
In complex networks, the distance of devices from the polling station changes as devices are deactivated. This change in distance has an impact on which devices are upstream or downstream.
Example
The figure below shows an example of upstream and downstream locations. In this example, device B is downstream of device A; therefore, device A is upstream of device B.
