I've got a one way satcom link that is having errors and I want to use IP SLA to monitor. The satellite path is one way from A to B and I am trying to set up testing A to B but B cannot respond at least in the typical manner because there is no return link. I have a routed service channel that can reach back B to A so there is a path available if the IP SLA response packets could somehow route.
Routing decisions are not taken by IP SLA. Irrespective of what protocol/feature you use on IOS, network route has to be configured properly on the network itself, for symmetric or asymmetric routes.
IP SLA works in asymmetric route (where traffic goes from one route and comes back from another) properly. In fact its few operations like UPD Jitter are also, designed to show per direction data in asymmetric network.
Which IP SLA operation are you configuring?
Routing is not something which is expected from IP SLA to be done by itself. It will always depend on underlying network routing/switching for it to select best path to go to a destination and come back.
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