When the DRO creates proxy receivers for message forwarding, be aware that the transport sessions carrying those messages are not extended to the destination TRD. Instead, the proxy receiver simply takes the messages from the originating transport sessions and transfers them to the destination DRO's proxy sources. The proxy sources create new transport sessions for those outgoing messages.
The proxy sources' outgoing transport sessions are unrelated to the originating sources' transport sessions. They can even use different transport types, performing a protocol conversion. In fact, a single DRO transport session can contain multiple sources from different originating publishing applications for the same topic. Alternatively, multiple sources from the same originating publishing application which are mapped to the same originating transport session can be split into multiple transport sessions by the proxy sources in a remote TRD.
One consequence of the independence of incoming and outgoing transport sessions is that TCP flow control does not transit the UM Router. A slow receiver in a remote TRD cannot "push back" on a fast source. In cases where a TCP transport session is slowed down due to one or more slow receivers, an intermediate UM router will buffer and may eventually have to drop messages.
Dynamic Routing Guide
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