The distsrv probe has a forwarding feature to reduce network load and help with package distribution speed. Rather than push a probe package multiple times over a Wide Area Network (WAN) you can have another copy of the archive on other hubs. The distsrv will forward packages on an interval increasing performance of probe deployments and updates and reduce load on the primary distsrv.
The distsrv forwarding function is ideal when you are in a multi-tiered hub environment connected via tunnels or slow bandwidth links.You will need to have multiple distsrvs in your environment. One on the primary hub (by default) and remote distsrvs under other hubs.
CA Unified Infrastructure Manager (UIM) 7.6 - 8.51
On the Primary Distsrv: