Edit the shipping.conf file and add ROUTE options. For example, on each replica server host at SiteA add the following on a single line:
ROUTE SSA SiteB_host1 SiteB_host2 SiteB_host3 SiteC_host1 SiteC_host2 SiteC_host3
On Windows®, open the MultiSite Control Panel and set the appropriate values in the Routing Information section. For example, on each replica server host at SiteA, the Next Routing Hop is SSA and the Destination Hostnames are SiteB_host1, SiteB_host2, SiteB_host3, SiteC_host1, SiteC_host2, and SiteC_host3.
Using the same example as in Step 5, on the exposed host at SiteA, you add the following ROUTE options to the shipping.conf file:
ROUTE SSB SiteB_host1 SiteB_host2 SiteB_host3 ROUTE SSC SiteC_host1 SiteC_host2 SiteC_host3
On the exposed host at SiteB, you add the following ROUTE options to the shipping.conf file:
ROUTE SSA SiteA_host1 SiteA_host2 SiteA_host3 ROUTE SSC SiteC_host1 SiteC_host2 SiteC_host3
On the exposed host at SiteC, you add the following ROUTE options to the shipping.conf file:
ROUTE SSA SiteA_host1 SiteA_host2 SiteA_host3 ROUTE SSB SiteB_host1 SiteB_host2 SiteB_host3
shipping_server -pollon a regular basis (for example, every hour).