There are four DCs in a domain: DC1, DC2, DC3, and DC4.
There is a child domain with one DC: CDC1
Replication links for DC1 and DC2 are automatically created for only DC3 and DC4.
Replication links for DC3 and DC4 are automatically created for only DC1 and DC2.
A Replicaition link for CDC1 is created for DC1, DC2, DC3, and DC4. But no replicaiton links for any DCs are created for CDC1.
How can this be remedied so that replication links for all DCs are created for all DCs?