Forum Discussion
Jinshu
Aug 19, 2016Cirrus
Forwarding of traffic between route domains is by default enabled between route domains in a parent-child relationship only. (That is, traffic received in a child route domain can be forwarded to a parent route domain and the reverse.)
Consequently, by default, the BIG-IP system does not load balance traffic arriving in route domain 1 to servers in any other route domain, except for the parent route domain.
As ekaleido explained, you might need a next-hop for communicating between route domains if there is no parent-child relationship.
-Jinshu