Symptom:
cmts does not send ds override in the RNG_RSP.

Conditions:
1.Two mac-domains share downstream channel configuration and have the same DS service group,
so modems can receive MDD from both mac-domains.

2.CM locks the primary channel of wrong mac-domain.And CM picks up the primary MDD from the the wrong mac-domain.


CMTS should send DS override to CM instead of US override.

Exapmle topology which may hit this issue:
interface Cable8/1/1
downstream Integrated-Cable 8/1/2 rf-channel 0-3

interface Cable8/1/2
downstream Integrated-Cable 8/1/3 rf-channel 0-3

cable fiber-node 155
downstream Integrated-Cable 8/1/2 rf-channel 0-3 
downstream Integrated-Cable 8/1/3 rf-channel 0-3 
upstream Cable 8/1 connector 12

CM is connected with 8/1/2. when CM ranging it locks the primary channel of 8/1/1.