Additional sections:
Before configuring D-SBC (S-SBC and M-SBC), you must configure the DNS server for M-SBC with the MGT IPV6 address for Load Balancing Service (LBS). For DSBC SigPort service, DNS server must be configured for M-SBC fixed IPV6 address of packet interface PKT0/PKT1 (if floating IP is not configured on the interface).