Migrant user support is only applicable to IPv4. However, if linking is configured for SLAAC or DHCPv6 with DHCPv4 then RS and DHCPv6 messages are dropped till IPv4 ESM host exists (that is, the UE is out of migrant state). After the IPv6 ESM host exists, that is, UE is out of migrant state, RA is sent to the UE (unicast MAC), and subsequent RS or DHCPv6 messages can result in creation of IPv6 ESM host. Therefore, with migrant UEs, linking should be enabled. SLA-profile instance accounting (with interim-updates), and per-host accounting (w/ interim-updates) are supported.