MAP-T rules control the address translation in a MAP-T domain. The mapping rules can be delivered to the devices in the MAP domain using RADIUS or DHCP, or be statically provisioned.
The MAP-T rules are:
Basic Mapping Rule (BMR)
The BMR is used to translate the public IPv4 address and port-range assigned to the CE into the IPv6 MAP address. It is composed of the following parameters:
rule IPv6 prefix (including prefix length)
rule IPv4 prefix (including prefix length)
rule Embedded Address bits (EA-bits) define the portion of the IA-PD that encodes the IPv4 suffix and port-range
rule Port Parameters (optional)
Forwarding Mapping Rule (FMR)
The FMR is used for forwarding within the MAP domain. FMRs are instantiated in the BR so that the BR can forward traffic to the CEs. FMRs can also be instantiated in CEs to forward traffic directly between CEs, effectively bypassing BR. The FMR is composed of the same set of parameters as the BMR:
rule IPv6 prefix (including prefix length)
rule IPv4 prefix (including prefix length)
rule Embedded Address (EA) bits that define the portion of the IA-PD that encodes the IPv4 suffix and port-range
rule Port Parameters (optional)
Default Mapping Rule (DMR)
The DMR is used to forward traffic outside the MAP domain. This rule contains the IPv6 prefix of the BR in MAP-T and it is used as the default route.