Example for Configuring Distributed MAP-T

This section provides an example for configuring the distributed MAP-T function on the device that functions as the MAP-BR and BRAS.

Networking Requirements

In a distributed scenario shown in Figure 1, both the MAP-BR and BRAS reside on Router A. The BRAS functions as a DHCPv6 server to deliver MAP addresses and mapping rules to MAP-CEs in DHCPv6 IA_PD mode. Router A also functions as a MAP-BR and resides on the edge of a MAP domain. Router A allows the MAP-CEs to access the public IPv4 network through the IPv6 network that is within the MAP domain. In addition, the MAP-CEs can use each other's public IPv4 address to communicate through the MAP-BR.

Figure 1 Networking diagram for configuring MAP-T

Interface1 in this example represents GE0/1/8.

Prerequisites

The MAP license has been loaded to the MAP-BR, and the MAP function has been activated.
The MAP-BR has at least one interface board that supports the MAP function.

Configuration Roadmap

The configuration roadmap is as follows:

Configure BMR rules.
Configure the prefix address and length of a DMR.
Configure an IPv6 prefix pool and address pool.
Configure a MAP-T instance and bind the DMR and BMR rules to the MAP-T instance.
Configure user access.

Data Preparation

To complete the configuration, you need the following data:

BMR name (bmr_name), IPv6 address (2001:db8:1::1), prefix length (48), IPv4 address (1.1.1.0), mask length (24), EA-length (16), and PSID-offset length (4)
DMR name (dmr_name), IPv6 address (2001:db8:3::1), and prefix length (96 bits)
MAP-T instance name (1) and ID (1)

Procedure

Configure a BMR on the BRAS to instruct the BRAS to assign IPv6 and IPv4 addresses to the MAP-CEs. In this example, the IPv6 prefix address assigned to the MAP-CE is 2001:db8:1::1, the prefix length is 48, and the length of the EA-bits is 16. The public IPv4 prefix address allocated to the MAP-CE is 1.1.1.0 and the prefix length is 24. The offset length of the PSID field is 4, which means that ports 0 to 4096 are reserved.
```
<RouterA> system-view
[~RouterA] map rule bmr_name
[*RouterA-map-rule-bmr_name] rule-prefix 2001:db8:1::1 prefix-length 48 ipv4-prefix 1.1.1.0 prefix-length 24 ea-length 16 psid-offset 4
[*RouterA-map-rule-bmr_name] commit
[~RouterA-map-rule-bmr_name] quit
```
Configure a DMR rule on the device and combine the IPv6 prefix configured in the DMR rule with the destination IPv4 address on the MAP-CE to form a destination IPv6 address.
```
[~RouterA] dmr-prefix dmr_name ipv6-prefix 2001:db8:3::1 prefix-length 96
[*RouterA] commit
```
Configure an IPv6 prefix pool and an address pool on the device.
- Configure an IPv6 prefix pool named pre1, bind it to the MAP rule named bmr_name, and assign IPv4 and IPv6 addresses that comply with BMR rules.
```
[~RouterA] ipv6 prefix pre1 delegation
[*RouterA-ipv6-prefix-pre1] map-rule bmr_name
[*RouterA-ipv6-prefix-pre1] commit
[~RouterA-ipv6-prefix-pre1] quit
```
- Configure an IPv6 address pool named pool1 and bind it to the prefix pool named pre1. Bind the prefix dmr_name to the IPv6 address pool so that the BRAS encapsulates the IPv6 prefix as Option 91 information (OPTION_S46_DMR) into the DHCPv6 Response message sent to MAP-CEs.
```
[~RouterA] ipv6 pool pool1 bas delegation
[*RouterA-ipv6-pool-pool1] prefix pre1
[*RouterA-ipv6-pool-pool1] option-s46 dmr-prefix dmr_name
[*RouterA-ipv6-pool-pool1] commit
[~RouterA-ipv6-pool-pool1] quit
```
Configure a MAP-T instance on the device and bind the configured DMR and BMR rules to the MAP-T instance. The DMR rule is used to translate the IPv6 packets imported from the MAP-CE to the MAP-T instance for address translation and bind the BMR rules to encapsulate and verify the packets in the instance.
```
[~RouterA] map-t instance 1 id 1
[*RouterA-map-t-instance-1] dmr-prefix dmr_name
[*RouterA-map-t-instance-1] map-rule bmr_name
[*RouterA-map-t-instance-1] commit
[~RouterA-map-t-instance-1] quit
```

Configure IP addresses of the user- and network-side interfaces on the MAP-BR.

[~RouterA] interface GigabitEthernet0/1/8
[~RouterA-GigabitEthernet0/1/8] ipv6 enable
[*RouterA-GigabitEthernet0/1/8] ipv6 address auto link-local
[*RouterA-GigabitEthernet0/1/8] commit
[~RouterA-GigabitEthernet0/1/8] quit

Configure a user access domain.

[~RouterA] aaa
[*RouterA-aaa] domain map-t
[*RouterA-aaa-map-t] authentication-scheme default0
[*RouterA-aaa-map-t] accounting-scheme default0
[*RouterA-aaa-map-t] commit
[~RouterA-aaa-map-t] ipv6-pool pool1
[~RouterA-aaa-map-t] quit
[~RouterA-aaa] quit

Configure a DUID for the DHCPv6 server.

[~RouterA] dhcpv6 duid llt
[*RouterA] commit

Configure IPoEv6 access.

[~RouterA] interface GigabitEthernet0/1/8
[*RouterA-GigabitEthernet0/1/8] bas
[*RouterA-GigabitEthernet0/1/8-bas] access-type layer2-subscriber default-domain authentication map-t
[~RouterA-GigabitEthernet0/1/8-bas] authentication-method-ipv6 bind
[*RouterA-GigabitEthernet0/1/8-bas] commit

Router A Configuration File

#
dmr-prefix dmr_name ipv6-prefix 2001:db8:3::1 prefix-length 96
#
map rule bmr_name
 rule-prefix 2001:db8:1::1 prefix-length 48 ipv4-prefix 1.1.1.0 prefix-length 24 ea-length 16 psid-offset 4
#
map-t instance 1 id 1
 dmr-prefix dmr_name
 map-rule bmr_name
#
ipv6 prefix pre1 delegation
 map rule bmr_name
ipv6 pool pool1 bas delegation
 prefix pre1
 option-s46 dmr-prefix dmr_name
#
aaa
 domain map-t
  authentication-scheme default0
  accounting-scheme default0
  ipv6-pool pool1
#
dhcpv6 duid 0001000125a7625df063f9761497
#
interface GigabitEthernet0/1/8
 undo negotiation auto
 undo shutdown
 ipv6 enable
 ipv6 address auto link-local
 bas
  access-type layer2-subscriber default-domain authentication map-t
  authentication-method-ipv6 bind
#