Example for Configuring Distributed MAP-T
This section provides an example for configuring the distributed MAP-T function and the functions as the MAP-BR and BRAS.
Networking Requirements
In a distributed scenario shown in Figure 3-6, 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. (In this example, only key configurations of IPv6 address assignment are provided. For details, see HUAWEI NE20E-S Universal Service Router Configuration Guide - User Access - IPv6 Address Management Configuration.) 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.
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 a MAP-E instance and bind the DMR and BMR rules to the MAP-E instance.
- Configure an IPv6 prefix pool and an IPv6 address pool.
Data Preparation
BMR name (bmr_name), IPv6 address (1111::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 (1234::1), and prefix length (96 bits)
MAP-T instance name (1) and ID (1)
Interface1's IPv6 address (2222::1), IPv6 mask length (64 bits), IPv4 address (10.1.1.1), and IPv4 mask length (24 bits)
Interface2's IPv4 address (11.1.1.1) and mask length (24 bits)
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 1111::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 1111::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 1234::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 into Option 91 information (OPTION_S46_DMR) carried in the DHCPv6RESPONSE packet 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 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.
- 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 GigabitEthernet10/2/0 [~RouterA-GigabitEthernet0/2/0] ipv6 enable [*RouterA-GigabitEthernet0/2/0] ipv6 address 2222::1 64 [*RouterA-GigabitEthernet0/2/0] ip address 10.1.1.1 24 [*RouterA-GigabitEthernet0/2/0] commit [~RouterA-GigabitEthernet0/2/0] quit [~RouterA] interface GigabitEthernet0/2/1 [~RouterA-GigabitEthernet0/2/1] ip address 11.1.1.1 24 [*RouterA-GigabitEthernet0/2/1] commit [~RouterA-GigabitEthernet0/2/1] quit [~RouterA] quit
Router A Configuration File
# dmr-prefix dmr_name ipv6-prefix 1234::1 prefix-length 96 # map rule bmr_name rule-prefix 1111::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 delegation prefix pre1 option-s46 dmr-prefix dmr_name # interface GigabitEthernet0/2/0 undo negotiation auto undo shutdown ipv6 enable ip address 10.1.1.1 255.255.255.0 ipv6 address 2222::/64 # interface GigabitEthernet0/2/1 undo negotiation auto undo shutdown control-flap ip address 11.1.1.1 255.255.255.0 # ipv6 route-static 1111::1 48 2222::1 #
