Example for Configuring an IPv6 Address Selection Policy Table

This section provides an example for configuring an IPv6 address selection policy table.

Networking Requirements

As shown in Figure 1, the domain name (huawei.com) of Server A maps multiple IPv6 addresses. When DeviceA, as an IPv6 DNS client, accesses Server A by using the domain name (huawei.com), the DNS Server sends all IPv6 addresses of Server A to DeviceA. Then DeviceA queries the IPv6 address selection policy table to select a proper IPv6 address as the destination address of Server A.

Figure 1 Configuring an IPv6 address selection policy table

Interface 1 in this example represents GE 0/1/0.

Configuration Roadmap

The configuration roadmap is as follows:

Configure IPv6 address selection policy entries.
Configure dynamic IPv6 DNS services.

Data Preparation

To complete the configuration, you need the following data:

IPv6 addresses on the interface of DeviceA
Addresses, label values, and precedence values of IPv6 address selection policy entries
IPv6 addresses of the DNS server

Procedure

Configure IPv6 address selection policy entries.

# Configure IPv6 addresses for the interface.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~DeviceA] interface gigabitethernet 0/1/0
[~DeviceA-GigabitEthernet0/1/0] undo shutdown
[*DeviceA-GigabitEthernet0/1/0] ipv6 enable
[*DeviceA-GigabitEthernet0/1/0] ipv6 address fe80::1 link-local
[*DeviceA-GigabitEthernet0/1/0] ipv6 address 2001:db8:fed0:1::2 64
[*DeviceA-GigabitEthernet0/1/0] ipv6 address 2001:db8:2::2 64
[*DeviceA-GigabitEthernet0/1/0] ipv6 address 2001:db8:abcd::77 64
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit

# Configure destination address selection policies.

[~DeviceA] ipv6 address-policy 2001:db8:fed0:1::2 128 100 100
[*DeviceA] ipv6 address-policy 2001:db8:1::1 128 100 100
[*DeviceA] commit

Configure dynamic IPv6 DNS services.

[~DeviceA] dns resolve
[*DeviceA] dns server ipv6 2001:db8:abcd::1234
[*DeviceA] dns domain com
[*DeviceA] commit
[~DeviceA] quit

Verify the configuration.

# Run the ping ipv6 huawei.com command on DeviceA. The command output shows that Server A can be pinged, with the destination IP address 2001:db8:1::1.

<DeviceA> ping ipv6 huawei.com
  Resolved Host (huawei.com -> 2001:db8:1::1)
  PING huawei.com : 56  data bytes, press CTRL_C to break
    Reply from 2001:db8:1::1: bytes=56 Sequence=1 ttl=126 time=6 ms
    Reply from 2001:db8:1::1: bytes=56 Sequence=2 ttl=126 time=4 ms
    Reply from 2001:db8:1::1: bytes=56 Sequence=3 ttl=126 time=4 ms
    Reply from 2001:db8:1::1: bytes=56 Sequence=4 ttl=126 time=4 ms
    Reply from 2001:db8:1::1: bytes=56 Sequence=5 ttl=126 time=4 ms
  --- huawei.com ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 4/4/6 ms

# Run the display ipv6 interface gigabitethernet 0/1/0 command on DeviceA. The command output shows information about the IPv6 address of GE 0/1/0.

<DeviceA> display ipv6 interface gigabitethernet 0/1/0
GigabitEthernet0/1/0 current state : UP  
IPv6 protocol current state : UP 
IPv6 is enabled, link-local address is FE80::1
  Global unicast address(es):
    2001:db8:fed0:1::2, subnet is 2001:db8:fed0:1::/64
    2001:db8:2::2, subnet is 2001:db8:2::/64
    2001:db8:abcd::77, subnet is 2001:db8:abcd::/64
  Joined group address(es):
    FF02::1:FF00:77
    FF02::2 
    FF02::1
    FF02::1:FF00:2
    FF02::1:FF00:1
  MTU is 1500 bytes
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 1200000 milliseconds 
  ND retransmit interval is 1000 milliseconds
  Hosts use stateless autoconfig for addresses

# Run the display ipv6 address-policy all command on DeviceA. The command output shows information about address selection policy entries.

<DeviceA> display ipv6 address-policy all
Policy Table :
             Total:7
-------------------------------------------------------------------------------
 Prefix     : ::                                      PrefixLength  : 0
 Precedence : 40                                      Label         : 1
 Default    : Yes

 Prefix     : 2001:db8:2                              PrefixLength  : 128
 Precedence : 50                                      Label         : 0
 Default    : Yes

 Prefix     : ::FFFF:0.0.0.0                          PrefixLength  : 96
 Precedence : 10                                      Label         : 4
 Default    : Yes

 Prefix     : 2001:db8:1::1                           PrefixLength  : 128
 Precedence : 100                                     Label         : 100
 Default    : No

 Prefix     : 2001::                                  PrefixLength  : 16
 Precedence : 30                                      Label         : 2
 Default    : Yes

 Prefix     : FC00::                                  PrefixLength  : 7
 Precedence : 20                                      Label         : 3
 Default    : Yes

 Prefix     : 2001:db8:fed0:1::2                      PrefixLength  : 128
 Precedence : 100                                     Label         : 100
 Default    : No

-------------------------------------------------------------------------------

Configuration Files

DeviceA configuration file

#
 sysname DeviceA
#
 dns resolve
 dns server ipv6 2001:db8:abcd::1234
 dns domain com
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:abcd::77/64
 ipv6 address 2001:db8:2::2/64
 ipv6 address FE80::1 link-local 
 ipv6 address 2001:db8:fed0:1::2/64
#
 ipv6 address-policy 2001:db8:1::1 128 100 100
 ipv6 address-policy 2001:db8:fed0:1::2 128 100 100
#
return