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Advertising subnets assigned to clients
This feature enables the route management module to advertise subnets assigned to DHCPv6
clients. This feature achieves symmetric routing for traffic of the same host.
As shown in Figure 104,
Router A and Router B act as both the DHCPv6 server and the BRAS
device. The BRAS devices send accounting packets to the RADIUS server. To enable the BRAS
devices to collect correct accounting information for each RADIUS user, configure the DHCPv6
server to advertise subnets assigned to clients. The upstream and downstream traffic of a RADIUS
user will pass through the same BRAS device.
Figure 104 Network diagram
The subnet advertising on the master device takes effect if the DHCPv6 address pool is bound to a
VSRP instance. If the address pool is applied to a VPN instance, the VPN instance must exist.
To configure the subnet advertisement feature:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Create an address pool and
enter its view.
ipv6 dhcp pool
pool-name
By default, no DHCPv6 address
pools exist.
3. Advertise the subnet assigned
to DHCPv6 clients.
network
{ prefix/prefix-length |
prefix
prefix-number
[ sub-prefix/sub-prefix-length ] }
[
preferred-lifetime
preferred-lifetime
valid-lifetime
valid-lifetime ]
export-route
By default, the subnet assigned
to DHCPv6 clients is not
advertised.
Applying a DHCPv6 address pool to a VPN
instance
If a DHCPv6 address pool is applied to a VPN instance, the DHCPv6 server assigns IPv6 addresses
in this address pool to clients in the VPN instance. Addresses in this address pool will not be
assigned to clients on the public network.
The DHCPv6 server can obtain the VPN instance to which a DHCPv6 client belongs from the
following information:
• The client's VPN information stored in authentication modules, such as IPoE.
• The VPN information of the DHCPv6 server's interface that receives DHCPv6 packets from the
client.
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