Advertising subnets assigned to clients
This feature enables the route management module to advertise subnets assigned to DHCP clients. This feature achieves symmetric routing for traffic of the same host.
As shown in Figure 19, Router A and Router B act as both the DHCP 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 DHCP server to advertise subnets assigned to clients. The upstream and downstream traffic of a RADIUS user will pass through the same BRAS device.
Figure 19: Network diagram
The subnet advertising on the master device takes effect if the DHCP 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 a DHCP address pool and enter its view. | dhcp server ip-pool pool-name | By default, no DHCP address pool exists. |
3. Advertise subnets assigned to DHCP clients. | network network-address [ mask-length | mask mask ] export-route [ secondary ] | By default, the subnets assigned to DHCP clients are not advertised. |