384Configuring IPoEAbout IPoEIP over Ethernet (IPoE) enables a BRAS to connect and authenticate users over IPoE connections.As shown in Figure 141, a BRAS connects hosts over IPoE connections, and provides AAA, security,and DHCP services for the hosts. This solution does not require the hosts to install any clientsoftware.Figure 141 IPoE network diagramIPoE access modesIPoE supports Layer 2 and Layer 3 access modes.• Layer 2 access modeHosts directly access the BRAS. The hosts connect to the BRAS directly or through Layer 2devices. The BRAS uses MAC addresses to identify the hosts.• Layer 3 access modeHosts use routing to access the BRAS. The hosts connect to the BRAS directly or throughLayer 3 devices. When a Layer 3 device resides between the hosts and the BRAS, the sourceMAC address of packets received by the BRAS is the MAC address of the Layer 3 device.Therefore, the BRAS uses IP addresses or VLAN IDs to identify hosts.IPoE usersIPoE users include individual users and leased users.Individual usersIndividual users use independent IPoE services. The BRAS authenticates, authorizes, and billsindividual users based on user location and packet information. Individual users include dynamic andstatic individual users.
