438[Device-isp-dm1] quitd. Configure IPoE:# Enable IPoE and configure Layer 3 access mode on GigabitEthernet 3/1/2.[Device] interface gigabitethernet 3/1/2[Device–GigabitEthernet3/1/2] ip subscriber routed enable# Enable the unclassified-IP user.[Device–GigabitEthernet3/1/2] ip subscriber initiator unclassified-ip enable# Specify dm1 as the ISP domain.[Device–GigabitEthernet3/1/2] ip subscriber unclassified-ip domain dm1# Configure plaintext password radius for authentication.[Device–GigabitEthernet3/1/2] ip subscriber password plaintext radius# Configure online detection:− Use ICMP detection mode.− Set the maximum number of detection attempts to 2.− Set the detection interval to 30 seconds.[Device–GigabitEthernet3/1/2] ip subscriber user-detect icmp retry 2 interval 30[Device–GigabitEthernet3/1/2] quitVerifying the configurationUse the display ip subscriber session command to verify that the BRAS deletes the IPoE sessionafter the user goes offline.Troubleshooting IPoEDHCP clients failed to come onlineSymptomDHCP clients cannot come online, although network connections and interface IPoE configurationsare correct.SolutionTo solve the problem:1. Use debug commands or a packet analyzer to check DHCP packets from the DHCP client.By default, DHCPv4 and DHCPv6 clients use ISP domains specified in Option 60 and Option16/Option 17, respectively.2. If the DHCPv4 packet carries Option 60 or the DHCPv6 packet carries Option 16 or Option 17,verify that the ISP domain in the option exists on the BRAS.3. If the DHCP packet does not carry Option 60 or Option 16/Option 17, verify that the ISP domainspecified on the interface exists on the BRAS.4. If the problem persists, contact H3C Support.
