After PPPoE+ is enabled on the switch, the switch adds vendor-specific information in PADI and PADR packets that it forwards to a PPPoE server. The PPPoE server uses the vendor-specific information to authenticate PPPoE clients. After a PPPoE client is authenticated, the PPPoE server adds vendor-specific information to the PADO and PADS packets sent to the client. The switch sends PADO and PADS packets to the CPU to delete vendor-specific information from the packets.  PPPoE clients are not affected no matter whether vendor-specific information is deleted.
        To save CPU resources, later switch versions do not send PADO and PADS packets received from the PPPoE server to the CPU by default. Instead, ADO and PADS packets are directly forwarded to PPPoE clients by the switch hardware. If PPPoE clients cannot identify vendorspecific information in PADO and PADS packets, run the pppoe intermediate-agent information ignore-reply disable command to configure the switch to send PADO and PADS packets to the CPU.
        In versions earlier than V100R005, the switch sends PADO and PADS packets to the CPU by default. In V100R005 and later versions, the switch does not send PADO and PADS packets to the CPU by default.