ZyXEL MES3500-24F User Guide - Page 250
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Chapter 31 PPPoE Table 95 PPPoE IA Remote ID Sub-option Format SubOpt 0x02 (1 byte) Length N (1 byte) MAC Address or String (63 bytes) Value The 1 in the first field identifies this as an Agent Circuit ID sub-option and 2 identifies this as an Agent Remote ID sub-option. The next field specifies the length of the field. The Switch takes the Circuit ID string you manually configure for a VLAN on a port as the highest priority and the Circuit ID string for a port as the second priority. In addition, the Switch puts the PPPoE client's MAC address into the Agent Remote ID Sub-option if you do not specify any user-defined string. 31.1.2.1 Flexible Circuit ID Syntax with Identifier String and Variables If you do not configure a Circuit ID string for a VLAN on a specific port or for a specific port, the Switch adds the user-defined identifier string and variables into the Agent Circuit ID Sub-option. The variables can be the slot ID of the PPPoE client, the port number of the PPPoE client and/or the VLAN ID on the PPPoE packet. The identifier-string, slot ID, port number and VLAN ID are separated from each other by a pound key (#), semi-colon (;), period (.), comma (,), forward slash (/) or space. An Agent Circuit ID Suboption example is "Switch/07/0123" and indicates the PPPoE packets come from a PPPoE client which is connected to the Switch's port 7 and belong to VLAN 123. Table 96 PPPoE IA Circuit ID Sub-option Format: Using Identifier String and Variables SubOpt 0x01 (1 byte) Length N (1 byte) Identifier String (53 byte) delimiter (1 byte) Slot ID (1 byte) Value delimiter (1 byte) Port No (2 byte) delimiter (1 byte) VLAN ID (4 bytes) 31.1.2.2 WT-101 Default Circuit ID Syntax If you do not configure a Circuit ID string for a specific VLAN on a port or for a specific port, and disable the flexible Circuit ID syntax in the PPPoE > Intermediate Agent screen, the Switch automatically generates a Circuit ID string according to the default Circuit ID syntax which is defined in the DSL Forum Working Text (WT)-101. The default access node identifier is the host name of the PPPoE intermediate agent and the eth indicates "Ethernet". Table 97 PPPoE IA Circuit ID Sub-option Format: Defined in WT-101 SubOpt 0x01 (1 byte) Length N (1 byte) Access Node Identifier (20 byte) Space eth (1 (3 byte) byte) Value Space (1 byte) Slot ID (1 byte) / (1 byte) Port No (2 byte) : (1 byte) VLAN ID (4 bytes) 31.1.3 Port State Every port is either a trusted port or an untrusted port for the PPPoE intermediate agent. This setting is independent of the trusted/untrusted setting for DHCP snooping or ARP inspection. You can also specify the agent sub-options (circuit ID and remote ID) that the Switch adds to PADI and PADR packets from PPPoE clients. 250 MES3500-24/24F User's Guide