ZyXEL XGS4700-48F User Guide - Page 302
Sub-Option Format
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Chapter 31 PPPoE 31.1.2 Sub-Option Format There are two types of sub-option: "Agent Circuit ID Sub-option" and "Agent Remote ID Sub-option". They have the following formats. Table 96 PPPoE IA Circuit ID Sub-option Format: User-defined String SubOpt 0x01 (1 byte) Length N String (1 byte) (63 bytes) Value Table 97 PPPoE IA Remote ID Sub-option Format SubOpt 0x02 (1 byte) Length N MAC Address or String (1 byte) (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 Sub-option 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 98 PPPoE IA Circuit ID Sub-option Format: Using Identifier String and Variables SubOpt 0x01 (1 byte) Length N (1 byte) Identifier String (53 byte) Value delimiter Slot ID delimiter Port No delimiter VLAN ID (1 byte) (1 byte) (1 byte) (2 byte) (1 byte) (4 bytes) 302 XGS4700-48F User's Guide