ZyXEL GS1920 Series User Guide - Page 233
WT-101 Default Circuit ID Syntax, Port State
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Chapter 28 PPPoE 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 107 PPPoE IA Circuit ID Sub-option Format: Using Identifier String and Variables SubOpt Length Value 0x01 N (1 byte) (1 byte) Identifier String (53 byte) delimiter (1 byte) Slot ID delimiter (1 byte) (1 byte) Port No delimiter (2 byte) (1 byte) VLAN ID (4 bytes) 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 108 PPPoE IA Circuit ID Sub-option Format: Defined in WT-101 SubOpt Length Value 0x01 (1 byte) N (1 byte) Access Node Identifier (20 byte) Space (1 byte) eth Space (3 (1 byte) byte) Slot ID (1 byte) / (1 byte) Port No (2 byte) : (1 byte) VLAN ID (4 bytes) 28.1.2.3 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. Trusted ports are connected to PPPoE servers. • If a PADO (PPPoE Active Discovery Offer), PADS (PPPoE Active Discovery Session-confirmation), or PADT (PPPoE Active Discovery Terminate) packet is sent from a PPPoE server and received on a trusted port, the Switch forwards it to all other ports. • If a PADI or PADR packet is sent from a PPPoE client but received on a trusted port, the Switch forwards it to other trusted port(s). Note: The Switch will drop all PPPoE discovery packets if you enable the PPPoE intermediate agent and there are no trusted ports. Untrusted ports are connected to subscribers. • If a PADI, PADR, or PADT packet is sent from a PPPoE client and received on an untrusted port, the Switch adds a vendor-specific tag to the packet and then forwards it to the trusted port(s). • The Switch discards PADO and PADS packets which are sent from a PPPoE server but received on an untrusted port. GS1920 Series User's Guide 233