Chapter 32 PPPoE

32.2.1.2 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 106 PPPoE IA Circuit ID Sub-option Format: Defined in WT-101

SubOpt Length

Value

0x01

N

Access

Space

eth

Space

Slot

(1 byte)

(1 byte)

Node

(1

(3

(1

ID

Identifier

 

 

 

byte)

byte)

byte)

(1

 

 

 

 

 

(20 byte)

 

 

 

byte)

 

 

 

 

 

 

 

/

Port No

:

VLAN

(1

(2

(1

ID

 

byte)

byte)

byte)

(4

 

 

 

bytes)

 

 

 

 

32.2.2 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.

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ZyXEL Communications metrogigabit switch manual Port State, 319, 32.2.1.2 WT-101 Default Circuit ID Syntax
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metrogigabit switch specifications

ZyXEL Communications has long been a prominent player in the networking hardware industry, providing innovative solutions that cater to both business and consumer markets. Among their notable offerings is the Metrogigabit switch, a device designed to meet the high demands of modern networks.

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