ZyXEL Communications VES1724-56 - Sub-Option Format; PPPoE IA Configuration Options

Chapter 32 PPPoE IA
VES1724-56 User’s Guide
289
32.1.2 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.
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 puts the
PPPoE client’s MAC address into the Agent Remote ID Sub-option if you do not specify any user-
defined string.
32.1.2.1 WT-101 Default Circuit ID Syntax
If you do not configure a Circuit ID string, 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”.
32.1.3 PPPoE IA Configuration Options
The PPPoE IA configuration on the Switch is divided into Global and VLAN screens. The screen you
should use for configuration depends on the PPPoE discovery packets to which you want to add
subscriber line specific information on your network. Choose the configuration screen based on the
following criteria:
• Global: The Switch adds the same subscriber line specific information to all PPPoE discovery
packets it receives.
• VLAN: The Switch is configured on a per-VLAN basis. The Switch can be configured to add
different subscriber line specific information to PPPoE discovery packets in different VLANs.
Table 130 PPPoE IA Circuit ID Sub-option Format: User-defined String
SubOpt Length Value
0x01
(1 byte)
N
(1 byte)
String
(63 bytes)
Table 131 PPPoE IA Remote ID Sub-option Format
SubOpt Length Value
0x02
(1 byte)
N
(1 byte)
MAC Address or String
(63 bytes)
Table 132 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
(3
byte)
Space
(1
byte)
Slot
ID
(1
byte)
/
(1
byte)
Port No
(2
byte)
:
(1
byte)
VLAN ID
(4
bytes)