ZyXEL Communications SAM1316-22, User Manual

Page: 238 / 464

Chapter 36 PPPoE Intermediate Agent
SAM1316-22 User’s Guide
238
The SAM1316-22 adds the slot ID of the PPPoE client, the port number of the
PPPoE client, the VLAN ID on the PPPoE packet, and any extra information (for
example, the device name) into the Agent Circuit ID Sub-option. In addition, the
SAM1316-22 puts the PPPoE client’s MAC address into the Agent Remote ID Sub-
option. The slot ID is zero, if this value is not applicable. If the SAM1316-22 adds
extra information, it does not append a trailing 0x00 (00h).
36.1.0.2 TR-101 Format
The PPPoE Intermediate Agent sub-option includes the system name or IP
address, slot ID, port number, VPI, and VCI on which the TCP/IP configuration
request was received.
The following figure shows the format of the TR-101 PPPoE Intermediate Agent
sub-option. The 1 in the first field identifies this as an Agent Circuit ID sub-option.
The next field specifies the length of the field. The hostname field displays the
system name, if it has been configured, the extra information field (A) if the
hostname was not configured, or the IP address in dotted decimal notation
(w.x.y.z), if neither the system name nor the extra information field was been
configured. In either case, the hostname is truncated to 23 characters, and
trailing spaces are discarded. The hostname field is followed by a space, the string
“atm”, and another space. Then, a 1-byte Slot ID field specifies the ingress slot
number, and a 1-byte Port No field specifies the ingress port number. Next, the
VPI and VCI denote the virtual circuit that received the DHCP request message
from the subscriber. If the VID is turned on, there is a colon and then the VLAN ID
(1 ~ 4094). If the VID is turned off, there is neither colon nor VID.
The slot ID, port number, VPI, VCI and MAC are separated from each other by a
forward slash (/) colon (:) or period (.). An example is “SYSNAME atm 3/
10:0.33:12”.
Unlike the private format for PPPoE intermediate agent, the TR-101 format for
PPPoE intermediate agent does not include the Remote ID sub-option.
Table 87 PPPoE Intermediate Agent Sub-option Format: TR-101 (VID on)
1 N hostname / A / IP “ atm “ Slot ID / Port No. : VPI . VCI : VLAN ID
Table 88 PPPoE Intermediate Agent Sub-option Format: TR-101 (VID off)
1 N hostname / A / IP “ atm “ Slot ID / Port No. : VPI . VCI