ZyXEL Communications MSC1000G Series, User Manual

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Chapter 4 Access Control List Screens
Management Switch Card User’s Guide
82
The Agent Information field that the MSC adds also contains an “Agent Remote-ID sub-option” of
information that you specify.
The following table shows the format of the private Agent Remote ID sub-option. The “2” in the first
field identifies this as an Agent Remote ID sub-option. The length
N gives the total number of
octets in the Agent Information Field. Next, the extra information field ( A in the table) contains
from 0 to 23 bytes of optional information (that you specify) with no spaces and no termination
character (if you do not specify any information, this field contains no data). Next, there is a space
and the letters “eth” followed by another space. Then there is the slot number and port number (in
plain text format) upon which the DHCP client request was received. This is followed by a colon (:),
the VLAN ID (VID) number, a period (.) and the MAC address (in hexadecimal format).
4.1.3 TR-101 Format
The Agent Information field that the management switch card adds contains an “Agent Circuit-ID
sub-option” that 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 Agent Circuit ID 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”.
TR-101 uses the same remote ID sub-option format as the Private format.
4.1.4 PPPoE Intermediate Agent
Note: You must use CLI commands to configure this feature.
Table 10
DHCP Relay Agent Remote ID Sub-option Format: Private
2 N A “eth “ Slot No. / Port No. : VLAN ID . MAC
Table 11
DHCP Relay Agent Circuit ID Sub-option Format: TR-101 (VID on)
1 N hostname / A / IP “atm “ Slot ID / Port No. : VPI . VCI : VLAN ID
Table 12
DHCP Relay Agent Circuit ID Sub-option Format: TR-101 (VID off)
1 N hostname / A / IP “atm “ Slot ID / Port No. : VPI . VCI