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Chapter 31 DHCP
GS1350 Series User’s Guide
243
31.4.1 DHCPv4 Relay Agent Information
The Switch can add information about the source of client DHCP requests that it relays to a DHCP server
by adding
Relay Agent Information
. This helps provide authentication about the source of the requests.
The DHCP server can then provide an IP address based on this information. Please refer to RFC 3046 for
more details.
The DHCP
Relay Agent Information
feature adds an Agent Information field (also known as the
Option
82
field) to DHCP requests. The
Option 82
field is in the DHCP headers of client DHCP request frames that
the Switch relays to a DHCP server.
Relay Agent Information
can include the
System Name
of the Switch if you select this option. You can
change the
System Name
in
Basic Settings
>
General Setup
.
The following describes the DHCP relay agent information that the Switch sends to the DHCP server:
31.4.1.1 DHCPv4 Relay Agent Information Format
A DHCP Relay Agent Information option has the following format.
i1, i2 and iN are DHCP relay agent sub-options, which contain additional information about the DHCP
client. You need to define at least one sub-option.
31.4.1.2 Sub-Option Format
There are 2 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 two identifies this as an Agent
Remote ID sub-option. The next field specifies the length of the field.
Table 113 Relay Agent Information
FIELD LABELS
DESCRIPTION
Slot ID
(1 byte) This value is always 0 for stand-alone switches.
Port ID
(1 byte) This is the port that the DHCP client is connected to.
VLAN ID
(2 bytes) This is the VLAN that the port belongs to.
Information
(up to 64 bytes) This optional, read-only field is set according to system name set in
Basic
Settings
>
General Setup
.
Table 114 DHCP Relay Agent Information Option Format
Code
(82)
Length
(N)
i1
i2
...
iN
Table 115 DHCP Relay Agent Circuit ID Sub-option Format
SubOpt Code
Length
Value
1
(1 byte)
N
(1 byte)
Slot ID, Port ID, VLAN ID, System Name or String
Table 116 DHCP Relay Agent Remote ID Sub-option Format
SubOpt Code
Length
Value
2
(1 byte)
N
(1 byte)
MAC Address or String
Содержание GS1350 Series
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Страница 291: ...GS1350 Series User s Guide 291 Figure 218 Example Lock Denoting a Secure Connection EXAMPLE ...
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