TP-Link JetStream T1500-28PCT, Руководство пользователя

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Configuring DHCP Service DHCP
User Guide 397
TP-Link switches preset a default circuit ID and remote ID in TLV (Type, Length, and Value)
format. You can also configure the format to include Value only and customize the Value.
Table 1-1 and Table 1-2 show the packet formats of the Agent Circuit ID and Agent Remote
ID, respectively.
Table 1-1 Packet Formats of the Agent Circuit ID with Different Option 82 Settings
Option 82 Settings
*Type
(Hex)
*Length (Hex) *Value
*Format
Circuit ID
Customization
Normal
(TLV)
Disabled 00 04 Default circuit ID
Enabled 01 Length of the customized circuit ID Customized circuit ID
Private
(Only the
value)
Disabled - - Default circuit ID
Enabled - - Customized circuit ID
Table 1-2 Packet Formats of the Agent Remote ID with Different Option 82 Settings
Option 82 Settings
*Type
(Hex)
*Length (Hex) *Value
*Format
Remote ID
Customization
Normal
(TLV)
Disabled 00 06 Default remote ID
Enabled 01 Length of the customized remote ID Customized remote ID
Private
(Only the
value)
Disabled - - Default remote ID
Enabled - - Customized remote ID
*Format
Indicates the packet format of the sub-option field. Two options are available:
■ Normal: Indicates the field consists of three parts: Type, Length, and Value (TLV).
■ Private: Indicates the field consists of the value only.
*Type
A one-byte field indicating whether the Value field is customized or not. 00 in hexadecimal
means the Value field is not customized (uses the default circuit/remote ID) while 01 in
hexadecimal means it is customized.
*Length
A one-byte field indicating the length of the Value field. The length of the default circuit ID
is 4 bytes and that of default remote ID is 6 bytes. For the customized circuit ID and remote
ID, the length is variable, ranging from 1 to 64 bytes.
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