SignaMax SC30010, Справочное руководство CLI

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Chapter 9
| General Security Measures
DHCPv4 Snooping
– 283 –
Related Commands
ip dhcp snooping (274)
ip dhcp snooping trust (286)
ip dhcp snooping
information option
circuit-id
This command specifies DHCP Option 82 circuit-id suboption information. Use
the
no form to use the default settings.
Syntax
ip dhcp snooping information option circuit-id string string |
{ tr101 { node-identifier { ip | sysname } | no-vlan-field }
no dhcp snooping information option circuit-id [ tr101 no-vlan-
field ]
string - An arbitrary string inserted into the circuit identifier field.
(Range: 1-32 characters)
tr101 node-identifier - The remote ID generated by the switch is
based on TR-101 syntax (R-124, Access_Node_ID).
ip - Specifies the switch’s IP address as the node identifier.
sysname - Specifies the system name as the node identifier.
tr101 no-vlan-field - Do not add “:VLAN” in TR101 field for
untagged packets.
Default Setting
VLAN-Unit-Port
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
◆
DHCP provides a relay mechanism for sending information about the
switch and its DHCP clients to the DHCP server. DHCP Option 82 allows
compatible DHCP servers to use the information when assigning IP
addresses, to set other services or policies for clients. For more
information of this process, refer to the Command Usage section under the
ip dhcp snooping information option command.
◆ Option 82 information generated by the switch is based on TR-101 syntax
as shown below:
The circuit identifier used by this switch starts at sub-option1 and goes to the
end of the R-124 string. The R-124 string includes the following information:
Table 56: Option 82 information
82 3-69 1 1-67 x1 x2 x3 x4 x5 x63
opt82 opt-len sub-opt1 string-len R-124 string