Chapter 9
| General Security Measures
DHCPv4 Snooping
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Example
This example enables DHCP snooping for VLAN 1.
Console(config)#ip dhcp snooping vlan 1
Console(config)#
Related Commands
ip dhcp snooping (339)
ip dhcp snooping trust (348)
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 dhcp snooping information option circuit-id
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.
Default Setting
VLAN-Unit-Port
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
â—† 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.
â—† Option 82 information generated by the switch is based on TR-101 syntax as
shown below:
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