Chapter 9
| General Security Measures
DHCPv4 Snooping
– 343 –
EXAMPLE
This example enables the use of sub-type and sub-length fields for the
circuit-ID (CID) and remote-ID (RID).
Console(config)#no ip dhcp snooping information option encode no-subtype
Console(config)#
ip dhcp snooping
information option
remote-id
This command sets the remote ID to the switch’s IP address, MAC address, arbitrary
string, or TR-101 compliant node identifier. Use the no form to restore the default
setting.
Syntax
ip dhcp snooping information option remote-id
{ip-address [encode {ascii | hex}] |
mac-address [encode {ascii | hex}] | string string |
tr101 node-identifier {ip | sysname}]
no ip dhcp snooping information option remote-id
[ip-address encode] | [mac-address encode]
mac-address - Inserts a MAC address in the remote ID sub-option for the
DHCP snooping agent (that is, the MAC address of the switch’s CPU).
ip-address - Inserts an IP address in the remote ID sub-option for the DHCP
snooping agent (that is, the IP address of the management interface).
encode - Indicates encoding in ASCII or hexadecimal.
string - An arbitrary string inserted into the remote 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
MAC address (hexadecimal)
Command Mode
Global Configuration
Example
This example sets the remote ID to the switch’s IP address.
Console(config)#ip dhcp snooping information option remote-id tr101
node-identifier ip
Console(config)#
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