Chapter 9
| General Security Measures
DHCPv4 Snooping
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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)#
ip dhcp snooping
information option
tr101 board-id
This command sets the board identifier used in Option 82 information based on
TR-101 syntax. Use the no form to remove the board identifier.
Syntax
ip dhcp snooping information option tr101 board-id board-id
no ip dhcp snooping information option tr101 board-id
board-id – TR101 Board ID. (Range: 0-9)
Default Setting
not defined
Command Mode
Global Configuration
Example
This example sets the board ID to 0.
Console(config)#ip dhcp snooping information option tr101 board-id 0
Console(config)#
information policy This command sets the DHCP snooping information option policy for DHCP client
packets that include Option 82 information. Use the no form to restore the default
setting. Use the no form to restore the default setting.
Syntax
ip dhcp snooping information policy {drop | keep | replace}
no ip dhcp snooping information policy
drop - Drops the client’s request packet instead of relaying it.
keep - Retains the Option 82 information in the client request, and
forwards the packets to trusted ports.
replace - Replaces the Option 82 information circuit-id and remote-id fields
in the client’s request with information about the relay agent itself, inserts
the relay agent’s address (when DHCP snooping is enabled), and forwards
the packets to trusted ports.
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