Chapter 9
| General Security Measures
DHCPv4 Snooping
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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. Use the no form to
restore the default setting.
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)#
ip dhcp snooping
information policy
This command sets the DHCP snooping information option policy for DHCP client
packets that include Option 82 information.
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.
Default Setting
replace
Command Mode
Global Configuration
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