relay information option (BNG)
To configure Dynamic Host Configuration Protocol (DHCP) IPv4 relay or DHCP snooping Relay to insert
relay agent information option in forwarded BOOTREQUEST messages to a DHCP server, use the relay
information option command in DHCP IPv4 relay profile relay configuration or DHCP IPv4 profile snoop
submode. To disable inserting relay information into forwarded BOOTREQUEST messages, use the no form
of this command.
relay information option
no relay information option
Syntax Description
This command has no keywords or arguments.
Command Default
None
Command Modes
DHCP IPv4 relay profile relay configuration
DHCP IPv4 profile snoop configuration
Command History
ModificationRelease
This command was introduced.Release 3.7.2
This command was supported for BNG.Release 4.2.0
Usage Guidelines
The relay information option command automatically adds the circuit identifier suboption and the remote
ID suboption to the DHCP relay agent information option.
The relay information option command enables a DHCP server to identify the user (for example, cable
access router) sending the request and initiate appropriate action based on this information. By default, DHCP
does not insert relay information.
If the information option command is enabled, DHCP snooping mode does not set the giaddr field in the
DHCP packet.
The upstream DHCP server or DHCP relay interface must be configured to accept this type of packet using
the relay information option allow-untrusted configuration. This configuration prevents the server or relay
from dropping the DHCP message.
Task ID
OperationsTask ID
read, writeip-services
read, writebasic-services
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Command Reference, Release
5.2.x
187
BNG DHCP Commands
relay information option (BNG)
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