relay information option allow-untrusted (BNG)
To configure the Dynamic Host Configuration Protocol (DHCP) IPv4 relay or DHCP snooping Relay not to
drop discard BOOTREQUEST packets that have the relay information option set and the giaddr set to zero,
use the relay information option allow-untrusted command in DHCP IPv4 relay profile configuration
submode or DHCP IPv4 profile snoop configuration submode. To restore the default behavior, which is to
discard the BOOTREQUEST packets that have the relay information option and set the giaddr set to zero,
use the no form of this command.
relay information option allow-untrusted
no relay information option allow-untrusted
Syntax Description
This command has no keywords or arguments.
Command Default
The packet is dropped if the relay information is set and the giaddr is set to zero.
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
According to RFC 3046, relay agents (and servers) receiving a DHCP packet from an untrusted circuit with
giaddr set to zero but with a relay agent information option already present in the packet shall discard the
packet and increment an error count. This configuration prevents the server or relay from dropping the DHCP
message.
Task ID
OperationsTask ID
read, writeip-services
read, writebasic-services
Examples
This example shows how to use the relay information option allow-untrusted command:
RP/0/RSP0/CPU0:router# config
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Command Reference, Release
5.2.x
189
BNG DHCP Commands
relay information option allow-untrusted (BNG)
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