D-Link DXS-3600 Series Cli Reference Manual page 336

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
Level: 12.
Usage Guideline
When IP DHCP relay information trust option is enabled on an interface, the arriving packets with a
GIADDR of 0 (this relay agent is the first relay of this DHCP request packet) but with relay agent
information option present will be accepted. If it is not trusted, these packets will be dropped.
When this command's setting is enabled, IP DHCP relay information is trusted for all interfaces. When
this command's setting is disabled, the trust state is determined by the interface mode command ip dhcp
relay information trusted.
Verify settings by entering the show ip dhcp relay information trusted-sources command.
Example
This example shows how to enable the DHCP relay agent to trust IP DHCP relay information for all
interfaces. The DHCP relay agent trusts the relay information for all interfaces regardless of what the
setting of ip dhcp relay information trusted command.
Switch# configure terminal
Switch(config)# ip dhcp relay information trust-all
Switch(config)#
21-11 ip dhcp relay information trusted
This command is used to enable the DHCP relay agent to trust the relay information for the interface. Use
the no command to disable the trusting of relay information for the interface.
ip dhcp relay information trusted
no ip dhcp relay information trusted
Parameters
None.
Default
By default, information is not trusted.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
When IP DHCP relay information is trusted on an interface, the arriving packets with the GIADDR of 0
(this relay agent is the first relay of this DHCP request packet) but with relay agent information option
present will be accepted. If it is not trusted, these packets will be dropped.
When the IP DHCP relay information trust-all command setting is enabled, IP DHCP relay information is
trusted for all interfaces. When this command setting is disabled, the trust state is determined by the
interface mode command ip dhcp relay information trusted.
Verify the settings by entering the show ip dhcp relay information trusted-sources command.
Example
This example shows how to disable the DHCP relay agent to trust all interface settings and enable trust
for VLAN 100.
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