Enabling Or Disabling Vrf Support For The Dhcp Relay Agent - Cisco Nexus 9000 Series Configuration Manual

Enabling or Disabling VRF Support for the DHCP Relay Agent

DETAILED STEPS
Command or Action
Step 1 switch# configure terminal
Step 2 switch(config)# [no] ip dhcp relay information option
Step 3 (Optional) switch(config)# [no] ip dhcp relay sub-option
circuit-id customized
Step 4
(Optional) switch(config)# [no] ip dhcp relay sub-option
circuit-id format-type string
Step 5 (Optional) switch(config)# show ip dhcp relay
Step 6 (Optional) switch(config)# show running-config dhcp
Step 7
(Optional) switch(config)# copy running-config
startup-config
Enabling or Disabling VRF Support for the DHCP Relay Agent
You can configure the device to support the relaying of DHCP requests that arrive on an interface in one VRF
to a DHCP server in a different VRF.
Before you begin
You must enable Option 82 for the DHCP relay agent.
Cisco Nexus 9000 Series NX-OS Security Configuration Guide, Release 9.x
350
Purpose
Enters global configuration mode.
Enables the DHCP relay agent to insert and remove Option
82 information on the packets that it forwards. The Option
82 information is in binary ifindex format by default. The
no option disables this behavior.
Programs Option 82 with the VLAN + slot + port format.
This command is applicable only for SVIs. The no option
disables this behavior.
Configures Option 82 to use encoded string format instead
of the default binary ifindex format. The no option disables
this behavior.
For VLANs and SVIs:
• When this command and the ip dhcp relay sub-option
circuit-id customized command are both configured,
the ip dhcp relay sub-option circuit-id format-type
string command is programmed.
• When the ip dhcp relay sub-option circuit-id
format-type string command is removed, the ip dhcp
relay sub-option circuit-id customized command is
programmed.
• When both commands are removed, the ifindex is
programmed.
For other interfaces, if the ip dhcp relay sub-option
circuit-id format-type string command is configured, it
is used. Otherwise, the default ifindex is programmed.
Displays the DHCP relay configuration.
Displays the DHCP configuration.
Saves the change persistently through reboots and restarts
by copying the running configuration to the startup
configuration.
Configuring DHCP