Users Guide

Table Of Contents
port-channel id-number - Enter the port channel interface type.
vlan vlan-id - Enter the VLAN interface type.
virtual-network vn-id - Enter the virtual network type.
Defaults No source-interface configuration on the VRF and the client connected interface IP address is used by
the relay for forwarding.
Command Mode IP VRF
Usage
Information
When you configure the DHCP-relay source interface for a given VRF, all the DHCP client-facing
interfaces associated with the VRF use this interface IP in the giaddr field to forward the packets
to and from the DHCP server.
The DHCP server uses the IP address of that source interface as destination for RELAY-REPLY packets.
We can configure a unique source-interface for the DHCP client facing interfaces (apart from the one
configured at the VRF level), by using the interface level source-interface command.
The source-interface IP address takes precedence for the giaddr field even if an interface IP address or
virtual anycast gateway IP address is present on the interface.
NOTE: You must enable the link-selection option globally to allocate the IP address on the client
subnet if the client-connected interface IP address and source interface IP address are in different
network domain.
This command is restricted to netadmin and sysadmin role users.
Example
OS10(conf-vrf)# ip dhcp-relay source-interface
ethernet Ethernet interface type
loopback Loopback interface type
port-channel Port-channel interface type
vlan Vlan interface type
virtual-network virtual network type
OS10(conf-vrf)# ip dhcp-relay source-interface loopback 1
Supported
Releases
10.5.2 or later
ip dhcp-relay server-override
Enables server identifier override (suboption-11) globally on the relay agent.
Syntax
ip dhcp-relay server-override
Parameters None.
Defaults Disabled on the relay agent.
Command Mode CONFIGURATION
Usage
Information
Enabling the server identifier option on the relay agent allows the DHCP relay agent to act as the proxy
DHCP server such that the renew requests from the clients come to the relay agent rather than the
DHCP server directly.
Enabling the CLI at global level enables the server-override option on all the DHCP client-facing interfaces
by default. In order to disable the server-override option for specific client facing interfaces, configure no
ip dhcp-relay server-override command on them.
NOTE: Option-82 must be enabled Globally and at the interface level to activate the server-override
feature support.
This command is restricted to netadmin and sysadmin role users.
Example
OS10(conf)# ip dhcp-relay server-override
302 System management