Administrator Guide

Usage Information
You can add multiple DHCP servers by entering the ip helper-address command multiple times. If multiple
servers are defined, an incoming request is sent simultaneously to all configured servers and the reply is forwarded
to the DHCP client.
The system uses standard DHCP ports, that is UDP ports 67 (server) and 68 (client) for DHCP relay services. It
listens on port 67 and if it receives a broadcast, the software converts it to unicast, and forwards to it to the
DHCP-server with source port=68 and destination port=67.
The server replies with source port=67, destination port=67 and the system forwards to the client with source
port=67, destination port=68.
ipv6 helper-address
Configures the IPv6 DHCP helper addresses.
C9000 Series
Syntax
[no] ipv6 helper-address [vrf vrf-name] ipv6-address
To delete the ipv6 helper address, use the [no] ipv6 helper-address [vrf vrf-name] ipv6-
address command.
Parameters
vrf vrf-name (Optional) Enter the keywork vrf and then the name of the VRF through which the host
address can be reached.
ipv6-address Enter the keywordipv6–address through which the server address can be reached.
Default Disabled.
Command Modes INTERFACE
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.14(1.0) Enhanced to support non-default VRF configuration for DHCPv6 helper address.
9.9(0.0) Introduced on the C9010.
9.7(0.0) Introduced on the S4810, S4820T, S6000, S6000–ON, Z9000, and Z9500.
Usage Information
Use this command on the interfaces where the DHCP clients are connected to forward the packets from clients
to DHCP server and vice-versa.
Example
Dell(conf-if-te-0/0)#ipv6 helper-address
X:X:X:X::X IPv6 helper address
VRF VRF name.
lease
Specify a lease time for the addresses in a pool.
C9000 Series
Syntax
lease {days [hours] [minutes] | infinite}
Parameters
days Enter the number of days of the lease. The range is from 0 to 31.
hours Enter the number of hours of the lease. The range is from 0 to 23.
Dynamic Host Configuration Protocol (DHCP) 603