Connectivity Guide

ip helper-address
Configure the DHCP server address. Forwards UDP broadcasts received on an interface to the DHCP server. You can configure
multiple helper addresses per interface by repeating the same command for each DHCP server address.
Syntax
ip helper-address address [vrf vrf-name]
Parameters
● address — Enter the IPv4 address to forward UDP broadcasts to the DHCP server in A.B.C.D
format.
● vrf vrf-name — (Optional) Enter vrf and then the name of the VRF through which the host
address is reached.
Default Disabled
Command Mode INTERFACE
Usage
Information
The DHCP server is available on L3 interfaces only. The no version of this command returns the value to
the default.The client-facing and server-facing interfaces must be in the same VRF.
Example (IPv4)
OS10(config)# interface eth 1/1/22
OS10(conf-if-eth1/1/22)# ip helper-address 20.1.1.1 vrf blue
Supported
Releases
10.2.0E or later
ipv6 helper-address
Configure the DHCPv6 server address. Forwards UDP broadcasts received from IPv6 clients to the DHCPv6 server. You can
configure multiple helper addresses per interface by repeating the same command for each DHCPv6 server address.
Syntax
ipv6 helper-address ipv6-address [vrf vrf-name]
Parameters
● vrf vrf-name — (Optional) Enter the keyword vrf and then the name of the VRF through which
the host address can be reached.
● ipv6–address — Specify the DHCPv6 server address in the A::B format.
Defaults Disabled
Command Mode INTERFACE
Usage
Information
The no version of this command deletes the IPv6 helper address.
Use this command on the interfaces where the DHCPv6 clients connect to forward the packets from
clients to DHCPv6 server and vice-versa.
Example
OS10(config)# interface ethernet 1/1/22
OS10(conf-if-eth1/1/22)# ipv6 helper-address 2001:db8:0:1:1:1:1:1 vrf
blue
Supported
Releases
10.4.1.0 or later
lease
Configures a lease time for the IP addresses in a pool.
Syntax
lease {infinite | days [hours] [minutes]}
Parameters
● infinite — Enter the keyword to configure a lease which never expires.
● days — Enter the number of lease days (0 to 31).
● hours — Enter the number of lease hours (0 to 23).
● minutes — Enter the number of lease minutes (0 to 59).
Default 24 hours
System management 133