`ipv6 helper-address`

Syntax

ipv6 helper-address unicast <UNICAST-IPV6-ADDR> 

no ipv6 helper-address unicast <UNICAST-IPV6-ADDR> 

ipv6 helper-address multicast {all-dhcp-servers | <MULTICAST-IPV6-ADDR>} egress <PORT-NUM>

no ipv6 helper-address multicast {all-dhcp-servers | <MULTICAST-IPV6-ADDR>} egress <PORT-NUM>

Description

Defines the address of a remote DHCPv6 server or DHCPv6 relay agent. Up to eight addresses can be defined. The DHCPv6 agent forwards DHCPv6 client requests to all defined servers.

Not supported on the OOBM interface.

The no form of this command removes an IP helper address.

Command context

config-if

Parameters

<UNICAST-IPV6-ADDR>: Specifies the unicast helper IP address in IPv6 format (xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx), where x is a hexadecimal number from 0 to F.
<MULTICAST-IPV6-ADDR>: Specifies the multicast helper IP address in IPv6 format (xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx), where x is a hexadecimal number from 0 to F.
all-dhcp-servers: Specifies all the DHCP server IPv6 addresses for the interface.
egress <PORT-NUM>: Specifies the port number on which DHCPv6 service requests are relayed to a multicast destination. The egress port must be different than the one on which the multicast helper address is configured. Format: member/slot/port.
vrf <VRF-NAME>: Specifies the name of the VRF from which the specified protocol sets its source IP address.

Authority

Administrators or local user group members with execution rights for this command.

Examples

On the 6400 Switch Series, interface identification differs.

Defining a multicast IPv6 helper address of 2001:DB8::1 on port 1/1/2:

switch(config-if)# ipv6 helper-address multicast 2001:DB8:0:0:0:0:0:1 egress 1/1/2

Removing the IP helper address of 2001:DB8::1 on port 1/1/2:

switch(config-if)# no ipv6 helper-address multicast 2001:DB8:0:0:0:0:0:1 egress 1/1/2