Chapter 26
| DHCP Commands
DHCP Relay
– 739 –
DHCP for IPv6
ipv6 dhcp relay
destination
This command specifies a DHCPv6 server or the VLAN to which client requests are
forwarded, and also enables DHCPv6 relay service on this interface. Use the no
form to disable this service.
Syntax
ipv6 dhcp relay destination {ipv6-address | multicast {all | vlan vlan-id}}
no ipv6 dhcp relay destination [ipv6-address | multicast {all |
vlan vlan-id}]
ipv6-address - IPv6 address of a DHCPv6 server or another relay server.
(Range: 1-3 addresses)
multicast - Uses the all DHCPv6 server multicast address.
all - Specifies all local VLAN interfaces.
vlan-id - VLAN ID (Range: 1-4094)
Default Setting
None
Command Mode
Privileged Exec
Command Usage
â—† You must specify the IPv6 address for at least one DHCPv6 server or another
relay agent, or the VLAN to which to multicast a relay message. Otherwise, the
switch’s DHCPv6 relay agent will not forward client requests. This command
enables DHCPv6 relay service for the VLAN from which the command is
entered.
â—† Up to five destination addresses may be defined using consecutive commands.
â—† This command is used to configure DHCPv6 relay functions for host devices
attached to the switch. If DHCPv6 relay service is enabled (by entering this
command), and this switch sees a DHCPv6 request broadcast, it inserts its own
IPv6 address into the request so the DHCPv6 server will know the subnet where
the client is located. Then, the switch forwards the packet to the DHCPv6 server
on another network. When the server receives the DHCPv6 request, it allocates
a free IPv6 address for the DHCPv6 client from its defined scope for the DHCPv6
client’s subnet, and sends a DHCPv6 response back to the DHCPv6 relay agent
(i.e., this switch). This switch then broadcasts the DHCPv6 response received
from the server to the client.
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