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The above four steps finish a Dynamic host configuration assignment process. However, if the DHCP v6
server and the DHCP v6 client are not in the same network, the server will not rec eive the DHCP v6 broadcast
packets sent by the client, therefore no DHCP v6 packets will be sent to the client by the server. In this case, a
DHCP v6 relay is required to forward such DHCP v6 packets so that the DHCP v6 packets exchange can be
completed between the DHCP v6 client and server.
At the time this manual is written, DHCP v6 server, relay and prefix delegation client have been implemented
on the switch. When the DHCP v6 relay rec eives any messages from the DHCP v6 client, it will encapsulate
the request in a Relay -forward packet and deliver it to the next DHCP v6 relay or the DHCP v6 server. The
DHCP v6 messages coming from the server will be encapsulated as relay reply packets to the DHCP v6 relay.
The relay then removes the encapsulation and delivers it the DHCP v6 client or the next DHCP v6 relay in the
network.
For DHCP v6 prefix delegation where DHCP v6 server is configured on the PE router and DHCP v6 client it
configured on the CPE router, the CPE router is able to send address prefix allocation request to the PE
router and get a pre-configured address prefix, but not set the address prefix manually. The protocol
negotiation bet ween the client and the prefix delegation client is quite similar to that when getting a DHCP v6
address. Then the CPE router divides the allocated prefix – whose length should be less than 64 characters,
into 64 subnets. The divided address prefix will be advertised through routing advertisement messages (RA)
to the host directly connected to the client.
29.2 DHCPv6 Server Configuration
DHCP v6 server configuration task list as below:
1.
To enable/disable DHCP v6 service
2.
To configure DHCP v6 address pool
（1） To achieve/ delet e DHCP v6 address pool
（2） To configure parameter of DHCP v6 address pool
3.
To enable DHCP v6 server function on port
1. To enable/disable DHCP v6 service
Global Mode
servi ce dhcpv6
no servi ce dhcpv6
2. To configure DHCP v6 address pool
（1）To achieve/delete DHCP v6 address pool
Global Mode
ipv6 dhcp pool <poolnam e>
no ipv6 dhcp pool <poolnam e>
Command
Command
Explanation
To enable DHCP v6 service.
Explanation
To configure DHCP v6 address pool.
29-2
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Troubleshooting
