H3C Technologies H3C S5560 Series Switches - Manual (Page 189)

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Configuring IPv6 prefix assignment
Use the following methods to configure IPv6 prefix assignment:
• Configure a static IPv6 prefix binding in an address pool—If you bind a DUID and an IAID to an
IPv6 prefix, the DUID and IAID in a request must match those in the binding before the DHCPv6
server can assign the IPv6 prefix to the DHCPv6 client. If you only bind a DUID to an IPv6 prefix, the
DUID in the request must match the DUID in the binding before the DHCPv6 server can assign the
IPv6 prefix to the DHCPv6 client.
• Apply a prefix pool to an address pool—The DHCPv6 server dynamically assigns an IPv6 prefix
from the prefix pool in the address pool to a DHCPv6 client.
Configuration guidelines
• An IPv6 prefix can be bound to only one DHCPv6 client. You cannot modify bindings that have
been created. To change the binding for a DHCPv6 client, you must delete the existing binding first.
• Only one prefix pool can be applied to an address pool. You cannot modify prefix pools that have
been applied. To change the prefix pool for an address pool, you must remove the prefix pool
application first.
• You can apply a prefix pool that has not been created to an address pool. The setting takes effect
after the prefix pool is created.
Configuration procedure
To configure IPv6 prefix assignment:
Step Command Remarks
1. Enter system view. system-view N/A
2. (Optional.) Specify the
IPv6 prefixes excluded
from dynamic
assignment.
ipv6 dhcp server forbidden-prefix
start-prefix/prefix-len
[ end-prefix/prefix-len ]
By default, no IPv6 prefixes in the
prefix pool are excluded from
dynamic assignment.
If the excluded IPv6 prefix is in a
static binding, the prefix still can
be assigned to the client.
To exclude multiple IPv6 prefix
ranges, repeat this step.
3. Create a prefix pool.
ipv6 dhcp prefix-pool prefix-pool-number
prefix prefix/prefix-len assign-len
assign-len
This step is required for dynamic
prefix assignment.
By default, no prefix pool is
configured.
4. Create a DHCPv6
address pool and enter
its view.
ipv6 dhcp pool pool-name
By default, no DHCPv6 address
pool is configured.
5. Specify an IPv6 subnet
for dynamic assignment.
network prefix/prefix-length
[ preferred-lifetime preferred-lifetime
valid-lifetime valid-lifetime ] By default, no IPv6 subnet is
specified for dynamic
assignment.