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Restrictions and guidelines
When you configure IPv6 prefix assignment, follow these restrictions and 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.
Procedure
To configure IPv6 prefix assignment:
Step
1.
Enter system view.
2.
(Optional.) Specify the
IPv6 prefixes excluded
from dynamic
assignment.
3.
Create a prefix pool.
4.
Create a DHCPv6
address pool and enter
its view.
5.
Specify an IPv6 subnet
for dynamic
assignment.
Command
system-view
ipv6 dhcp server forbidden-prefix
start-prefix/prefix-len
[ end-prefix/prefix-len ] [ vpn-instance
vpn-instance-name ]
ipv6 dhcp prefix-pool
prefix-pool-number prefix
{ prefix-number | prefix/prefix-len }
assign-len assign-len [ vpn-instance
vpn-instance-name ]
ipv6 dhcp pool pool-name
network { prefix/prefix-length | prefix
prefix-number
[ sub-prefix/sub-prefix-length ] }
[ preferred-lifetime preferred-lifetime
valid-lifetime valid-lifetime ]
179
Remarks
N/A
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.
This step is required for dynamic
prefix assignment.
By default, no prefix pools exist.
If you specify an IPv6 prefix by
its ID, make sure the IPv6 prefix
is in effect. Otherwise, the
configuration does not take
effect.
By default, no DHCPv6 address
pools exist.
By default, no IPv6 subnet is
specified for dynamic
assignment.
The IPv6 subnets cannot be the
same in different address pools.
If you specify an IPv6 prefix by
its ID, make sure the IPv6 prefix
is in effect. Otherwise, the
configuration does not take
effect.
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Troubleshooting
