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Usage guidelines
You can exclude multiple IP address ranges from dynamic allocation.
The IPv6 addresses of some devices such as the gateway and FTP server cannot be assigned to
clients. Use this command to exclude such addresses from dynamic allocation.
If the excluded IPv6 address is in a static binding, the address can still be assigned to the client.
The address or address range specified in the undo form of the command must be the same as the
address or address range specified in the command. To remove an IP address that has been
specified as part of an address range, you must remove the entire address range.
Examples
# Exclude IPv6 addresses of 2001:10:110::1 through 2001:10:110::20 from dynamic assignment.
<Sysname> system-view
[Sysname] ipv6 dhcp server forbidden-address 2001:10:110::1 2001:10:110::20
Related commands
ipv6 dhcp server forbidden-prefix
static-bind
ipv6 dhcp server forbidden-prefix
Use ipv6 dhcp server forbidden-prefix to exclude specific IPv6 prefixes from dynamic allocation.
Use undo ipv6 dhcp server forbidden-prefix to remove the configuration.
Syntax
ipv6 dhcp server forbidden-prefix start-prefix/prefix-len [ end-prefix/prefix-len ]
undo ipv6 dhcp server forbidden-prefix start-prefix/prefix-len [ end-prefix/prefix-len ]
Default
No IPv6 prefixes in the DHCPv6 prefix pool are excluded from dynamic allocation.
Views
System view
Predefined user roles
network-admin
Parameters
start-prefix/prefix-len: Specifies the start IPv6 prefix. The prefix-len argument specifies the prefix
length in the range of 1 to 128.
end-prefix/prefix-len: Specifies the end IPv6 prefix. The prefix-len argument specifies the prefix
length, ranging from 1 to 128. The value for end-prefix cannot be lower than that for start-prefix. If
you do not specify this argument, only the start-prefix/prefix-len is excluded from dynamic allocation.
If you specify this argument, the prefixes from start-prefix/prefix-len to end-prefix/prefix-len are all
excluded.
Usage guidelines
You can exclude multiple IPv6 prefix ranges from dynamic allocation.
If the excluded IPv6 prefix is in a static binding, the prefix can still be assigned to the client.
The prefix or prefix range specified in the undo form of the command must be the same as the prefix
or prefix range specified in the command. To remove a prefix that has been specified as part of a
prefix range, you must remove the entire prefix range.
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