ipv6 dhcp server forbidden-address

Use ipv6 dhcp server forbidden-address to exclude IPv6 addresses in the DHCPv6 address pool from dynamic allocation.

Use undo ipv6 dhcp server forbidden-address to remove the configuration.

Syntax

ipv6 dhcp server forbidden-address start-ipv6-address [ end-ipv6-address ] [ vpn-instance vpn-instance-name ]

undo ipv6 dhcp server forbidden-address start-ipv6-address [ end-ipv6-address ] [ vpn-instance vpn-instance-name ]

Default

Except for the DHCPv6 server address, all IPv6 addresses in a DHCPv6 address pool are assignable.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

start-ipv6-address: Specifies the start IPv6 address.

end-ipv6-address: Specifies the end IPv6 address, which cannot be lower than start-ipv6-address. If you do not specify an end IPv6 address, only the start IPv6 address is excluded from dynamic allocation. If you specify an end IPv6 address, the IP addresses from start-ipv6-address through end-ipv6-address are all excluded from dynamic allocation.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If the excluded IPv6 addresses belong to the public network, do not specify this option.

Usage guidelines

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 DHCPv6 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.

You can execute this command multiple times to exclude multiple IPv6 address ranges from dynamic allocation.

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