ECS4660-28F_Management Guide-R03

C HAPTER 49 | IP Interface Commands
IPv6 Interface
– 1690 –
ipv6 nd prefix This command configures the IPv6 prefixes to include in router
advertisements. Use the no form to remove a prefix.
SYNTAX
ipv6 nd prefix ipv6-address/prefix-length {default |
[valid-lifetime preferred-lifetime [no-autoconfig | off-link]]}
no ipv6 nd prefix ipv6-address/prefix-length
ipv6-address - An IPv6 address including the network prefix and
host address bits.
prefix-length - A decimal value indicating how many contiguous bits
(from the left) of the address comprise the prefix (i.e., the network
portion of the address).
default - Uses default values for remaining parameters.
valid-lifetime - The amount of time that the specified IPv6 prefix is
advertised as being valid. (Range: 0-4294967295 seconds)
preferred-lifetime - The amount of time that the specified IPv6
prefix is advertised as being preferred. The preferred lifetime is
counted down in real time. (Range: 0-4294967295 seconds)
no-autoconfig - Indicates to hosts on the local link that the
specified prefix cannot be used for IPv6 autoconfiguration.
off-link - Indicates that the specified prefix is assigned to the link.
Nodes sending traffic to addresses that contain the prefix consider
the destination to be locally reachable on the link.
DEFAULT SETTING
valid-lifetime 2592000 seconds
preferred-lifetime 2592000 seconds
no-autoconfig Disabled
off-link Disabled
COMMAND MODE
Interface Configuration (VLAN)
COMMAND USAGE
◆ Prefixes configured as addresses on an interface using the ipv6 address
command are advertised in router advertisements. If prefixes are
configured for advertisement using the ipv6 nd prefix command, then
only these prefixes are advertised.
◆ The preferred lifetime and valid lifetime are counted down in real time.
After the preferred lifetime expires, no new connections are made using
this prefix. When the valid lifetime expires, this prefix will no longer be
advertised.
◆ All prefixes are inserted in the routing table as Connected (i.e., on-
line), unless specified with the off-link option. If the off-link option is
specified, and the prefix is already present in the routing table as a
Connected prefix, it will be removed.