CLI Reference Guide

Chapter 28 | IP Interface Commands
IPv6 Interface
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Default Setting
30000 milliseconds is used for neighbor discovery operations
0 milliseconds is advertised in router advertisements
Command Mode
Interface Configuration (VLAN)
Command Usage
◆ The time limit configured by this parameter allows the router to detect
unavailable neighbors. During the neighbor discover process, an IPv6 node will
multicast neighbor solicitation messages to search for neighbor nodes. For a
neighbor node to be considered reachable, it must respond to the neighbor
soliciting node with a neighbor advertisement message to become a
confirmed neighbor, after which the reachable timer will be considered in
effect for subsequent unicast IPv6 layer communications.
◆ This time limit is included in all router advertisements sent out through an
interface, ensuring that nodes on the same link use the same time value.
◆ Setting the time limit to 0 means that the configured time is unspecified by this
router.
Example
The following sets the reachable time for a remote node to 1000 milliseconds:
Console(config)#interface vlan 1
Console(config-if)ipv6 nd reachable-time 1000
Console(config-if)#
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)