Chapter 30
| IP Interface Commands
IPv6 Interface
– 931 –
ipv6 nd
reachable-time
This command configures the amount of time that a remote IPv6 node is
considered reachable after some reachability confirmation event has occurred. Use
the no form to restore the default setting.
Syntax
ipv6 nd reachable-time milliseconds
no ipv6 nd reachable-time
milliseconds - The time that a node can be considered reachable after
receiving confirmation of reachability. (Range: 0-3600000)
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 command allows the router to detect
unavailable neighbors.
◆ 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)#pv6 nd reachable-time 1000
Console(config)#
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.
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