ipv6 nd reachable-time (BNG)
To configure the amount of time that a remote IPv6 node is considered reachable after some reachability
confirmation event has occurred, use the ipv6 nd reachable-time command in an appropriate configuration
mode. To restore the default time, use the no form of this command.
ipv6 nd reachable-time milliseconds
no ipv6 nd reachable-time
Syntax Description
The amount of time (in milliseconds) that a remote IPv6 node is considered
reachable. The range is from 0 to 3600000.
milliseconds
Command Default
0 milliseconds (unspecified) is advertised in router advertisements and 30000 (30 seconds) is used for the
neighbor discovery activity of the router itself.
Command Modes
Interface configuration (not applicable for BNG)
Dynamic template configuration (for BNG)
Command History
ModificationRelease
This command was introduced.Release 3.7.2
This command was supported in the dynamic template configuration
mode for BNG.
Release 4.3.0
Usage Guidelines
The configured time enables the router to detect unavailable neighbors. Shorter configured times enable the
router to detect unavailable neighbors more quickly; however, shorter times consume more IPv6 network
bandwidth and processing resources in all IPv6 network devices. Very short configured times are not
recommended in normal IPv6 operation.
The configured time is included in all router advertisements sent out of an interface so that nodes on the same
link use the same time value. A value of 0 indicates that the configured time is unspecified by this router.
For BNG, ensure you run this command in the dynamic template configuration mode. To enter the dynamic
template configuration mode, run dynamic-template command in the Global Configuration mode.
Task ID
OperationsTask ID
read, writeipv6
read, writenetwork
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Command Reference,
Release 5.2.x
372
Neighbor Discovery Commands
ipv6 nd reachable-time (BNG)
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