Connectivity Guide

seconds (4 hours). The infinite setting allows addresses that are autocongured using the prex to be
preferred with no time limit.
Defaults All prexes in IPv6 subnets congured on an interface advertise.
Command Mode INTERFACE
Usage Information
• By default, all prexes congured in IPv6 addresses on an interface advertise. To advertise all default
parameters in the subnet prexes on an interface, enter the default keyword.
• If you congure a prex with valid or preferred lifetime values, the ipv6 nd prefix default no
autoconfig
command does not apply the default prex values.
• On-link determination is used to forward IPv6 packets to a destination IPv6 address.
Examples
Enable router advertisements
OS10(conf-if-eth1/1/1)# ipv6 address 2001:0db8:2000::1/64
OS10(conf-if-eth1/1/1)# ipv6 nd send-ra
Change default settings for interface subnet prexes
OS10(conf-if-eth1/1/1)# ipv6 nd prefix default lifetime infinite infinite
Disable advertising an interface subnet prex
OS10(conf-if-eth1/1/1)# ipv6 nd prefix 2001:0db8:2000::/64 no-advertise
Advertise prex for which there is no interface address
OS10(conf-if-eth1/1/1)# ipv6 nd prefix 2001:0db8:3000::/64 no-autoconfig
Supported Releases 10.4.0E(R1) or later
ipv6 nd ra-lifetime
Sets the lifetime of the default router in RA messages.
Syntax
ipv6 nd ra-lifetime seconds
Parameters
• ra-lifetime seconds — Enter a lifetime value in milliseconds, from 0 to 9000 milliseconds.
Defaults Three times the max-ra-interval value
Command Mode INTERFACE
Usage Information The no version of this command restores the default lifetime value. 0 indicates that this router is not used as the
default router.
Example
OS10(config)# interface ethernet 1/2/3
OS10(conf-if-eth1/2/3)# ipv6 nd max-ra-interval 300
Supported Releases 10.4.0E(R1) or later
ipv6 nd reachable-time
Sets the advertised time the router sees a neighbor to be up after it receives a reachability conrmation.
Syntax
ipv6 nd reachable-time milliseconds
Layer 3 523