Connectivity Guide

● lifetime {preferred-lifetime seconds | infinite} — (Optional) Sets AdvPreferredLifetime in
seconds for the prefix in the radvd.conf file. IPv6 addresses generated from the prefix using stateless autoconfiguration
remain preferred for the configured lifetime. The default is 14400 seconds (4 hours). The infinite setting allows
addresses that are autoconfigured using the prefix to be preferred with no time limit.
By default, all prefixes configured in IPv6 addresses on an interface are advertised. To modify the default values advertised
for interface subnet prefixes, use the ipv6 nd prefix default command and specify new default settings.
On-link determination is the process used to forward IPv6 packets to a destination IPv6 address.
Configure neighbor discovery
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd mtu 1500
OS10(conf-if-eth1/1/1)# ipv6 nd send-ra
Configure advertised IPv6 prefixes
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd prefix default lifetime infinite infinite
OS10(conf-if-eth1/1/1)# ipv6 nd prefix 2002::/64
Duplicate address discovery
To determine if an IPv6 unicast address is unique before assigning it to an interface, an OS10 switch sends a neighbor
solicitation message. If the process of duplicate address discovery (DAD) detects a duplicate address in the network, the
address does not configure on the interface. DAD is enabled by default.
By default, IPv6 is not disabled when a duplicate address is detected. Only the duplicate address is not applied. Other IPv6
addresses are still active on the interface.
To disable IPv6 on an interface when a duplicate link-local address is detected, use the ipv6 nd dad disable-ipv6-on-
failure command. To re-enable IPv6 after you resolve a duplicate link-local address, enter no ipv6 enable, then the
ipv6 enable command.
● Disable or re-enable IPv6 duplicate address discovery in Interface mode.
ipv6 nd dad {disable | enable}
● Disable IPv6 on an interface if a duplicate link-local address is discovered in Interface mode.
ipv6 nd dad disable-ipv6-on-dad-failure
Disable duplicate address discovery
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd dad disable
Disable IPv6 for duplicate link-local address
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd dad disable-ipv6-on-dad-failure
Static IPv6 routing
To define an explicit route between two IPv6 networking devices, configure a static route on an interface. Static routing is
useful for smaller networks with only one path to an outside network, or to provide security for certain traffic types in a larger
network.
● Enter the static routing information including the IPv6 address and mask in x:x:x:x::x format in CONFIGURATION mode. The
length is from 0 to 64.
ipv6 route ipv6–prefix/mask {next-hop | interface interface [route-preference]}
Layer 3
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