Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 336

• ipv6 nd ra-lifetime seconds - (Optional) Sets the lifetime of a default router in RA messages (0 to 9000 milliseconds; default 3 times the max-ra-interval setting). 0 indicates that this router is not used as a default router. • ipv6 nd reachable-time milliseconds - (Optional) Sets the advertised time for which the router sees that a neighbor is up after it receives neighbor reachability confirmation (0 to 3600000 milliseconds; default 0). 0 indicates that no reachable time is sent in RA messages. • ipv6 nd retrans-timer seconds - (Optional) Sets the time between retransmitting neighbor solicitation messages (100 to 4292967295 milliseconds). By default, no retransmit timer is configured. 3 Configure the IPv6 prefixes that are advertised by IPv6 neighbor discovery in Interface mode. ipv6 nd prefix {ipv6-prefix | default} [no-advertise] [no-autoconfig] [no-rtr-address] [off-link] [lifetime {valid-lifetime seconds | infinite} {preferred-lifetime seconds | infinite}] • ipv6-prefix - Enter an IPv6 prefix in x:x::y/mask format to include the prefix in RA mesages. Include prefixes that are not already in the subnets configured on the interface. • default - Configure the prefix parameters advertised in all subnets configured on the interface. • no-advertise - (Optional) Do not advertise the specified prefix. By default, all prefixes in configured subnets are advertised. • no-autoconfig - (Optional) Sets AdvAutonomous to Off for the specified prefix in the radvd.conf file. This setting tells hosts to not use this prefix for address autoconfiguration. By default, AdvAutonomous is On. • no-rtr-address - (Optional) Sets AdvRouterAddr to Off for the prefix in the radvd.conf file. The Off setting tells hosts to not use the advertising router address for on-link determination. By default, AdvRouterAddr is On. • off-link - (Optional) Sets AdvOnLink to Off for the prefix in the radvd.conf file. The Off setting tells hosts to not use this prefix for on-link determination. By default, AdvOnLink is On. • lifetime {valid-lifetime seconds | infinite} - (Optional) Sets AdvValidLifetime (in seconds) for the prefix in the radvd.conf file. The prefix is valid for on-link determination only for the specified lifetime. The default is 86400 seconds (1 day). The infinite setting allows the prefix to be valid for on-link determination with no time limit. • 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 is not configured 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. 336 Layer 3