BigIron RX Series Configuration Guide 107953-1001986-01Configuring IPv6 neighbor discovery 43You can configure the following neighbor solicitation message parameters that affect duplicateaddress detection while it verifies that a tentative unicast IPv6 address is unique:• The number of consecutive neighbor solicitation messages that duplicate address detectionsends on an interface. By default, duplicate address detection sends three neighborsolicitation messages without any follow-up messages.• The interval in seconds at which duplicate address detection sends a neighbor solicitationmessage on an interface. By default, duplicate address detection sends a neighbor solicitationmessage every 1 second.NOTEFor the interval at which duplicate address detection sends a neighbor solicitation message on aninterface, the Brocade device uses seconds as the unit of measure instead of milliseconds.For example, to change the number of neighbor solicitation messages sent on Ethernet interface3/1 to two and the interval between the transmission of the two messages to 9 seconds, enter thefollowing commands.BigIron RX(config)# interface ethernet 3/1BigIron RX(config-if-e100-3/1)# ipv6 nd dad attempt 2BigIron RX(config-if-e100-3/1)# ipv6 nd ns-interval 9Syntax: [no] ipv6 nd dad attempt <number>Syntax: [no] ipv6 nd ns-interval <number>For the number of neighbor solicitation messages, you can specify any number of attempts.Configuring a value of 0 disables duplicate address detection processing on the specified interface.To restore the number of messages to the default value, use the no form of this command.For the interval between neighbor solicitation messages, you can specify any number of seconds.Brocade does not recommend very short intervals in normal IPv6 operation. When a non-defaultvalue is configured, the configured time is both advertised and used by the router itself. To restorethe default interval, use the no form of this command.Setting IPv6 router advertisement parametersYou can adjust the following parameters for router advertisement messages:• The interval (in seconds) at which an interface sends router advertisement messages. Bydefault, an interface sends a router advertisement message every 200 seconds.• The "router lifetime" value, which is included in router advertisements sent from a particularinterface. The value (in seconds) indicates if the router is advertised as a default router on thisinterface. If you set the value of this parameter to 0, the router is not advertised as a defaultrouter on an interface. If you set this parameter to a value that is not 0, the router is advertisedas a default router on this interface. By default, the router lifetime value included in routeradvertisement messages sent from an interface is 1800 seconds.When adjusting these parameter settings, Brocade recommends that the interval between routeradvertisement transmission be less than or equal to the router lifetime value if the router isadvertised as a default router. For example, to adjust the interval of router advertisements to 300seconds and the router lifetime value to 1900 seconds on Ethernet interface 3/1, enter thefollowing commands.BigIron RX(config)# interface ethernet 3/1BigIron RX(config-if-e100-3/1)# ipv6 nd ra-interval 300BigIron RX(config-if-e100-3/1)# ipv6 nd ra-lifetime 1900
