Brocade Communications Systems 6650 manual Setting IPv6 router advertisement parameters

5 IPv6 neighbor discovery configuration

NOTE

Duplicate Address Detection (DAD) is not currently supported with IPv6 tunnels. Make sure tunnel endpoints do not have duplicate IP addresses.

You can configure the following neighbor solicitation message parameters that affect duplicate address detection while it verifies that a tentative unicast IPv6 address is unique:

•The number of consecutive neighbor solicitation messages that duplicate address detection sends on an interface. By default, duplicate address detection sends three neighbor solicitation messages without any follow-up messages.

•The interval in seconds at which duplicate address detection sends a neighbor solicitation message on an interface. By default, duplicate address detection sends a neighbor solicitation message every 1000 milliseconds.

For example, to change the number of neighbor solicitation messages sent on Ethernet interface 1/2/1 to two and the interval between the transmission of the two messages to 9 seconds, enter the following commands.

Brocade(config)#interface ethernet 1/1/1

Brocade(config-if-e10000-1/1/1)#ipv6 nd dad attempt 2

Brocade(config-if-e10000-1/1/1)#ipv6 nd ns-interval 9000

Syntax: [no] ipv6 nd dad attempt <number>

Syntax: [no] ipv6 nd ns-interval <number>

For the number of neighbor solicitation messages, specify a number from 0 – 255. The default is

3.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 and the value for the retrans timer in router advertisements, specify a number from 0 – 4294967295 milliseconds. The default value for the interval between neighbor solicitation messages is 1000 milliseconds. The default value for the retrans timer is 0. Brocade does not recommend very short intervals in normal IPv6 operation. When a non-default value is configured, the configured time is both advertised and used by the router itself. To restore the default interval, use the no form of this command.

Setting IPv6 router advertisement parameters

You can adjust the following parameters for router advertisement messages:

•The interval (in seconds) at which an interface sends router advertisement messages. By default, an interface sends a router advertisement message every 200 seconds.

•The "router lifetime" value, which is included in router advertisements sent from a particular interface. The value (in seconds) indicates if the router is advertised as a default router on this interface. If you set the value of this parameter to 0, the router is not advertised as a default router on an interface. If you set this parameter to a value that is not 0, the router is advertised as a default router on this interface. By default, the router lifetime value included in router advertisement messages sent from an interface is 1800 seconds.

•The hop limit to be advertised in the router advertisement.

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