BigIron RX Series Configuration Guide 108153-1001986-01Configuring IPv6 neighbor discovery 43Setting flags in IPv6 router advertisement messagesAn IPv6 router advertisement message can include the following flags:• Managed Address Configuration—This flag indicates to hosts on a local link if they should usethe stateful autoconfiguration feature to get IPv6 addresses for their interfaces. If the flag isset, the hosts use stateful autoconfiguration to get addresses as well as non-IPv6-addressinformation. If the flag is not set, the hosts do not use stateful autoconfiguration to getaddresses and if the hosts can get non-IPv6-address information from statefulautoconfiguration is determined by the setting of the Other Stateful Configuration flag.• Other Stateful Configuration—This flag indicates to hosts on a local link if they can get non-IPv6address autoconfiguration information. If the flag is set, the hosts can use statefulautoconfiguration to get non-IPv6-address information.NOTEWhen determining if hosts can use stateful autoconfiguration to get non-IPv6-address information,a set Managed Address Configuration flag overrides an unset Other Stateful Configuration flag. Inthis situation, the hosts can obtain nonaddress information. However, if the Managed AddressConfiguration flag is not set and the Other Stateful Configuration flag is set, then the setting of theOther Stateful Configuration flag is used.By default, the Managed Address Configuration and Other Stateful Configuration flags are not setin router advertisement messages. For example, to set these flags in router advertisementmessages sent from Ethernet interface 3/1, enter the following commands.BigIron RX(config)# interface ethernet 3/1BigIron RX(config-if-e100-3/1)# ipv6 nd managed-config-flagBigIron RX(config-if-e100-3/1)# ipv6 nd other-config-flagSyntax: [no] ipv6 nd managed-config-flagSyntax: [no] ipv6 nd other-config-flagTo remove either flag from router advertisement messages sent on an interface, use the no form ofthe respective command.Enabling and disabling IPv6 router advertisementsIf IPv6 unicast routing is enabled on an Ethernet interface, by default, this interface sends IPv6router advertisement messages. However, by default, non-LAN interface types, for example, tunnelinterfaces, do not send router advertisement messages.To disable the sending of router advertisement messages on an Ethernet interface, entercommands such as the following.BigIron RX(config)# interface ethernet 3/1BigIron RX(config-if-e100-3/1)# ipv6 nd suppress-raTo enable the sending of router advertisement messages on a tunnel interface, enter commandssuch as the following.BigIron RX(config)# interface tunnel 1BigIron RX(config-tnif-1)# no ipv6 nd suppress-raSyntax: [no] ipv6 nd suppress-ra
