16.1 Router Advertisement

Interface Command: no ipv6 nd suppress-ra

Send router advertisment messages.

Interface Command: ipv6 nd suppress-ra

Don’t send router advertisment messages.

Interface Command: ipv6 nd prefix ipv6prefix [valid-lifetime] [preferred-lifetime] [off-link] [no-autoconfig] [router-address]

Configuring the IPv6 prefix to include in router advertisements. Several prefix specific optional parameters and flags may follow:

• valid-lifetime - the length of time in seconds during what the prefix is valid for the purpose of on-link determination. Value infinite represents infinity (i.e. a value of all one bits (0xffffffff)).

  Range: <0-4294967295> Default: 2592000

• preferred-lifetime - the length of time in seconds during what addresses generated from the prefix remain preferred. Value infinite represents infinity.

  Range: <0-4294967295> Default: 604800

• off-link - indicates that advertisement makes no statement about on-link or off-link properties of the prefix.

  Default: not set, i.e. this prefix can be used for on-link determination.

• no-autoconfig - indicates to hosts on the local link that the specified prefix cannot be used for IPv6 autoconfiguration.

  Default: not set, i.e. prefix can be used for autoconfiguration.

• router-address - indicates to hosts on the local link that the specified prefix contains a complete IP address by setting R flag.

  Default: not set, i.e. hosts do not assume a complete IP address is placed.

Interface Command: ipv6 nd ra-interval <1-1800>

Interface Command: no ipv6 nd ra-interval [<1-1800>]

The maximum time allowed between sending unsolicited multicast router advertisements from the interface, in seconds.

Default: 600

Interface Command: ipv6 nd ra-interval msec <70-1800000>

Interface Command: no ipv6 nd ra-interval [msec <70-1800000>]

The maximum time allowed between sending unsolicited multicast router advertisements from the interface, in milliseconds.

Default: 600000

Interface Command: ipv6 nd ra-lifetime <0-9000>

Interface Command: no ipv6 nd ra-lifetime [<0-9000>]

The value to be placed in the Router Lifetime field of router advertisements sent from the interface, in seconds. Indicates the usefulness of the router as a default router on this interface. Setting the value to zero indicates that the router should not be considered a default router on this interface. Must be either zero or between value specified with ipv6 nd ra-interval (or default) and 9000 seconds.

Default: 1800

Interface Command: ipv6 nd reachable-time <1-3600000>

Interface Command: no ipv6 nd reachable-time [<1-3600000>]

The value to be placed in the Reachable Time field in the Router Advertisement messages sent by the router, in milliseconds. The configured time enables the router to detect unavailable neighbors. The value zero means unspecified (by this router).

Default: 0

Interface Command: ipv6 nd managed-config-flag

Interface Command: no ipv6 nd managed-config-flag

Set/unset flag in IPv6 router advertisements which indicates to hosts that they should use managed (stateful) protocol for addresses autoconfiguration in addition to any addresses autoconfigured using stateless address autoconfiguration.

Default: not set

Interface Command: ipv6 nd other-config-flag

Interface Command: no ipv6 nd other-config-flag

Set/unset flag in IPv6 router advertisements which indicates to hosts that they should use administered (stateful) protocol to obtain autoconfiguration information other than addresses.

Default: not set

Interface Command: ipv6 nd home-agent-config-flag

Interface Command: no ipv6 nd home-agent-config-flag

Set/unset flag in IPv6 router advertisements which indicates to hosts that the router acts as a Home Agent and includes a Home Agent Option.

Default: not set

Interface Command: ipv6 nd home-agent-preference <0-65535>

Interface Command: no ipv6 nd home-agent-preference [<0-65535>]

The value to be placed in Home Agent Option, when Home Agent config flag is set, which indicates to hosts Home Agent preference. The default value of 0 stands for the lowest preference possible.

Default: 0

Interface Command: ipv6 nd home-agent-lifetime <0-65520>

Interface Command: no ipv6 nd home-agent-lifetime [<0-65520>]

The value to be placed in Home Agent Option, when Home Agent config flag is set, which indicates to hosts Home Agent Lifetime. The default value of 0 means to place the current Router Lifetime value.

Default: 0

Interface Command: ipv6 nd adv-interval-option

Interface Command: no ipv6 nd adv-interval-option

Include an Advertisement Interval option which indicates to hosts the maximum time, in milliseconds, between successive unsolicited Router Advertisements.

Default: not set

Interface Command: ipv6 nd router-preference (high|medium|low)

Interface Command: no ipv6 nd router-preference [(high|medium|low)]

Set default router preference in IPv6 router advertisements per RFC4191.

Default: medium

Interface Command: ipv6 nd mtu <1-65535>

Interface Command: no ipv6 nd mtu [<1-65535>]

Include an MTU (type 5) option in each RA packet to assist the attached hosts in proper interface configuration. The announced value is not verified to be consistent with router interface MTU.

Default: don’t advertise any MTU option

interface eth0
 no ipv6 nd suppress-ra
 ipv6 nd prefix 2001:0DB8:5009::/64

For more information see RFC2462 (IPv6 Stateless Address Autoconfiguration) , RFC4861 (Neighbor Discovery for IP Version 6 (IPv6)) , RFC6275 (Mobility Support in IPv6) and RFC4191 (Default Router Preferences and More-Specific Routes).