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24.9 Stateless Autoconfiguration
Stateless Autoconfiguration Section 24: Introducing Basic IPv6 Stateless autoconfiguration uses neighbor discovery mechanisms to find routers and dynamically assign IPv6 addresses. Router advertisements are sent periodically by routers on all their configured interfaces. A router advertisement is sent to the allnodes multicast address. These are examples of information that might be contained in the message: Prefixes that can be used on the link: This information enables stateless autoconfiguration of the hosts. These prefixes must be /64 for stateless autoconfiguration. Lifetime of the prefixes: The default valid lifetime is 30 days, and the default preferred lifetime is 7 days. Flags: Flags indicate the kind of autoconfiguration that the hosts can perform. Default router: The default router advertises existence and lifetime. Other types of information for hosts: This information can include default MTU and hop count. By sending prefixes, router advertisements allow host autoconfiguration. By assigning lifetimes to prefixes, a router advertisement enables administrative renumbering of hosts. Once the lifetime of a deprecated prefix has decreased to zero, a new prefix will be assigned. Router advertisement timing and other parameters can be configured on the routers. Router advertisement packet: ICMP type 134 Source = Router linklocal address Destination = FF02::1 (allnodes multicast address) Data = Options, prefix, lifetime, autoconfiguration flag Router advertisements are sent immediately following a router solicitation. Router solicitations ask routers connected to the local link to send an immediate router advertisement so that the host can receive the autoconfiguration information without waiting for the next scheduled router advertisement. The router solicitation message is defined as follows: The ICMP type is 133. The source address is the unspecified address (or the IP address that is assigned to the sending interface when the IP address is known, which is not usually the case). The destination address is the allrouters multicast address with the linklocal scope. When an answer to a router solicitation is sent, the destination address of the router advertisement is the unicast address of the requester. Router solicitation should be sent only at host boot time and only three times. This practice avoids flooding of router solicitation packets if there is no router on the local network. Router solicitation packet: ICMP type 133 Source = :: (unspecified address) Destination = FF02::2 (allrouters multicast address) The ipv6 address autoconfig command enables stateless autoconfiguration on IPv6 routers on an interfacebyinterface basis. Configuring Stateless Autoconfiguration Command Description Command Description ipv6 address autoconfig [ d e f a u l t ] Configures stateless autoconfiguration on the interface. Configures stateless autoconfiguration on the interface. If the d e f a u l t keyword is added, the router will advertise itself as the default route for the local link. Branch(config-if)#ipv6 address autoconfig [default] Content Unavailable This content is unavailable in this version of the course. Up Next: Routing for IPv6