The Router Advertisement (RA) is also used to respond to the Router Solicitation (RS)
message sent by the host, and the Router Solicitation (RS) message allows the host to
obtain the auto-configuration information immediately, but need not to wait the router to send
the Router Advertisement (RA) once the host is activated. If there is no unicast address
when the host is activated at just, the Router Solicitation (RS) message sent by the host will
use the unassigned address (0:0:0:0:0:0:0:0) as the source address of the solicitation
message. Otherwise, the existing unicast address is taken as the source address, while the
Router Solicitation (RS) message uses the multicast address (FF02::2) of all routers for the
local link as the destination address. As the response router solicitation (RS) message, the
Router Advertisement (RA) message will use the source address of the solicitation message
as the destination address (if the source address is the unassigned address, it will use the
multicast address FF02::1) of all nodes for the local link.
The following parameters can be configured in the Router Advertisement (RA) message:
ra-interval, it is the sending interval of the Router Advertisement (RA).
ra-lifetime, it is the router lifetime, namely whether the router is acted as the default router of
the local link and the time as this role.
prefix, it is the IPv6 address prefix of the local link, which can be used to carry out the
auto-configuration by the host, including the configuration of other parameters for the prefix.
rs-initerval, it is the retransmitted time interval of the neighbor solicitation message.
reachabletime, it is the time maintained after the neighbor reachable time and the neighbor
is considered to be reachable.
We configure the above parameters in the IPv6 interface property.
1. By default, no Router Advertisement (RA) message is positively sent
on the interface. If you want to allow a Router Advertisement (RA)
message to be sent, you can use the command no ipv6 nd
suppress-ra in the interface configuration mode.
2. In order to make the stateless address auto-configuration of the node
work normally, the length of the prefix for the router advertisement
(RA) message should be 64 bits.
32.2 IPv6 Configuration
The following will introduce the configuration of various function modules of the IPv6
respectively:
32.2.1 Configuring IPv6 Address
The task of this section describes how to configure an IPv6 address on an interface. By
default, no IPv6 address is configured.
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