Ruijie RG-S2900G-E Series, Руководство по настройке

Страница: 341 / 943

Configuration Guide IPv6 Configuration
address of the solicited node for each configured unicast address and anycast
address. The prefix of the multicast address for the solicited node is
FF02:0:0:0:0:1:FF00:0000/104, another 24 bits are comprised of the unicast address
or the lower 24 bits of the anycast address, for instance, the multicast address of the
solicited node corresponding to the FE80::2AA:FF:FE21:1234 is FF02::1:FF21:1234,
The multicast address of solicited node is usually used to the neighbor solicitation (NS)
message. The format of the solicited node is shown as follows:
Anycast Addresses
The anycast address is similar with the multicast address as more than one node
shares an anycast address. The difference is that only one node expects to receive
the data packet of the anycast address, while all nodes of the multicast address
members expect to receive all packets sending to this address. The anycast address
is assigned to normal IPv6 unicast address space, so the anycast address cannot be
differentiated from the unicast address from the style. For this reason, each member of
all anycast addresses has to be configured explicitly to identify the anycast address.
Caution
The anycast address can only be assigned to the router, but cannot be
assigned to the host. Furthermore, the anycast address cannot be
taken as the source address of the message.
The RFC2373 predefines an anycast address, referred to as the anycast address of
the subnet router. The following diagram shows the anycast address format of the
subnet router, which consists of the subnet prefix followed by a series of 0s (as the
interface identifier).
Where, the subnet prefix identifies a specified link (subnet) and the packet to be sent
to the anycast address of the subnet router will be distributed to a router of this subnet.
The anycast address of the subnet router is usually used for some node which needs
to communicate with one router of the remote subnet.