ZXR10 5900E Series Configuration Guide (IPv6)
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State auto configuration
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Boot protocol (BOOTstrap Protocol (
)
à
Dynamic Host Configuration Protocol (
)
Both of the two mechanisms allow IP nodes to obtain configuration information from
a special BOOTP server or the DHCP server. These protocols use the state auto
configuration, that is, a server must retain and manage the state information of each
node.
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Stateless auto configuration
Apart from state auto configuration, IPv6 also employs a kind of auto configuration
service named stateless auto configuration. RFC2462 describes the IPv6 stateless
auto configuration.
For the stateless auto configuration, the local link must support multicast. Network
interface must be able to send and receive multicast packets. In the stateless auto
configuration process, the relevant nodes must meet the following requirements.
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A node for auto configuration must determine its own link-local address.
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Authenticate this link-local address to make sure that it is unique in the link.
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The node must determine the information to be configured. Such information can
be the IP address of this node, other configuration information, or both of them.
In case an IP address is needed, the node must determine whether to obtain it
through the stateless auto configuration or through the state auto configuration.
The procedure is as follows:
1.
In the stateless auto configuration process, the host adds its network adapter MAC
address after the 1111111010 prefix of the link-local address to create a link-local
unicast address.
IEEE has modified the network adapter MAC address from 48-bit to 64-bit. If the
network adapter MAC address used by the host is still 48-bit, the IPv6 network
adapter driver will convert the 48-bit MAC address to the 64-bit MAC address in
accordance with an IEEE formula.
2.
The host sends a neighbor discovery request to the address to check whether the
address is unique.
If there is no response to the request, it indicates that the link-local unicast address
configured by the host itself is unique. Otherwise, the host will use an interface
ID randomly created to form a new link-local unicast address.
3.
Taking the address as the source address, the host sends a router solicitation in
the multicast way to all the routers within the local link to request configuration
information. Routers respond to it with a router advertisement containing the
prefix of an aggregable global unicast address and other relevant configuration
information.
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SJ-20150114102049-011|2015-01-15 (R1.0)
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