Eui-64 address-based interface identifiers, Ipv6 neighbor discovery protocol – H3C Technologies H3C SecPath F1000-E User Manual
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Multicast addresses also include solicited-node addresses. A node uses a solicited-node multicast
address to acquire the link-layer address of a neighboring node on the same link and to detect duplicate
addresses. Each IPv6 unicast or anycast address has a corresponding solicited-node address. The format
of a solicited-node multicast address is:
FF02:0:0:0:0:1:FFXX:XXXX
Where FF02:0:0:0:0:1:FF is fixed and consists of 104 bits, and XX:XXXX is the last 24 bits of an IPv6
unicast address or anycast address.
EUI-64 address-based interface identifiers
An interface identifier is 64 bits and uniquely identifies an interface on a link.
Various types of interfaces generate EUI-64 address-based interface identifiers in different ways.
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On an IEEE 802 interfaces (such as an Ethernet interface and a VLAN interface)
The interface identifier is derived from the link-layer address (typically a MAC address) of the interface.
To expand the 48-bit MAC address to a 64-bit interface identifier, the hexadecimal number FFFE (that is,
16 bits of 1111111111111110) is inserted into the MAC address (behind the 24th high-order bit). To ensure
that the obtained interface identifier is unique, the universal/local (U/L) bit (which is the seventh
high-order bit) is set to 1. Thus, an EUI-64 address-based interface identifier is obtained.
shows the process of how an EUI-64 address-based interface identifier is generated from a MAC
address.
Figure 2 Convert a MAC address into an EUI-64 address-based interface identifier
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On a tunnel interface
The lower 32 bits of the EUI-64 address-based interface identifier are the source IPv4 address of the
tunnel interface. The higher 32 bits of the EUI-64 address-based interface identifier of an ISATAP tunnel
interface are 0000:5EFE, whereas those of other tunnel interfaces are all zeros. For more information
about tunnels, refer to Tunneling Configuration in the IP Services Volume.
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On an interface of another type (such as a serial interface)
The EUI-64 address-based interface identifier is generated randomly by the device.
IPv6 Neighbor Discovery Protocol
The IPv6 Neighbor Discovery (ND) protocol uses five types of ICMPv6 messages to implement the
following functions:
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