HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 90

Multicast addresses, EUI-64 address-based interface identifiers, Table 6,

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• A loopback address is 0:0:0:0:0:0:0:1 (or ::1). It cannot be assigned to any physical interface and can be used by a node to send an IPv6 packet to itself in the same way as the loopback address in IPv4. • An unspecified address is 0:0:0:0:0:0:0:0 (or ::). It cannot be assigned to any node. Before acquiring a valid IPv6 address, a node fills this address in the source address field of IPv6 packets. The unspecified address cannot be used as a destination IPv6 address. Multicast addresses IPv6 multicast addresses listed in Table 6 are reserved for special purposes. Table 6 Reserved IPv6 multicast addresses Address FF01::1 FF02::1 FF01::2 FF02::2 Application Node-local scope all-nodes multicast address Link-local scope all-nodes multicast address Node-local scope all-routers multicast address Link-local scope all-routers multicast address 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. Interfaces generate EUI-64 address-based interface identifiers differently. • On an IEEE 802 interface (such as a VLAN interface) The interface identifier is derived from the link-layer address (typically a MAC address) of the interface. The MAC address is 48 bits long. To obtain an EUI-64 address-based interface identifier, you must insert the hexadecimal number FFFE (16 bits of 1111111111111110) into the MAC address (behind the 24th high-order bit), and set the universal/local (U/L) bit (which is the seventh high-order bit) to 1, to make sure that the obtained EUI-64 address-based interface identifier is globally unique. Figure 44 shows how an EUI-64 address-based interface identifier is generated from a MAC address. Figure 44 Converting a MAC address into an EUI-64 address-based interface identifier 82

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82
•
A loopback address is 0:0:0:0:0:0:0:1 (or ::1). It cannot be assigned to any physical interface and
can be used by a node to send an IPv6 packet to itself in the same way as the loopback address
in IPv4.
•
An unspecified address is 0:0:0:0:0:0:0:0 (or ::). It cannot be assigned to any node. Before
acquiring a valid IPv6 address, a node fills this address in the source address field of IPv6 packets.
The unspecified address cannot be used as a destination IPv6 address.
Multicast addresses
IPv6 multicast addresses listed in
Table 6
are reserved for special purposes.
Table 6
Reserved IPv6 multicast addresses
Address
Application
FF01::1
Node-local scope all-nodes multicast address
FF02::1
Link-local scope all-nodes multicast address
FF01::2
Node-local scope all-routers multicast address
FF02::2
Link-local scope all-routers multicast address
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.
Interfaces generate EUI-64 address-based interface identifiers differently.
•
On an IEEE 802 interface (such as a VLAN interface)
The interface identifier is derived from the link-layer address (typically a MAC address) of the
interface. The MAC address is 48 bits long. To obtain an EUI-64 address-based interface identifier,
you must insert the hexadecimal number FFFE (16 bits of 1111111111111110) into the MAC
address (behind the 24th high-order bit), and set the universal/local (U/L) bit (which is the seventh
high-order bit) to 1, to make sure that the obtained EUI-64 address-based interface identifier is
globally unique.
Figure 44
shows how an EUI-64 address-based interface identifier is generated from a MAC
address.
Figure 44
Converting a MAC address into an EUI-64 address-based interface identifier