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54-4
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 54 Configuring IPv6 for Gigabit Ethernet Interfaces
About IPv6
Cisco MDS NX-OS supports IEEE 802 interface types (for example, Gigabit Ethernet interfaces). The
first three octets (24
bits) are taken from the Organizationally Unique Identifier (OUI) of the 48-bit
link-layer address (MAC address) of the interface, the fourth and fifth octets (16
bits) are a fixed
hexadecimal value of FFFE, and the last three octets (24
bits) are taken from the last three octets of the
MAC address. The construction of the interface ID is completed by setting the Universal/Local (U/L)
bit—the seventh bit of the first octet—to a value of 0 or 1. A value of 0 indicates a locally administered
identifier; a value of 1 indicates a globally unique IPv6 interface identifier (see
Figure 54-2).
Figure 54-2 Interface Identifier Format
Link-Local Address
A link-local address is an IPv6 unicast address that is automatically configured on an interface using the
link-local prefix FE80::/10 and the interface identifier in the modified EUI-64 format. Link-local
addresses are used in the neighbor discovery protocol and the stateless autoconfiguration process. Nodes
on a local link can use link-local addresses to communicate.
Figure 54-3 shows the structure of a
link-local address.
Figure 54-3 Link-Local Address Format
00 FF FE
FF FE
02 FEFF
90
90 27 17 FC 0F
00 90 27 17 FC 0F
00 27 17 FC 0F
90 17 FC 0F
U = 1
000000U0
27
U = 0
Where U is 0 (not unique)
or 1 (unique)
144884
52669
128 bits
10 bits
1111 1110 10
Interface ID0
FE80::/10
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