Cisco Nexus 7000 Series Configuration Manual page 72

Information About IPv6
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .
Figure 3-6
1111 1111
F
8 bits
IPv6 nodes (hosts and routers) are required to join (where received packets are destined for) the
following multicast groups:
• All-nodes multicast group FF02:0:0:0:0:0:0:1 (the scope is link-local)
• Solicited-node multicast group FF02:0:0:0:0:1:FF00:0000/104 for each of its assigned unicast and
anycast addresses
IPv6 routers must also join the all-routers multicast group FF02:0:0:0:0:0:0:2 (the scope is link-local).
The solicited-node multicast address is a multicast group that corresponds to an IPv6 unicast or anycast
address. IPv6 nodes must join the associated solicited-node multicast group for every unicast and
anycast address to which it is assigned. The IPv6 solicited-node multicast address has the prefix
FF02:0:0:0:0:1:FF00:0000/104 concatenated with the 24 low-order bits of a corresponding IPv6 unicast
or anycast address (see
to the IPv6 address 2037::01:800:200E:8C6C is FF02::1:FF0E:8C6C. Solicited-node addresses are used
in neighbor solicitation messages.
Figure 3-7
IPv6 unicast or anycast address
Solicited-node multicast address
FF02
Note IPv6 has no broadcast addresses. IPv6 multicast addresses are used instead of broadcast addresses.
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
3-8
IPv6 Multicast Address Format
128 bits
0
4 bits 4 bits
F Lifetime Scope
8 bits
Figure 3-7). For example, the solicited-node multicast address that corresponds
IPv6 Solicited-Node Multicast Address Format
Prefix
0
128 bits
Interface ID
0 if permanent
Lifetime =
1 if temporary
1 = node
2 = link
Scope =
5 = site
8 = organization
E = global
Interface ID
24 bits
1 FF Lower 24
Chapter 3 Configuring IPv6
OL-20002-02