Ipv6 Address Type: Multicast - HP Cisco MDS 9216 - Fabric Switch Configuration Manual

Chapter 54 Configuring IPv6 for Gigabit Ethernet Interfaces
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m

IPv6 Address Type: Multicast

An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8 (1111 1111). An IPv6
multicast address is an identifier for a set of interfaces that typically belong to different nodes. A packet
sent to a multicast address is delivered to all interfaces identified by the multicast address. The second
octet following the prefix defines the lifetime and scope of the multicast address. A permanent multicast
address has a lifetime parameter equal to 0; a temporary multicast address has a lifetime parameter equal
to 1. A multicast address has the scope of a node, link, site, or organization, or a global scope has a scope
parameter of 1, 2, 5, 8, or E, respectively. For example, a multicast address with the prefix FF02::/16 is
a permanent multicast address with a link scope.
address.
Figure 54-4
1111 1111
F
IPv6 hosts are required to join (receive packets destined for) the following multicast groups:
•
•
OL-16184-01, Cisco MDS SAN-OS Release 3.x
IPv6 Multicast Address Format
0
4 bits 4 bits
F Lifetime Scope
8 bits 8 bits
All-node multicast group FF02::1.
Solicited-node multicast group FF02:0:0:0:0:1:FF00:0000/104 concatenated with the low-order 24
bit of the unicast address.
The solicited-node multicast address is a multicast group that corresponds to an IPv6 unicast
address. IPv6 nodes must join the associated solicited-node multicast group for every unicast
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 address. (See Figure
to the IPv6 address 2037::01:800:200E:8C6C is FF02::1:FF0E:8C6C. Solicited-node addresses are
used in neighbor solicitation messages.
Figure 54-4
128 bits
Interface ID
0 if permanent
Lifetime =
1 if temporary
1 = node
2 = link
Scope =
5 = site
8 = organization
E = global
54-5.) For example, the solicited-node multicast address corresponding
Cisco MDS 9000 Family CLI Configuration Guide
shows the format of the IPv6 multicast
About IPv6
54-5