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    <title>IPv6 Address Type: Multicast </title>
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<a name="wp1088795"> </a><h1 class="pTitle">
IPv6 Address Type: Multicast

</h1>
<a name="wp1073060"> </a><p class="pBody">
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&#160;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. IPv6 hosts are required to join (receive packets destined 
for) the following multicast groups:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073061"> </a><li class="pSmartList1">All-node multicast group FF02::1.
</li>
<a name="wp1073062"> </a><li class="pSmartList1">Solicited-node multicast group FF02:0:0:0:0:1:FF00:0000/104 concatenated with the low-order 24 
bit of the unicast address.
</li>
<a name="wp1073063"> </a><p class="pListBodyLevel1">
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.  For example, the solicited-node multicast address corresponding to the IPv6 
address 2037::01:800:200E:8C6C is FF02::1:FF0E:8C6C. Solicited-node addresses are used in 
neighbor solicitation messages. 

</p>
</ul></div>
<a name="wp1073075"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> There are no broadcast addresses in IPv6. IPv6 multicast addresses are used instead of broadcast 
addresses.

</p>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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