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    <title>IPv6 Addressing and Enabling IPv6 Routing </title>
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<a name="wp1073353"> </a><h1 class="pTitle">
IPv6 Addressing and Enabling IPv6 Routing

</h1>
<a name="wp1073355"> </a><p class="pBody">
IPv6 addresses are represented as a series of 16-bit hexadecimal fields separated by colons (:) in the 
format x:x:x:x:x:x:x:x. It is common for IPv6 addresses to contain successive hexadecimal fields of 
zeros. To make IPv6 addresses easier to use, two colons (::) may be used to compress successive 
hexadecimal fields of zeros at the beginning, middle, or end of an IPv6 address (the colons represent 
successive hexadecimal fields of zeros). By default, IPv6 addresses are not configured, and IPv6 
processing is disabled. You can configure IPv6 addresses on the following interface types:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073357"> </a><li class="pSmartList1">Gigabit Ethernet
</li>
<a name="wp1073358"> </a><li class="pSmartList1">Management
</li>
<a name="wp1073359"> </a><li class="pSmartList1">VLAN (Gigabit Ethernet subinterface)
</li>
<a name="wp1073360"> </a><li class="pSmartList1">VSAN
</li>
</ul></div>
<a name="wp1073361"> </a><p class="pBody">
Configuring a global IPv6 address on an interface automatically configures a link-local address and 
activates IPv6 for that interface. Additionally, the configured interface automatically joins the following 
required multicast groups for that link: 

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073362"> </a><li class="pSmartList1">Solicited-node multicast group FF02:0:0:0:0:1:FF00::/104 for each unicast address assigned to the 
interface
</li>
<a name="wp1073363"> </a><li class="pSmartList1">All-node link-local multicast group FF02::1
</li>
</ul></div>
<a name="wp1073364"> </a><p class="pBody">
This task explains how to assign IPv6 addresses to individual router interfaces and enable the processing 
of IPv6 traffic. By default, IPv6 addresses are not configured and IPv6 processing is disabled.

</p>
<a name="wp1073365"> </a><p class="pBody">
You can configure IPv6 addresses on the following interface types:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073366"> </a><li class="pSmartList1">Gigabit Ethernet
</li>
<a name="wp1073367"> </a><li class="pSmartList1">Management
</li>
<a name="wp1073368"> </a><li class="pSmartList1">VLAN (Gigabit Ethernet subinterface)
</li>
<a name="wp1073369"> </a><li class="pSmartList1">VSAN
</li>
</ul></div>
<a name="wp1084662"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> The IPv6 address  must be in the form documented in RFC 2373, where the address is specified in 
hexadecimal using 16-bit values between colons.<br />
<br />
The IPv6 prefix must be in the form documented in RFC 2373, where the address is specified in 
hexadecimal using 16-bit values between colons.<br />
<br />
The IPv6 prefix length is a decimal value that indicates how many of the high-order contiguous bits of 
the address comprise the prefix (the network portion of the address). A slash mark must precede the 
decimal value.

</p>
<a name="wp1073371"> </a><p class="pBody">
Configuring a global IPv6 address on an interface automatically configures a link-local address and 
activates IPv6 for that interface. Additionally, the configured interface automatically joins the following 
required multicast groups for that link: 

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073372"> </a><li class="pSmartList1">Solicited-node multicast group FF02:0:0:0:0:1:FF00::/104 for each unicast address assigned to the 
interface
</li>
<a name="wp1073373"> </a><li class="pSmartList1">All-node link-local multicast group FF02::1
</li>
<a name="wp1073374"> </a><p class="pListNote1">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> The solicited-node multicast address is used in the neighbor discovery process.

</p>
</ul></div>
<a name="wp1073375"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> The maximum number of IPv6 addresses (static and autoconfigured) allowed on an interface is eight, 
except on the management (mgmt 0) interface where only one static IPv6 address can be configured.

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

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