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<a name="wp1073704"> </a><h1 class="pTitle">
World Wide Names

</h1>
<a name="wp1073706"> </a><p class="pBody">
The world wide name (WWN) in the switch is equivalent to the Ethernet MAC address. As with the MAC 
address, you must uniquely associate the WWN to a single device. The principal switch selection and 
the allocation of domain IDs rely on the WWN. The WWN manager, a process-level manager residing 
on the switch’s supervisor module, assigns WWNs to each switch. 

</p>
<a name="wp1073707"> </a><p class="pBody">
Cisco MDS 9000 Family switches support three network address authority (NAA) address formats (see 
<a href="adv07.html#wp1073717">Table&#160;28-1</a>).

</p>
<a name="wp1073764"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1073717table1073711">
  <caption><a name="wp1073717"> </a><div class="pTableTitle">
Table&#160;28-1	Standardized NAA WWN Formats&#160;

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th colspan="1" rowspan="2"><a name="wp1073725"> </a><p class="pCellHeading">
NAA Address

</p>
</th>
    <th colspan="1" rowspan="2"><a name="wp1073727"> </a><p class="pCellHeading">
NAA Type

</p>
</th>
    <th colspan="2" rowspan="2"><a name="wp1073729"> </a><p class="pCellHeading">
 WWN Format

</p>
</th>
</tr>
  <tr bgcolor="#CCCCCC" align="left" valign="middle"></tr>
  <tr align="left" valign="top">    <td><a name="wp1073741"> </a><p class="pBody">
IEEE 48-bit address

</p>
</td>
    <td><a name="wp1073743"> </a><p class="pBody">
Type 1 = 0001b

</p>
</td>
    <td><a name="wp1073745"> </a><p class="pBody">
000 0000 0000b

</p>
</td>
    <td><a name="wp1073747"> </a><p class="pBody">
48-bit MAC address

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073749"> </a><p class="pBody">
IEEE extended

</p>
</td>
    <td><a name="wp1073751"> </a><p class="pBody">
Type 2 = 0010b

</p>
</td>
    <td><a name="wp1073753"> </a><p class="pBody">
Locally assigned

</p>
</td>
    <td><a name="wp1073755"> </a><p class="pBody">
48-bit MAC address

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073757"> </a><p class="pBody">
IEEE registered

</p>
</td>
    <td><a name="wp1073759"> </a><p class="pBody">
Type 5 = 0101b

</p>
</td>
    <td><a name="wp1073761"> </a><p class="pBody">
IEEE company ID: 24 bits

</p>
</td>
    <td><a name="wp1073763"> </a><p class="pBody">
VSID: 36 bits

</p>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp1073765"> </a><p class="pCaution">
<table border="0">
<tr>
<td>
<strong>Caution	&nbsp;&nbsp;&nbsp;</strong>
</td>
<td>
<p>Changes to the world-wide names should be made by an administrator or individual who is completely 
familiar with switch operations.
</p>
</td>
</tr>
</table>

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

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