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<a name="wp1074699"> </a><h1 class="pTitle">
Channel Group Creation

</h1>
<a name="wp1074700"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Channel groups are not supported on internal ports in the Cisco Fabric Switch for HP c-Class 
BladeSystem and the Cisco Fabric Switch for IBM BladeSystem.

</p>
<a name="wp1074704"> </a><p class="pBody">
Assuming link A1-B1 comes up first, that link is operational as an individual link.When the next link 
comes up, for example, A2-B2, the PortChannel protocol identifies if this link is compatible with link 
A1-B1 and automatically creates channel groups 10 and 20 in the respective switches. If link A3-B3 can 
join the channel groups (the PortChannels), the respective ports have compatible configurations. If link 
A4-B4 operates as an individual link, it is because of the incompatible configuration of the two end ports 
with the other member ports in this channel group.

</p>
<a name="wp1074711"> </a><p class="pBody">
The channel group numbers are selected dynamically, and as such, the administrative configuration of 
the ports forming the channel group at either end are applicable to the newly created channel group. The 
channel group number being chosen dynamically may be different across reboots for the same set of 
PortChannels based on the order of ports that are initialized in the switch. 

</p>
<a name="wp1074715"> </a><p class="pBody">
<a href="pc15.html#wp1074722">Table&#160;10-2</a> identifies the differences between user-configured and auto-configured channel groups.

</p>
<a name="wp1074749"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1074722table1074716">
  <caption><a name="wp1074722"> </a><div class="pTableTitle">
Table&#160;10-2	Channel Group Configuration Differences&#160;

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1074726"> </a><p class="pCellHeading">
User-Configured Channel Group

</p>
</th>
    <th><a name="wp1074728"> </a><p class="pCellHeading">
Autocreated Channel Group

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1074730"> </a><p class="pBody">
Manually configured by the user. 

</p>
</td>
    <td><a name="wp1074732"> </a><p class="pBody">
Created automatically when compatible links come 
up between two compatible switches, if channel 
group autocreation is enabled in all ports at both 
ends.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1074734"> </a><p class="pBody">
Member ports cannot participate in autocreation 
of channel groups. The autocreation feature 
cannot be configured.

</p>
</td>
    <td><a name="wp1074736"> </a><p class="pBody">
None of these ports are members of a 
user-configured channel group.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1074738"> </a><p class="pBody">
You can form the PortChannel with a subset of the 
ports in the channel group. Incompatible ports 
remain in a suspended or isolated state depending 
on the ON or ACTIVE mode configuration.

</p>
</td>
    <td><a name="wp1074740"> </a><p class="pBody">
All ports included in the channel group participate 
in the PortChannel&#8212;no member port becomes 
isolated or suspended; instead, the member port is 
removed from the channel group when the link is 
found to be incompatible.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1074742"> </a><p class="pBody">
Any administrative configuration made to the 
PortChannel is applied to all ports in the channel 
group, and you can save the configuration for the 
PortChannel interface.

</p>
</td>
    <td><a name="wp1074744"> </a><p class="pBody">
Any administrative configuration made to the 
PortChannel is applied to all ports in the channel 
group, but the configurations are saved for the 
member ports; no configuration is saved for the 
PortChannel interface. You can explicitly convert 
this channel group, if required.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1074746"> </a><p class="pBody">
You can remove any channel group and add 
members to a channel group.

</p>
</td>
    <td><a name="wp1074748"> </a><p class="pBody">
You cannot remove a channel group, or add/remove 
any of its members. The channel group is removed 
when no member ports exist.

</p>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp1074750"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Autocreation is not supported as of MDS NX-OS Release 4.1(1b) and later.

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

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