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    <title>PortChannel Modes </title>
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<a name="wp1072589"> </a><h1 class="pTitle">
PortChannel Modes

</h1>
<a name="wp1072590"> </a><p class="pBody">
You can configure each PortChannel with a channel group mode parameter to determine the PortChannel 
protocol behavior for all member ports in this channel group. The possible values for a channel group 
mode are as follows:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1072591"> </a><li class="pSmartList1">ON (default)&#8212;The member ports only operate as part of a PortChannel or remain inactive. In this 
mode, the PortChannel protocol is not initiated. However, if a PortChannel protocol frame is 
received from a peer port, the software indicates its nonnegotiable status. This mode is backward 
compatible with the existing implementation of PortChannels in releases prior to Release 2.0(1b), 
where the channel group mode is implicitly assumed to be ON. In Cisco MDS SAN-OS Releases 
1.3 and earlier, the only available PortChannel mode was the ON mode. PortChannels configured in 
the ON mode require you to explicitly enable and disable the PortChannel member ports at either 
end if you add or remove ports from the PortChannel configuration. You must physically verify that 
the local and remote ports are connected to each other.
</li>
<a name="wp1072592"> </a><li class="pSmartList1">ACTIVE&#8212;The member ports initiate PortChannel protocol negotiation with the peer port(s) 
regardless of the channel group mode of the peer port. If the peer port, while configured in a channel 
group, does not support the PortChannel protocol, or responds with a nonnegotiable status, it will 
default to the ON mode behavior. The ACTIVE PortChannel mode allows automatic recovery 
without explicitly enabling and disabling the PortChannel member ports at either end.
</li>
</ul></div>
<a name="wp1072596"> </a><p class="pBody">
<a href="pc08.html#wp1072603">Table&#160;10-1</a> compares ON and ACTIVE modes.

</p>
<a name="wp1072638"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1072603table1072597">
  <caption><a name="wp1072603"> </a><div class="pTableTitle">
Table&#160;10-1	Channel Group Configuration Differences&#160;

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1072607"> </a><p class="pCellHeading">
ON Mode

</p>
</th>
    <th><a name="wp1072609"> </a><p class="pCellHeading">
ACTIVE Mode

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072611"> </a><p class="pBody">
No protocol is exchanged.

</p>
</td>
    <td><a name="wp1072613"> </a><p class="pBody">
A PortChannel protocol negotiation is performed 
with the peer ports.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072615"> </a><p class="pBody">
Moves interfaces to the suspended state if its 
operational values are incompatible with the 
PortChannel.

</p>
</td>
    <td><a name="wp1072617"> </a><p class="pBody">
Moves interfaces to the isolated state if its 
operational values are incompatible with the 
PortChannel.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072619"> </a><p class="pBody">
When you add or modify a PortChannel member 
port configuration, you must explicitly disable 
(shut) and enable (no shut) the PortChannel 
member ports at either end.

</p>
</td>
    <td><a name="wp1072621"> </a><p class="pBody">
When you add or modify a PortChannel interface, 
the PortChannel automatically recovers.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072623"> </a><p class="pBody">
Port initialization is not synchronized.

</p>
</td>
    <td><a name="wp1072625"> </a><p class="pBody">
There is synchronized startup of all ports in a 
channel across peer switches.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072627"> </a><p class="pBody">
All misconfigurations are not detected as no 
protocol is exchanged.

</p>
</td>
    <td><a name="wp1072629"> </a><p class="pBody">
Consistently detect misconfigurations using a 
PortChannel protocol.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072631"> </a><p class="pBody">
Transitions misconfigured ports to the suspended 
state. You must explicitly disable (shut) and 
enable (no shut) the member ports at either end.

</p>
</td>
    <td><a name="wp1072633"> </a><p class="pBody">
Transitions misconfigured ports to the isolated 
state to correct the misconfiguration. Once you 
correct the misconfiguration, the protocol ensures 
automatic recovery.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072635"> </a><p class="pBody">
This is the default mode.

</p>
</td>
    <td><a name="wp1072637"> </a><p class="pBody">
You must explicitly configure this mode.

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

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