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23-23
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 23 Configuring PortChannels
PortChannel Protocols
• Once the last member is removed from an autocreated PortChannel, the channel is automatically
deleted and the number is released for reuse.
• An autocreated PortChannel is not persistent through a reboot. An autocreated PortChannel can be
manually configured to appear the same as a persistent PortChannel. Once the PortChannel is made
persistent, the autocreation feature is disabled in all member ports.
• You can enable or disable the autocreation feature on a per-port basis or for all ports in the switch.
When this configuration is enabled, the channel group mode is assumed to be active. The default for
this task is disabled.
• If autocreation of channel groups is enabled for an interface, you must first disable autocreation
before downgrading to earlier software versions or before configuring the interface in a manually
configured channel group.
Tip When enabling autocreation in any switch in the Cisco MDS 9000 Family, we recommend that you retain
at least one interconnected port between the switches without any autocreation configuration. If all ports
between two switches are configured with the autocreation feature at the same time, you may face a
possible traffic disruption between these two switches as the ports are automatically disabled and
reenabled when ports are added to an autocreated PortChannel.
Enabling and Configuring Autocreation
To configure PortChannel autocreation, check the Dynamically form Port Channel Group from
selected ISLs option in the PortChannel Wizard. For more information, see the “Configuring
PortChannels Using the Wizard” section on page 23-11.
About Manually Configured Channel Groups
A user-configured channel group cannot be converted to an autocreated channel group. However, you
can convert an autocreated channel group to a manual channel group. Once performed, this task is
irreversible. The channel group number does not change, but the member ports operate according to the
properties of the manually configured channel group, and the autocreation of channel group is implicitly
disabled for all member ports.
Tip If you enable persistence, be sure to enable it at both ends of the PortChannel.
Converting to Manually Configured Channel Groups
To convert an autocreated channel group to a user-configured channel group using Fabric Manager,
follow these steps:
Step 1 Expand ISLs and then select Port Channels in the Physical Attributes pane. Click the Protocol tab.
You see the switch protocols as shown in Figure 23-16.
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