Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 36 Configuring SAN Port Channels
Port Channel Protocol
Tip When enabling autocreation in any switch in the Cisco Nexus 5000 Series, 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, a possible traffic
disruption may occur between these two switches as ports are automatically disabled and reenabled
when they are added to an autocreated SAN port channel.
Enabling and Configuring Autocreation
To configure automatic channel groups, perform this task:
The following example configures an automatic channel group:
switch(config)# interface fc2/3
switch(config-if)# channel-group auto
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. 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 channel group autocreation is implicitly disabled for all the
member ports.
Tip If you enable persistence, be sure to enable it at both ends of the SAN port channel.
Converting to Manually Configured Channel Groups
You can convert autocreated channel group to a user-configured channel group using the
san-port-channel channel-group-number persistent EXEC command. If the SAN port channel does not
exist, this command is not executed.
Command Purpose
Step 1
switch# configuration terminal
switch(config)#
Enters configuration mode.
Step 2
switch(config)# interface type slot/port
switch(config-if)#
Enters configuration mode for the specified
interface.
Step 3
switch(config- if)# channel-group auto
Automatically creates the channel group for the
selected interface(s).
switch(config- if)# no channel-group auto
Disables the autocreation of channel groups for this
interface, even if the system default configuration
may have autocreation enabled.