Autocreation Guidelines - Cisco AJ732A - MDS 9134 Fabric Switch Configuration Manual

Chapter 36 Configuring SAN Port Channels
S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
Table 36-2
User-Configured Channel Group
You can form the SAN port channel 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.
Any administrative configuration made to the
SAN port channel is applied to all ports in the
channel group, and you can save the configuration
for the port channel interface.
You can remove any channel group and add
members to a channel group.

Autocreation Guidelines

When using the autocreation protocol, follow these guidelines:
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OL-16597-01
Channel Group Configuration Differences (continued)
A port is not allowed to be configured as part of a SAN port channel when the autocreation feature
is enabled. These two configurations are mutually exclusive.
Autocreation must be enabled in both the local and peer ports to negotiate a SAN port channel.
Aggregation occurs in one of two ways:
– A port is aggregated into a compatible autocreated SAN port channel.
– A port is aggregated with another compatible port to form a new SAN port channel.
Newly created SAN port channels are allocated from the maximum possible port channel number in
a decreasing order based on availability. If all port channel numbers are used up, aggregation is not
allowed.
You cannot change the membership or delete an autocreated SAN port channel.
When you disable autocreation, all member ports are removed from the autocreated SAN port
channel.
Once the last member is removed from an autocreated SAN port channel, the channel is
automatically deleted and the number is released for reuse.
An autocreated SAN port channel is not persistent through a reboot. An autocreated SAN port
channel can be manually configured to appear the same as a persistent SAN port channel. Once the
SAN port channel 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.
Autocreated Channel Group
All ports included in the channel group participate
in the SAN port channel. 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.
Any administrative configuration made to the SAN
port channel is applied to all ports in the channel
group, but the configurations are saved for the
member ports; no configuration is saved for the
port channel interface. You can explicitly convert
this channel group, if required.
You cannot remove a channel group. You cannot
add members to the channel group or remove
members. The channel group is removed when no
member ports exist.
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
Port Channel Protocol
36-13