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
1-14
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 1 Configuring SAN Port Channels
Port Channel Protocol
identifies the differences between user-configured and auto-configured channel groups.
Autocreation Guidelines
When using the autocreation protocol, follow these guidelines:
•
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.
Table 1-2
Channel Group Configuration Differences
User-Configured Channel Group
Autocreated Channel Group
Manually configured by the user.
Created automatically when compatible links come
up between two compatible switches, if channel
group autocreation is enabled in all ports at both
ends.
Member ports cannot participate in autocreation
of channel groups. The autocreation feature
cannot be configured.
None of these ports are members of a
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.
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, and you can save the configuration
for the port channel interface.
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 can remove any channel group and add
members to a channel group.
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.