Cisco Nexus 5500 Series NX-OS Configuration Manual page 131

Configuring SAN Port Channels
configurations. Link A4-B4 operates as an individual link, because it is not compatible with the existing
member ports in the channel group.
Figure 26: Autocreating Channel Groups
The channel group numbers are assigned dynamically (when the channel group is formed).
The channel group number may change across reboots for the same set of port channels depending on the
initialization order of the ports.
The following table identifies the differences between user-configured and auto-configured channel groups.
Table 15: Channel Group Configuration Differences
User-Configured Channel Group
Manually configured by the user.
Member ports cannot participate in autocreation of
channel groups. The autocreation feature cannot be
configured.
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.
OL-30895-01
Autocreated Channel Group
Created automatically when compatible links come
up between two compatible switches, if channel group
autocreation is enabled in all ports at both ends.
None of these ports are members of a user-configured
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.
Cisco Nexus 5500 Series NX-OS SAN Switching Configuration Guide, Release 7.x
SAN Port Channel Protocol
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