HP Cisco MDS 9216 Cisco MDS 9000 Family Fabric Manager Configuration Guide, Re - Page 470

PortChannel Protocol Chapter 23 Configuring PortChannels Send documentation comments to [email protected] Table 23-2 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 None of these ports are members of a of channel groups. The autocreation feature user-configured channel group. cannot be configured. You can form the PortChannel 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 PortChannel-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 PortChannel is applied to all ports in the channel group, and you can save the configuration for the PortChannel interface. Any administrative configuration made to the PortChannel is applied to all ports in the channel group, but the configurations are saved for the member ports; no configuration is saved for the PortChannel 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, or add/remove any of its members. The channel group is removed when no member ports exist. About Autocreation The autocreation protocol has the following functionality: • A port is not allowed to be configured as part of a PortChannel 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 PortChannel. • Aggregation occurs in one of two ways: - A port is aggregated into a compatible autocreated PortChannel. - A port is aggregated with another compatible port to form a new PortChannel. • Newly created PortChannels are allocated from the maximum possible PortChannel (128 for Generation 1 or a combination of Generation 1 and Generation 2 switches, or 256 for Generation 2 switches) in a decreasing order based on availability. If all 128 (or 256) numbers are used up, aggregation is not allowed. • You cannot change the membership or delete an autocreated PortChannel. • When you disable autocreation, all member ports are removed from the autocreated PortChannel. • 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. 23-18 Cisco MDS 9000 Family CLI Configuration Guide OL-16184-01, Cisco MDS SAN-OS Release 3.x