Cisco Systems DSC9148D8G48PK9 manual Autocreation

Chapter 6 Configuring PortChannels

Information About PortChannels

The channel group numbers are selected dynamically, and as such, the administrative configuration of the ports forming the channel group at either end are applicable to the newly created channel group. The channel group number being chosen dynamically may be different across reboots for the same set of PortChannels based on the order of ports that are initialized in the switch.

Table 6-2identifies the differences between user-configured and auto-configured channel groups.

Table 6-2 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	All ports included in the channel group participate
ports in the channel group. Incompatible ports	in the PortChannel—no member port becomes
remain in a suspended or isolated state depending	isolated or suspended; instead, the member port is
on the ON or ACTIVE mode configuration.	removed from the channel group when the link is
	found to be incompatible.
Any administrative configuration made to the	Any administrative configuration made to the
PortChannel is applied to all ports in the channel	PortChannel is applied to all ports in the channel
group, and you can save the configuration for the	group, but the configurations are saved for the
PortChannel interface.	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	You cannot remove a channel group, or add/remove
members to a channel group.	any of its members. The channel group is removed
	when no member ports exist.

Note Autocreation is not supported as of MDS NX-OS Release 4.1(1b) and later.

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.

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x		6-11