Cisco Systems DSC9148D8G48PK9 manual Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide

Chapter 3 Configuring Fibre Channel Interfaces

Guidelines and Limitations

•The maximum number of PortChannels allowed is 256 if all switching modules are Generation 2 or Generation 3, or both.

•The maximum number of PortChannels allowed is 128 whenever there is a Generation 1 switching module in use with a Generation 2 or Generation 3 switching module.

•Ports need to be configured in dedicated rate mode on the Generation 2 and Generation 3 switching module interfaces to be used in the PortChannel.

Note The number of PortChannels allowed does not depend on the type of supervisor module. However, Generation 3 modules require the Supervisor 2 module on the MDS 9506 and 9509 switches.

The Generation1, Generation 2, and Generation 3 modules have the following restrictions for

PortChannel configuration:

•Generation 1 switching module interfaces do not support auto speed with a maximum of 2 Gbps.

•Generation 1 and Generation 2 module interfaces do not support auto speed with maximum of 4 Gbps.

•Generation 2 and Generation 3 switching module interfaces cannot be forcefully added to a PortChannel if sufficient resources are not available.

Note Before adding a Generation 2 or Generation 3 interface to a PortChannel, use the show port-resources module command to check for resource availability.

When configuring PortChannels on switches with Generation 1, Generation 2, and Generation 3 switching modules, follow one of these procedures:

•Configure the PortChannel, and then configure the Generation 2 and Generation 3 interfaces to auto with a maximum of 2 Gbps.

•Configure the Generation 1 switching modules followed by the Generation 2 switching modules, and then the Generation 3 switching modules, and then configure the PortChannel.

When configuring PortChannels on switches with only Generation 2 and Generation 3 switching modules, follow one of these procedures:

•Configure the PortChannel, and then configure the Generation 3 interfaces to auto with a maximum of 4 Gbps.

•Configure the Generation 2 switching modules, followed by the Generation 3 switching modules, and then configure the PortChannel.

Table 3-11describes the results of adding a member to a PortChannel for various configurations.

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
3-22	OL-29284-01, Release 6.x