HP Cisco MDS 9216A Cisco MDS 9000 Family Fabric Manager Configuration Guide, R - Page 468

PortChannel Protocol Chapter 23 Configuring PortChannels Send documentation comments to [email protected] About Interface Deletion from a PortChannel When a physical interface is deleted from the PortChannel, the channel membership is automatically updated. If the deleted interface is the last operational interface, then the PortChannel status is changed to a down state. Deleting an interface from a PortChannel decreases the channel size and bandwidth of the PortChannel. • If you use the default ON mode to avoid inconsistent states across switches and to maintain consistency across switches, then the ports shut down. You must explicitly enable those ports again. • If you use the ACTIVE mode, then the PortChannel ports automatically recover from the deletion. After the members are deleted, regardless of the mode (ACTIVE and ON) used, the ports at either end are gracefully brought down, indicating that no frames are lost when the interface is going down (see the "32-Port Switching Module Configuration Guidelines" section on page 23-2 and "Graceful Shutdown" section on page 20-11). Deleting an Interface from a PortChannel To delete a physical interface (or a range of physical interfaces) from a PortChannel using Fabric Manager, follow these steps: Step 1 Step 2 Step 3 Step 4 Expand ISLs and then select Port Channels in the Physical Attributes pane. You see the PortChannels configured in the Information pane. Click the Channels tab and find the switch and PortChannel that you want to edit. Remove the interface or list of interfaces you want deleted in the Members the Admin column. Click the Apply Changes icon to save any modifications. PortChannel Protocol In earlier Cisco SAN-OS releases, PortChannels required additional administrative tasks to support synchronization. The Cisco SAN-OS software provides robust error detection and synchronization capabilities. You can manually configure channel groups or they can be automatically created. In both cases, the channel groups have the same capability and configurational parameters. Any change in configuration applied to the associated PortChannel interface is propagated to all members of the channel group. A protocol to exchange PortChannel configurations is available in all Cisco MDS switches. This addition simplifies PortChannel management with incompatible ISLs. An additional autocreation mode enables ISLs with compatible parameters to automatically form channel groups without manual intervention. The PortChannel protocol is enabled by default. The PortChannel protocol expands the PortChannel functional model in Cisco MDS switches. It uses the exchange peer parameters (EPP) services to communicate across peer ports in an ISL. Each switch uses the information received from the peer ports along with its local configuration and operational values to decide if it should be part of a PortChannel. The protocol ensures that a set of ports are eligible to be part of the same PortChannel. They are only eligible to be part of the same port channel if all the ports have a compatible partner. 23-16 Cisco MDS 9000 Family CLI Configuration Guide OL-16184-01, Cisco MDS SAN-OS Release 3.x