HP Cisco MDS 9020 Cisco MDS 9000 Family Fabric Manager Configuration Guide, Re - Page 702

Port Swapping Chapter 36 Configuring FICON Send documentation comments to [email protected] • If you swap a port in a module that has unlimited oversubscription ratios enabled with a port in a module that has limited oversubscription ratios, then you may experience a degradation in bandwidth. Tip If you check the Active=Saved check box on any FICON VSAN, then the swapped configuration is automatically saved to startup. Otherwise, you must explicitly save the running configuration immediately after swapping the ports. Once you swap ports, the switch automatically performs the following actions: • Shuts down both the old and new ports. • Swaps the port configuration. If you attempt to bring the port up, you must explicitly shut down the port to resume traffic. Note To view the latest FICON information, you must click the Refresh button. See the "Automatically Saving the Running Configuration" section on page 36-23. This section includes the following topics: • About Port Swapping, page 36-32 • Swapping Ports, page 36-33 About Port Swapping Be sure to follow these guidelines when using the FICON port swapping feature: • Port swapping is not supported for logical ports (PortChannels, FCIP links). Neither the old-port-number nor the new-port-number can be a logical port. • Port swapping is not supported between physical ports that are part of a PortChannel. Neither the old-port-number nor the new-port-number can be a physical port that is part of a PortChannel. • Before performing a port swap, the Cisco SAN-OS software performs a compatibility check. If the two ports have incompatible configurations, the port swap is rejected with an appropriate reason code. For example, if a port with BB_credits as 25 is being swapped with an OSM port for which a maximum of 12 BB_credits is allowed (not a configurable parameter), the port swapping operation is rejected. • Before performing a port swap, the Cisco SAN-OS software performs a compatibility check to verify the extended BB_credits configuration. • If ports have default values (for some incompatible parameters), then a port swap operation is allowed and the ports retain their default values. • Port tracking information is not included in port swapping. This information must be configured separately (see Chapter 67, "Configuring Port Tracking"). Note The 32-port module guidelines also apply for port swapping configurations . 36-32 Cisco MDS 9000 Family CLI Configuration Guide OL-16184-01, Cisco MDS SAN-OS Release 3.x