HP StorageWorks 8/80 HP StorageWorks Fabric OS 6.1.x administrator guide (5697 - Page 373

Disabling F_Port trunking 1. Connect to the switch and log in as admin. 2. Enter the portTrunkArea --disable command. switch:admin> porttrunkarea --disable 36-39 ERROR: port 36 has to be disabled Disable each port prior to removing ports from the TA. Then reissue the command: switch:admin> porttrunkarea --disable 36-39 Trunk area 37 disabled for ports 36, 37, 38 and 39. F_Port Trunking Monitoring For F_Port masterless trunking, you must install Filter, EE or TT monitors on the F_Port trunk port. Whenever the master port changes, it is required to move the monitor to the new master port. For example, if a master port goes down, a new master is selected from the remaining slave ports. APM must delete the monitor from the old master and install the monitor on new master port. If you attempt to add a monitor to a slave port, it is automatically added to the master port. Configuration management for trunk areas Ports from different ADs are not allowed to join the same Trunk Area group. The portTrunkArea command prevents the different AD's from joining the TA group. When you assign a TA, the ports within the TA group will have the same Index. The Index that was assigned to the ports is no longer part of the switch. Any Domain,Index (D,I) AD that was assumed to be part of the domain may no longer exist for that domain because it was removed from the switch. Example: How Trunk Area assignment affect the port Domain,Index If you have AD1: 3,7; 3,8; 4,13; 4,14 and AD2: 3,9; 3,10, and then create a TA with Index 8 with ports that have index 7, 8, 9, and 10. Then index 7, 9, and 10 are no longer with domain 3. This means that AD2 does not have access to any ports because index 9 and 10 no longer exist on domain 3. This also means that AD1 no longer has 3,7in effect because Index 7 no longer exists for domain 3. AD1's 3,8, which is the TA group, can still be seen by AD1 along with 4,13 and 4,14. A port within a TA can be removed, but this adds the Index back to the switch. For example, the same AD1 and AD2 with TA 8 holds true. If you remove port 7 from the TA, it adds Index 7 back to the switch. That means AD1's 3,7 can be seen by AD1 along with 3,8; 4,13 and 4,14. Trunking for Access Gateway On switches running in Access Gateway mode, the masterless trunking feature trunks N_Ports because only the external port or the N_Port can connect to an AG switch. After you map or assign F_Ports to an N_Port, the N_Port distributes frames across a set of available path links on the AG switch to an adjacent edge switch. Following are the advantages of N_Port trunking: When one or more N_Ports in a trunk group goes offline, there is no change in the PID for the F_Port(s) that were mapped to the N_Port(s) as long as at least one N_Port in the trunk group is active. This provides for a transparent path failover and failback within the trunk group. N_Port links are more efficient because of the trunking algorithm implemented in the switching ASICs that distributes the I/O more evenly across the N_Ports. Trunk groups cannot span across multiple N_Port groups within a switch in AG mode. Multiple trunk groups are allowed within the same N_Port group. For additional information on how to configure ports in Access Gateway mode, see the Access Gateway Administrator's Guide. Fabric OS 6.1.x administrator guide 373