HP A7533A HP StorageWorks Fabric OS 6.x administrator guide (5697-0015, May 20 - Page 375
Initializing trunking on ports, Monitoring traffic
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• Determine the optimal number of trunking groups between each set of linked switches, depending on traffic patterns and port availability. The goal is to avoid traffic congestion without unnecessarily using ports that could be used to attach other switches or devices. Consider these points: • Each physical ISL uses two ports that could otherwise be used to attach node devices or other switches. • Trunking groups can be used to resolve ISL oversubscription if the total capability of the trunking group is not exceeded. • Consider how the addition of a new path will affect existing traffic patterns: • A trunking group has the same link cost as the master ISL of the group, regardless of the number of ISLs in the group. This allows slave ISLs to be added or removed without causing data to be rerouted, because the link cost remains constant. • The addition of a path that is shorter than existing paths causes traffic to be rerouted through that path. • The addition of a path that is longer than existing paths may not be useful because the traffic will choose the shorter paths first. • Plan for future bandwidth addition to accommodate increased traffic. For trunking groups over which traffic is likely to increase as business requirements grow, consider leaving one or two ports in the group available for future nondisruptive addition of bandwidth. • Consider creating redundant trunking groups where additional ports are available or paths are particularly critical. This helps to protect against oversubscription of trunking groups, multiple ISL failures in the same group, and the rare occurrence of an ASIC failure. • To provide the highest level of reliability, deploy trunking groups in redundant fabrics to further ensure ISL failures do not disrupt business operations. Initializing trunking on ports After you unlock the ISL Trunking license, you must reinitialize the ports being used for ISLs so that they recognize that trunking is enabled. This procedure only needs to be performed one time. To reinitialize the ports, you can either disable and then re-enable the switch, or disable and then re-enable the affected ports. To disable and re-enable the switch: 1. Connect to the switch and log in as admin. 2. Enter the switchDisable command. 3. Enter the switchEnable command. To disable and re-enable ports: 1. Connect to the switch and log in as admin. 2. Enter the portDisable command. The format is: portDisable [slot/]port On directors, slot is the slot number and port is the port number of the port you want to disable. 3. Enter the portEnable command.The format is: portEnable [slot/]port On directors, slot is the slot number and port is the port number of the port you want to enable. Monitoring traffic To implement ISL Trunking effectively, you must monitor fabric traffic to identify congested paths or to identify frequently dropped links. While monitoring changes in traffic patterns, you can adjust the fabric design accordingly, such as by adding, removing, or reconfiguring ISLs and trunking groups in problem areas. Fabric OS 6.x administrator guide 375
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