IBM 2109 Service Guide - Page 82
Accessing through the Telnet interface, Long Distance Fabric [0]
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| each neighboring port (the second port in a two-port pair). If incorrectly set, the | fabric will segment until the configurations in each segment match. | To set the long distance fabric mode bit: | 1. Log into the switch using Telnet. | 2. Type switchDisable | 3. Type configure | 4. Type 1 on the following line: | Long Distance Fabric [0]: | There are three possible levels for a port: | v Level 0 Reconfigures the port as a regular switch port. The number of buffers | reserved for the port supports links up to 10 km (6.2 miles). | v Level 1 Distances up to 50 km (31 miles). A total of 27 full-size frame buffers are | reserved for the port. | v Level 2 Distances up to 100 km (62 miles). A total of 60 full-size frame buffers | are reserved for the port. | Ports are grouped into quads, each of which consists of four adjacent ports that | share a common pool of frame buffers. The possible quad groupings are ports 0-3, | 4-7, 8-11, and 12-15. Certain buffers are dedicated for each port, but others are | shared among the ports. In Extended Fabric mode, one port is given an increase of | dedicated buffers from this pool. Because the total number of frame buffers in a | quad is limited, only one port in the quad can be configured for use in an Extended | Fabric at any one time. When one port is configured as a long distance port, the | remaining ports in the quad must be configured as regular switch ports (level 0). | Accessing through the Telnet interface | You can configure a port to support long distance links by using the | portCfgLongDistance Telnet command, which is described in the following section. | The portCfgLongDistance command configures a port to support long distance | links. | Synopsis portCfgLongDistance port_number | Availability Administrator. The 2109 Extended Fabrics license key is required to | see this command. | Description Use this command to specify the allocation of enough full-size | frame buffers on a particular port to support a long distance link of | up to 100 km (62 miles). The port can be used as either an Fx_Port | or an E_Port. The configuration is saved in the nonvolatile memory | and is persistent across switch restart or power cycles. | When this command is invoked without the optional operand, you | are prompted to enter the long distance level number. The level | value must be one of the following: | Level effect | 0 Reconfigures the port as a regular switch port. The number | of buffers reserved for the port supports links up to 10 km | (6.2 miles). | 1 Level one long distance, up to 50 km (31 miles). A total of | 27 full-size frame buffers are reserved for the port. 66 IBM SAN Fibre Channel Switch: 2109 Model S16 Installation and Service Guide