IBM 2109 - SAN Fibre Channel Switch Model S16, Service Manual

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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 <long_distance_level>
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
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