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SET PORT FAN_OUT_MODE
SET PORT
FAN_OUT_MODE
Use the SET PORT FAN_OUT_MODE command to make a CoreBuilder 5000
Token Ring port compatible with fan-out devices such as the IBM 8228. The
fan-out function allows multiple stations to attach to a single port.
This feature requires that you have loaded Token Ring Media Module code
Version v1.2 or later.
This feature is required because not all fan-out devices assert phantom
(phantom indicates the presence of a station). When fan-out mode is disabled
(the default), CoreBuilder 5000 Token Ring ports automatically wrap and
unwrap based on the detection of phantom. In this mode, a fan-out device
requires an adapter to assert phantom before it is allowed to insert into the
ring. When fan-out mode is enabled, the port unwraps regardless of the
presence of phantom.
CAUTION:
Enabling fan-out mode with no station or fan-out device attached
breaks the ring and causes beaconing. This problem must be avoided because
beacon recovery briefly disrupts all users on the ring.
Because phantom is ignored when fan-out mode is enabled, the only way to
clear a BEACON_WRAP or WRONG_SPEED condition when a port is in fan-out
mode is to disable, then reenable the port. Ring speed detection does not
operate when a port is in fan-out mode. Beacon recovery wraps fan-out devices
that contain wrong speed stations.
When you disable a port, fan-out mode is automatically disabled. This forces
you to explicitly enable fan-out mode when you reenable the port. This extra
step helps prevent you from enabling fan-out mode with no device attached.
Format
Example
The following command disables fan-out mode on port 6.2:
CB5000> set port 6.2 fan_out_mode disable
Port 06.02 fan_out_mode set to DISABLED.
Related Commands
SET PORT NETWORK
SHOW PORT
set port fan_out_mode
disable
enable
slot.port
slot.
all
slot.port Identifies the port for this operation.
slot (1 through 17) is the slot number location of a module in the hub
and port (1 through 24) is the port number on the specified module.
For example, to identify port 4 on the module in slot 6, enter
6.4
slot.
all
Specifies that all ports on the module are affected by this operation.
disable
Disables fan-out mode for the identified port.
The factory setting is all ports disabled.
enable
Enables fan-out mode for the identified port.