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Chapter 5: Fibre Channel Hub Operation and Management
Bypassing Ports
The Fibre Channel Hub bypasses a port automatically when it receives three consecutive
LIP F8 sequences from the port. This sequence is generated when the port does not
receive a valid signal from the device cabled to the port, such as when a cable is replaced
or a device is disconnected for routine maintenance. The hub can also bypass a port that
an administrator disables. This section explains how to bypass a port using the
command-line interface and the Internet browser interface, in separate subsections; it
also explains how to change the default settings for LIP F8 and F7 bypass:
•
“Bypassing Ports: Command-Line Interface” on page 66
•
“Bypassing Ports: Internet Browser Interface” on page 67
•
“Changing LIP F8 and LIP F7 Settings” on page 71
Bypassing Ports: Command-Line Interface
Note:
Bypassing a port disables access to the device connected to it; perform any
required steps to prevent loss of I/O.
To use the command-line interface to force-bypass a port, a user with administrator
privilege enters
Server>>change hub port [
port
|
all
] bypass enable
where
port
is the port to bypass. You can enter a number (for example, 4), a range of
numbers separated by a hyphen (for example, 2-4), or a series of numbers separated by
commas or single spaces (for example, 2, 4).
*
To bypass all ports on the loop, enter
all
.
(The software does not prompt for confirmation.)
When a port is bypassed, its LED goes dark, and its status changes in the Status screen.
The following example bypasses ports 2, 3, 4, 6, and 9:
Server>>change hub port 2-4, 6, 9 bypass enable
*
Cascading or segmenting hubs does not change port numbering.
