User Manual

110 Administering extended fabrics
To configure an extended ISL:
1. Connect to the switch and log in as admin.
2. If the fabric contains a mix of switches, use the configure command to make sure the fabric-wide
configuration parameter fabric.ops.mode.longDistance is set to 0 on all switches in the
fabric.
If the fabric contains only HP StorageWorks 1 GB switches, use the switchdisable command to
disable the switch and then use the configure command to set the fabric-wide configuration
parameter fabric.ops.mode.longDistance to 1 on all switches in the fabric. The SAN Switch
4/32 cannot be part of such a fabric.
3. Issue the portcfglongdistance command, using the following syntax:
portcfglongdistance [slot/]port [distance_level] [vc_translation_link_init]
[desired_distance]
4. Repeat step 3 for the remote extended ISL port. Both the local and remote extended ISL ports must be
configured to the same distance level. When the connection is initiated, the fabric reconfigures.
The following example configures slot 1, port 1 for the LD link distance mode, enables the extended link
initialization sequence, and sets the desired distance to 50 kilometers:
where:
slot Specifies the slot number for the Core Switch 2/64 and the SAN
Director 2/128. This option is not applicable to fixed-port switches. The
slot number must be followed by a slash ( / ) and the port number.
port Specifies the port number.
distance_level Specifies the ISL mode to be set on the port (see Table 15 on
page 108).
vc_translation_link_
init
Is the extended link initialization sequence, which is an enhanced link
reset protocol that avoids excessive resetting of ports.
By default this option is set to 1 (enabled).
To prevent fabric segmentation, this option must be set to 0 (disabled)
when connecting to switches running Fabric OS versions earlier than
v3.0.2c or v4.0.2.
It must be set to 1 (enabled) in the following circumstances:
• When configuring a trunk over extended fabrics
• For optimal performance of ISLs between switches running Fabric OS
v3.0.2 or later, or Fabric OS v4.0.2 or later
desired_distance Required for a port configured for LD mode. Specifies the desired
distance, in kilometers, for the link. The specified value is the upper limit
for calculating buffer availability for the port. If the measured distance is
more than the specified desired_distance, the port is allocated the
number of buffers required by the specified desired distance. (Fabric OS
versions earlier than v4.4.0 do not support this parameter.)
switch:admin> portcfglongdistance 1/1 LD 1 50
switch:admin>