HP AA979A - StorageWorks SAN Switch 2/8V Administrator's Manual page 331

To configure an extended ISL
1. Connect to the switch and log in as admin.
If the fabric contains HP StorageWorks 1 GB extended ISLs, use the switchDisable command to
2.
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.
3. Enter the portCfgLongDistance command, using the following syntax:
portcfglongdistance [
desired_distance
[ ]
slotnumber
portnumber
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 will reconfigure.
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:
switch:admin> portcfglongdistance 1/1 LD 1 50
slotnumber portnumber
/]
Specify the slot number for SAN Director 2/128 and 4/256 SAN
Director. This option is not applicable to fixed-port switches. The
slot number must be followed by a slash ( / ) and the port number.
Specify the port number.
Specify the ISL mode to be set on the port (refer to
This extended link initialization sequence, which is an enhanced
link reset protocol, 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) when configuring a trunk over
extended fabrics.
Required for a port configured for LD mode. Specify 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.)
Note: For 4/256 SAN Director with FC4- 1 6 or FC4-32 port
blades, ports will be shown as buffer limited.
distance_level vc_translation_link_init
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Fabric OS 5.2.x administrator guide 331
]
Table 67).