Technical data

Fabric OS Administrator’s Guide 11-7
Publication Number: 53-0000518-09
Configuring an Extended ISL
11
Configuring an Extended ISL
Before configuring the ISL, ensure that the following conditions are met:
• Extended ISL support for SilkWorm 2000-series switches is limited as follows:
- Extended ISLs are not supported between SilkWorm 2000-series switches and other
SilkWorm models.
- To support extended ISLs between Silkworm 2000-series switches, the
fabric.ops.mode.longDistance parameter must be set to 1 on all switches in the fabric. Each
switch must be disabled before setting this parameter.
• For fabrics that contain a mix of SilkWorm models, the fabric.ops.mode.longDistance parameter
must be set to 0 (the default). Under certain circumstances (for example, if you want extended
distance between Bloom-based switches) this mode needs to be enabled (set to 1) on switches
running Fabric OS v3.x or v4.x. Talk to your switch provider for details.
• The ports on both ends of the ISL must have the same configuration.
• Use only qualified SFPs.
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 SilkWorm 2000-series extended ISLs, 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.
3. Enter the portCfgLongDistance command, using the following syntax:
portcfglongdistance [slotnumber/]portnumber [distance_level]
[vc_translation_link_init] [desired_distance]
slotnumber Specify the slot number for SilkWorm 12000, 24000, and 48000
directors. This option is not applicable to fixed-port switches. The slot
number must be followed by a slash ( / ) and the port number.
portnumber Specify the port number.
distance_level Specify the ISL mode to be set on the port (refer to Table 11-1 on
page 11-3).