HP StorageWorks Fabric OS 6.1.x administrator guide (5697-0234, November 2009)

354 Administering Extended Fabrics
Configuring an extended ISL
Before configuring an extended ISL, ensure that the following conditions are met:
• Be sure that the ports on both ends of the ISL are operating at the same port speed, and can be
configured at the same distance level without compromising local switch performance.
NOTE: A long-distance link also can be configured to be part of a trunk group. Two or more
long-distance links in a port group form a trunk group when they are configured for the same speed,
the same distance level, and their link distances are nearly equal. For information on trunking
concepts and configurations, refer to ”Administering ISL Trunking” on page 377.
• Use only qualified HP branded SFPs.
• For fabrics that contain B-Series 2Gb switches, contact HP support for details on which
parameters to set.
• For Fabric OS 3.x or 4.x, contact HP for details on which parameters to set.
1. Connect to the switch and log in as admin.
2. Enter the switchDisable command.
3. Enter the configure command to set the switch fabric-wide configurations. You can set the following
fabric-wide settings:
(* = multiplication symbol)
4. Enter the portCfgLongDistance command, using the following syntax:
portcfglongdistance [slotnumber/]portnumber [distance_level]
[vc_translation_link_init] [desired_distance]
Field Type Default Range
Domain Number 1 Varies
R_A_TOV Number 1000 E_D_TOV * 2 to 120000
E_D_TOV Number 2000 1000 to R_A_TOV/2
WAN_TOV Number 0 0 to R_A_TOV/4
MAX_HOPS Number 7 7 to 19
slotnumber For blades, the slot number in which the blade is located. The slot
number must be followed by a slash (/) and the port number. This
option is not used for fixed-port switches.
portnumber The port number.
distance_level One of the following (the numerical value representing each
distance_level is shown in parentheses):
L0 (0) Specify L0 to configure the port to be a regular switch port.
LE (3) Specify LE mode for distances up to 10 Km.
LD (5) Specify LD for automatic long-distance configuration. The
buffer credits for the given E_Port are automatically configured,
based on the actual link distance measured during E_Port
initialization.
LS (6) Specify LS mode to configure a long-distance link with a
buffer allocation based on a fixed desired distance value.