Configuring An Extended Isl - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

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:
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, see
• 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. Issue the switchDisable command.
3. Issue the configure command to set the switch fabric-wide configurations. You can set the following
fabric-wide settings:
(* = multiplication symbol)
Field
Domain
R_A_TOV
E_D_TOV
WAN_TOV
MAX_HOPS
4. Issue the portCfgLongDistance command, using the following syntax:
portcfglongdistance [slotnumber/]portnumber [distance_level]
[vc_translation_link_init] [desired_distance]
where:
• slotnumber (for blades) is 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 is the port number
• distance_level is 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 configurations. 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.
• vc_translation_link_init enables the long-distance link initialization sequence. This extended link
initialization sequence is an enhanced link reset protocol, and avoids excessive resetting of ports.
By default, this option is set to 1 (enabled).
It must be set to 1 (enabled) when configuring a trunk over Extended Fabrics. It must be set to 1 for
a long-distance link not configured for ISL R_RDY mode; otherwise, it must be reset to 0.
A long-distance link also can be configured to be part of a trunk group. Two or more
"Administering ISL
Type
Number
Number
Number
Number
Number
trunking" on page 367.
Default Range
1 Varies
10000 E_D_TOV * 2 to 120000
2000 1000 to R_A_TOV/2
0 0 to R_A_TOV/4
7 7 to 19
Fabric OS 6.1.x administrator guide 365