Fabric OS Administrator’s Guide 453
53-1002446-01
Configuring an extended ISL
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• Static Long-Distance Mode (LS) - LS calculates a static number of BB credits based only on a
user-defined desired_distance value. LS mode also assumes that all FC payloads are 2112
bytes. Specify LS mode to configure a static long distance link with a fixed buffer allocation
greater than 10 km. Up to a total of 1452 full-size frame buffers are reserved for data traffic,
depending on the specified desired_distance value.
Configuring an extended ISL
Before configuring an extended ISL, ensure that the following conditions are met:
• 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.
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 Chapter 22, “Managing Trunking Connections”.
• Only qualified Brocade SFPs are used. Only Brocade-branded or certain Brocade-qualified
SFPs are supported.
1. Connect to the switch and log in using an account assigned to the admin role.
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. For 8 Gbps platforms only, enter the portCfgFillword command to set ARB as the fill word.
portcfgfillword [slot/]port, mode
The mode parameter in this command should be set to 3 if the vc_translation_link_init
parameter in the portCfgLongDistance command (in the next step) is set to 1.
5. Enter the portCfgLongDistance command.
portcfglongdistance [slot/]port [distance_level] [vc_translation_link_init]
[desired_distance]
6. Repeat step 5 and step 4 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.
Field Type Default Range
Domain Number 1 Varies
R_A_TOV Number 10000 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
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