Long Distance Link Initialization Activation; Extended Fabrics Device Limitations; Configuring An Extended Isl - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

Long distance link initialization activation

VC translation link initialization (vc_translation_link_init), a parameter of the
portCfgLongDistance command, is enabled by default for long-distance links. To avoid inconsistency
in the fabric, make sure that this parameter is enabled on both ends of the link by entering the
portCfgLongDistance --vc_translation_link_init command. Specify 1 to activate long
distance link initialization sequence; specify 0 to deactivate this mode. When the command is run without
specifying a value, 1 is assigned automatically for the long-distance link in VC_RDY flow control;
otherwise, 0 is assigned. For a long-distance link not configured for ISL R_RDY mode, this parameter must
be set to 1; otherwise, it must be reset to 0.

Extended fabrics device limitations

Extended Fabrics is normally not implemented on the following devices.
• The
400 Multi-protocol (MP) Router
FC ports. The two Gigabit Ethernet ports provide SAN extension over IP networks using FCIP.
• The FC4- 1 6IP blade integrates eight Gigabit Ethernet ports and eight FC ports. It is used to implement
the iSCSI Gateway Service. The Gigabit Ethernet ports are used to connect iSCSI initiators, and the FC
ports are used to connect to any device.

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.
• Use only qualified Brocade SFPs.
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, refer to
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)
Field
Domain
R_A_TOV
E_D_TOV
WAN_TOV
MAX_HOPS
and the FR4- 1 8i blade integrate two Gigabit Ethernet ports and sixteen
A long-distance link also can be configured to be part of a trunk group. Two or more
Type
Number
Number
Number
Number
Number
"Administering ISL Trunking" on page 377.
Default Range
1 Varies
1000 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.x administrator guide 369