.Part 4 SAN Extension and Bridging HP SAN Design Reference Guide 785354-001

Table 133 (page 265) describes the appropriate port protocol setting based on the WDM system
architecture.
Table 133 Port protocol setting based on the extension architecture
B-series port protocol settingWDM system architecture
portCfgISLMode slot/port, 1Active protocol handling (Table 132 (page 262))
portCfgISLMode slot/port, 0Passive protocol handling
NOTE: The portCfgISLMode and portCfgLongDistance L0.5, L1, or L2 mode cannot be
enabled at the same time; otherwise, fabric segmentation occurs.
The portCfgISLMode and portCfgLongDistance mode LE, LD, or LS can be enabled at the
same time.
B-series trunking and WDM
Consider the following when using B-series trunking with WDM:
• Trunking with WDM is supported only at 2 Gb/s or 4 Gb/s (1 Gb/s is not supported).
• Trunking de-skew timers can accommodate a maximum difference of 400 m (de-skew value
of 200) between the shortest and longest ISLs in a trunk.
• Trunking distance rules are listed in the HP StorageWorks Fabric OS Administrator Guide.
• Trunking is not supported with ports configured for portCfgMode slot/port, 1 (R_RDY mode).
C-series switch settings
Table 134 (page 265) lists the C-series switch extended fabric settings for maintaining performance
with extended fabric links.
Table 134 C-series switch extended fabric settings
SettingExtended fabric item
C-series switches support up to 4095 BB_credits. For more information, see “C-series
switches that support iSCSI” (page 358).
Supported switch models
7Maximum number of hops
For more information about distance rules for long-wave transceivers, see Table 68 (page
158), Table 69 (page 159), and Table 70 (page 159) in “SAN fabric connectivity and
switch interoperability rules” (page 152).
Maximum segment distance
Consider the following when using C-series switches with extended fabric links:
• The MDS 9216i and 14/2 Multiprotocol Services Modules can allocate up to 3,500 BB_credits
to an individual port.
• The MDS 9222i Multiservice Fabric and 18/4 Multiservice Modules can allocate up to 4,095
BB_credits to an individual port.
• 4 Gb/s and 10 Gb/s Fibre Channel Switching Modules can allocate up to 4,095 BB_credits
to an individual port.
• Each port on the 16-port line card supports 255 BB_credits. These credits are available on a
per-port basis through a single link or a link combined with a port channel.
• Using a port channel, bundles up to sixteen 2 Gb/s links to form a single 32 Gb/s link.
• Using a port channel, bundles up to sixteen 4 Gb/s links to form a single 64 Gb/s link.
• Using a port channel, bundles up to sixteen 10 Gb/s links to form a single 160 Gb/s link.
• All port channel links must be the same speed.
Fibre Channel long-distance technology 265