Brocade Communications Systems StoreFabric SN6500B Administrator's Manual page 180

13
Extended link buffer allocation overview
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Buffer Needed—The number of buffers needed. You can edit the buffer needed for LD and LS
modes. When you change Buffer Needed value, Frame Size and Desired Distance(km) value
cannot be changed.
Buffer Allocated—The number of buffers actually allocated.
Frame Size—The size of the frame. When you edit the frame size value, the desired distance
value can also be changed for LD and LS modes and vice versa. But the buffer value cannot be
changed.
VC Link Init—The fill words used on long distance links. When set to IDLE (0) mode, the link
uses IDLE fill words. When set to ARB (1) mode, the link uses the default ARB fill words.
Fill Word—Fill word comprises of the following modes:
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Mode 0: Use IDLE in link init and IDLE as Fill word
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Mode 1: Use ARB in link init and ARB as Fill word
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Mode 2: Use IDLE in link init and ARB as Fill word
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Mode 3: Try Mode 1 first; if it fails then try Mode 2.
NOTE
Fill word is not supported in 16 Gbps capable FC platforms.
You must configure Fill Word and then configure Long Distance and VC Link Init. Make sure Fill
Word is always equal to or greater than the VC Link Init value.
Link Distance(km)—The actual distance of the link.
Desired Distance (km)—Required for a port configured in LD or LS mode
page 153), the desired distance, in kilometers, for the link.
For an LD-mode link, the desired distance is used as the upper limit of the link distance to
calculate buffer availability for other ports in the same port group. If the measured distance is
more than the desired distance, the desired distance is used to allocate the buffers. In this
case, the port operates in degraded mode instead being disabled due to insufficient buffers.
For an LS-mode link, the actual distance is not measured; instead the desired distance is used
to calculate the buffers required for the port.
Long Distance—Table 15
require a Brocade Extended Fabrics license.
describes the long-distance settings and identifies which settings
(Table 15 on
Web Tools Administrator's Guide
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