Reference Guide

TABLE 15 Total FC ports, ports per port group, and unreserved buffer credits per port group (continued)
Switch/blade
model
Total FC ports per
switch/blade
User port group
size
Unreserved buffer credits per
port group (with minimum
buffer allocation)
Unreserved buffer
credits per port group
(with QoS)
Unreserved buffer credits
per port group (without
QoS)
6558 48 48 7712 6464 6752
6559 48 48 7712 6464 6752
7840 24 24 5024 4400 4544
FC16-32 32 16 5408/2464 4992/2048 5088/2144
FC16-48 48 24 4960/2016 4336/1392 4480/1536
FC16-64 64 32 4288/1344 3456/512 3648/704
FX8-24 12 12 988 676 748
For the FC16-x port blades, the first number in the "Unreserved buffer credits per port group" column designates the number of
unreserved buffers per port group without buffer optimized mode; the second number designates the unreserved buffers with buffer
optimized mode enabled on the slot. Use the bufOpMode command to display or change the buffer optimized mode.
TABLE 16 Minimum buffers allocated per port type
Port type Minimum buffers allocated per port
32-Gbps Gen 6 / Condor 4 - F_Port 20
32-Gbps Gen 6 / Condor 4 - E_Port (non QoS) or F_Port trunk without QoS 70
32-Gbps Gen 6 / Condor 4 - E_Port with QoS, F_Port with AoQ, or F_Port trunk with QoS 105
16/10/8/4-Gbps Gen 6 / Condor 4 - F_Port 8
16/10/8/4-Gbps Gen 6 / Condor 4 - E_Port (non QoS), or F_Port trunk without QoS 28
16/10/8/4-Gbps Gen 6 / Condor 4 - E_Port with QoS, F_Port with AoQ, or F_Port trunk with QoS 34
16/10/8/4/2-Gbps Gen 5 / Condor 3 - F_Port 8
16/10/8/4/2-Gbps Gen 5 / Condor 3 - E_Port (non QoS), or F_Port trunk without QoS 28
16/10/8/4/2-Gbps Gen 5 / Condor 3 - E_Port with QoS, F_Port with AoQ, or F_Port trunk with
QoS
34
Maximum configurable distances for Extended Fabrics
The following table shows the maximum supported extended distances (in kilometers) that can be configured for one port on a specific
switch or blade at different speeds.
Formula for Gen-6 32-Gbps devices
The remaining buffers = (Total FE Ports * 20) + (Total BE/BI Ports * Buffers for BE/BI Port) + Internal buffer usages (approximately 152)
Long distance Calculation: Buffers = distance * speed * 0.5
Distance = (Buffers * 2) / speed
TABLE 17
Configurable distances for Extended Fabrics
Maximum distances (km) that can be configured (assuming a 2112-byte frame size)
Switch/blade model 4 Gbps 8 Gbps 10 Gbps 16 Gbps 32 Gbps
G620 6068 3034 2427 1517 758
FC32-48 4073 2036 1629 1018 509
SX6 2713 1356 1085 678 339
Buffer-to-Buffer Credits and Credit Recovery
Brocade Fabric OS Administration Guide, 8.0.1
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