Reference Guide

49 - 20 - ( - ) - ( - ) 0 - -
50 - 20 - ( - ) - ( - ) 0 - -
51 - 20 - ( - ) - ( - ) 0 - -
52 - 20 - ( - ) - ( - ) 0 - -
53 - 20 - ( - ) - ( - ) 0 - -
54 - 20 - ( - ) - ( - ) 0 - -
55 - 20 - ( - ) - ( - ) 0 - -
56 E - 20 - ( - ) - ( - ) 70 70 <2km
57 E - 20 - ( - ) - ( - ) 70 70 <2km
58 E - 20 - ( - ) - ( - ) 70 70 <2km
59 E - 20 - ( - ) - ( - ) 70 70 <2km
60 E - 20 - ( - ) - ( - ) 70 70 <2km
61 E - 20 - ( - ) - ( - ) 70 70 <2km
62 E - 20 - ( - ) - ( - ) 105 105 <2km
63 E - 20 - ( - ) - ( - ) 105 105 <2km 11522
Buffer credits per switch or blade model
The following table shows the total FC ports in a switch or blade, the number of user ports in a port group, and the unreserved buffer
credits available per port group.
Formula for Gen-6 32-Gbps devices
Remaining buffers = Total Buffers - [(Total FE Ports * 20) + (Total BE/BI Ports * Buffers for BE/BI Port) +Internal buffer usages
(approximately 152).
TABLE 14 Total FC ports, ports per port group, and unreserved buffer credits per port group
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)
G620 64 64 13928 8488 10728
FC32-48 48 24 8152 6112 6952
SX6 16 16 5432 4072 4632
Formula for Gen-5 16-Gbps and older devices
Remaining buffers = Total Buffers - [(Total FE Ports * 8) + (Total BE/BI Ports * Buffers for BE/BI Port) + EMB Buffers + SAB Buffers.
TABLE 15 Total FC ports, ports per port group, and unreserved buffer credits per port group
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)
6505 24 24 7904 7280 7424
M6505 24 24 7904 7280 7424
6510 48 48 7712 6464 6752
6520 96 24 4784 4160 4304
6542 48 48 7712 6464 6752
6543 24 24 7904 7280 7424
6545 26 26 7888 7212 7368
6546 24 24 7904 7280 7424
6547 48 48 7712 6464 6752
6548 28 28 7872 7144 7312
6549 28 28 7904 7280 7424
Buffer-to-Buffer Credits and Credit Recovery
Brocade Fabric OS Administration Guide, 8.0.1
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