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PowerConnect B-Series FCX Configuration Guide 327
53-1002266-01
TDynamic Buffer Allocation for an IronStack
9
For example, for an 8-unit stack of 48 ports, the packet processor numbering scheme is as follows:.
Stack unit 1 - packet processors 0 and 1
Stack unit 2 - packet processors 2 and 3
Stack unit 3 - packet processors 4 and 5
Stack unit 4 - packet processors 6 and 7
Stack unit 5 - packet processors 8 and 9
Stack unit 6 - packet processors 10 and 11
Stack unit 7 - packet processors 12 and 13
Stack unit 8 - packet processors 14 and 15
In this configuration, if stack unit 3 and stack unit 7 are 24-port devices, the odd-numbered packet
processors 5 and 13 cannot be configured, and do not exist, although they are reserved.
Configuration Steps
The buffer and descriptor allocation process occurs in four sequential steps using the qd-descriptor
command.
PowerConnect# qd-descriptor
Syntax: qd-descriptor <stack-unit> <x> <y>
NOTE
For PowerConnect B-Series FCX devices, when you reset buffer values for the 10 Gpbs ports, the
buffer values for the rear-panel 10 Gbps/16 Gbps ports are also reset.
1. Configure the allowable port descriptors by entering a command similar to the following:
PowerConnect#qd-descriptor 1 2 -
Syntax: qd-descriptor <DeviceNum> <PortTypeVal> <NumDescriptors>
"DeviceNum: 1-x
"PortTypeVal : 1 for 1Gbps, 2 for 10Gbps
"NumDescriptors : Number of descriptors to allocate (minimum 1, maximum 4095
2. Configure the port descriptors for the queue by entering a command similar to the following:
PowerConnect#qd-descriptor 1 2 76 2
Syntax: qd-descriptor <DeviceNum> <PortTypeVal> <NumDescriptors>
<PriorityQueue>
"DeviceNum: 1-x
"PortTypeVal : 1 for 1Gbps, 2 for 10Gbps
"NumDescriptors : Number of descriptors to allocate (minimum 1, maximum 4095)
"PriorityQueue: Designates a specific queue (0 to 7)
3.Configure the allowable packet buffers by entering a command similar to the
following:
PowerConnect#qd-buffer 1 2 76
Syntax: qd-buffer <DeviceNum> <PortTypeVal> <NumBuffers>
"DeviceNum: 1-x
"PortTypeVal : 1 for 1Gbps, 2 for 10Gbps
"NumDescriptors : Number of descriptors to allocate (minimum 1, maximum 4095)
3. Configure the allowable packet buffers for the queue by entering a command similar to the
following: