Configuration Guide User guide

FastIron Configuration Guide 591
53-1002494-02
Dynamic buffer allocation for FCX, FWS, and ICX devices
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 for buffer profile with qd-descriptor and qd-buffer commands on FCX, FWS,
and ICX
The descriptor and buffer allocation process occurs in four sequential steps using the qd-buffer
and qd-descriptor commands.
NOTE
For FCX devices, when you reset buffer values for the 10 Gbps ports, the buffer values for the
rear-panel 10 Gbps and16 Gbps ports are also reset.
1. Configure the allowable port descriptors. Port descriptors set the limit for the ports. The
minimum limit for the port descriptors is 16. The maximum limit of the port descriptors
depends on the hardware device. Port descriptor limits of different platforms are listed in the
section “Buffer and descriptor maximum and default allocation values” on page 596.
Configure the allowable port descriptors by entering a command similar to the following.
Brocade# qd-descriptor 1 2 76
Syntax: [no] qd-descriptor <devicenum> <porttypeval> <numdescriptors>
The <devicenum> variable refers to the device in the stacking unit. The device number starts
from 0.
The <porttypeval> variable is 1 for 1 Gbps ports and 2 for 10 Gbps ports.
The <numdescriptors> variable refers to the number of descriptors to allocate.
2. Configure the queue descriptors. The minimum limit for queue descriptors is 16. The system
default queue descriptors for different platforms are listed in “Buffer and descriptor maximum
and default allocation values” on page 596. Configure the queue descriptors for the queue by
entering a command similar to the following.
Brocade# qd-descriptor 1 2 76 2
Syntax: [no] qd-descriptor <devicenum> <porttypeval> <numdescriptors> <priorityqueue>
The <devicenum> variable refers to the device in the stacking unit. The device number starts
from 0.
The <porttypeval> variable is 1 for 1 Gbps ports and 2 for 10 Gbps ports.
The <numdescriptors> variable refers to the number of descriptors to allocate.