368 | Quality of Service (QoS) Commands
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Mode
Global Config
Usage
After you change the buffers, you should execute this command before rebooting the switch to verify 
that the buffer allocations meet the hardware requirements.
Command
History
Related
Commands
buffer dedicated (1G and stacking ports)
This command sets buffer sizes per port and per queue for the ASICs controlling ports 1– 48 and the 
stack port on the S50, and ports 1 – 52 and the stack port on the S50V.
Syntax
[no] buffer dedicated {interface unit/slot/port | system-uplink unit} Queue-0_buffer 
Queue-1_buffer Queue-2_buffer Queue-3_buffer Queue-4_buffer Queue-5_buffer 
Queue-6_buffer
To return buffers to their default values, use the no buffer dedicated interface unit/slot/port or no 
buffer dedicated system-uplink unit command syntax, depending on the target port.
Parameters
 
Version 2.5.1 Introduced
buffer dedicated (1G and 
stacking ports)
Set buffer sizes per port and per queue for ports 1 – 48 and the stack port on 
the S50, and ports 1 – 52 and the stack port on the S50V.
buffer dedicated interface 
(10G ports)
Set buffer sizes per port and per queue for the optional 10Gb ports 49 and 50 
on the S50 and the 10Gb ports on the S25P.
buffer dynamic (1G and stack 
ports)
Set dynamic buffer sizes per port for ports 1 – 48 and the stack port on the 
S50, and ports 1 – 52 and the stack port on the S50V
show buffer unit Display configured and actual static buffer allocation and packet allocation 
values per queue for the 
selected port in an S50, S50V, or S25P.
interface unit/slot/port Enter the keyword interface followed by the port that you want to 
configure.
The possible ports vary by platform:
• S50: The 1Gb ports (1 – 48) (Use buffer dedicated interface (10G 
ports) for ports 49 and 50.)
• S50V: 1 – 52
system-uplink unit Enter the keyword system-uplink followed by the stack member 
number containing the stack port that you want to configure. 
Note: There is no system-uplink in the S25P. 
Queue-0_buffer, 
Queue-1_buffer...
...Queue-6_buffer 
For each of the seven queues, in sequence, enter a number indicating its 
desired buffer size, in 1KB increments (for example, 100 for 100KB). 
Each queue can be assigned from 0KB to any portion of the remaining total 
memory. Queue 7 is unavailable for buffer carving, inheriting any of the 
total buffer size not allocated.
The total buffer size varies by platform:
• S50: 988KB 
• S50V: 2013KB
Memory measurement is the total combined dedicated and dynamic memory 
per 12-port group.