Configuring The Dynamic Buffer Method - Dell S4820T Configuration Manual

Configuring the Dynamic Buffer Method

Priority-based flow control using dynamic buffer spaces is supported on the S4820T platform.
To configure the dynamic buffer capability, perform the following steps:
1. Enable the DCB application. By default, DCB is enabled and link-level flow control is disabled on all
interfaces.
CONFIGURATION mode
dcb enable
2. Configure the shared PFC buffer size and the total buffer size. A maximum of 4 lossless queues are
supported.
CONFIGURATION mode
dcb pfc-shared-buffer-size 4000
dcb pfc-total-buffer-size 5000
NOTE: For dcb pfc-shared-buffer-size, the range is from <0-11210> in KB (default
LC=2496/SFM=3328)
For dcb pfc-total-buffer-size, the range is from <0-11210> in KB(default LC=7488/
SFM=7596)
3. Configure the number of PFC queues.
CONFIGURATION mode
dcb enable pfc-queues pfc-queues
The number of ports supported based on lossless queues configured will depend on the buffer. The
default number of PFC queues in the system is two for S4810 and Z9500, and one for S6000
platforms.
For each priority, you can specify the shared buffer threshold limit, the ingress buffer size, buffer limit
for pausing the acceptance of packets, and the buffer offset limit for resuming the acceptance of
received packets.
4. Configure the profile name for the DCB buffer threshold
CONFIGURATION mode
dcb-buffer-threshold dcb-buffer-threshold
5.
DCB-BUFFER-THRESHOLD mode
priority 0 buffer-size 52 pause-threshold 16 resume-offset 10 shared-
threshold-weight 7
6. Assign the DCB policy to the DCB buffer threshold profile on stack ports.
CONFIGURATION mode
Dell(conf)# dcb-policy buffer-threshold stack-unit all stack-ports all dcb-
policy-name
330
Data Center Bridging (DCB)