Administrator Guide

% Error: PFC buffer-threshold policies conflict with dot1p mappings. Please remove all dcb-
buffer-threshold policies to change mappings.
The show dcb command has been enhanced to display the following additional buer-related information:
Dell(conf)#do show dcb
dcb Status : Enabled
PFC Queue Count : 2 --Indicate the PFC queue configured.
Total buffer (lossy + lossless)(in KB): 7787--Total buffer space for lossy and lossless
queues
PFC total buffer (in KB): 6526 --Indicates the total buffer (configured or default)
PFC shared buffer (in KB): 832--Indicates the shared buffer (Configured or default)
PFC available buffer ( in KB): 5694--Indicates remaining available buffers for PFC that
are free to be allocated
Conguring the Dynamic Buer Method
To congure the dynamic buer capability, perform the following steps:
1. Enable the DCB application. By default, DCB is enabled and link-level ow control is disabled on all interfaces.
CONFIGURATION mode
S6000-109-Dell(conf)#dcb enable
2. Congure the shared PFC buer size and the total buer size. A maximum of 4 lossless queues are supported.
CONFIGURATION mode
S6000-109-Dell(conf)#dcb pfc-shared-buffer-size 4000
S6000-109-Dell(conf)#dcb pfc-total-buffer-size 5000
3. Congure the number of PFC queues.
CONFIGURATION mode
Dell(conf)#dcb enable pfc-queues 4
The number of ports supported based on lossless queues congured will depend on the buer.
For each priority, you can specify the shared buer threshold limit, the ingress buer size, buer limit for pausing the
acceptance of packets, and the buer oset limit for resuming the acceptance of received packets.
4. Congure the prole name for the DCB buer threshold
CONFIGURATION mode
Dell(conf)#dcb-buffer-threshold test
5.
DCB-BUFFER-THRESHOLD mode
Dell(conf-dcb-buffer-thr)# priority 0 buffer-size 52 pause-threshold 16 resume-offset 10
shared-threshold-weight 7
6. Assign the DCB policy to the DCB buer threshold prole on stack ports.
CONFIGURATION mode
Dell(conf)# dcb-policy buffer-threshold stack-unit all stack-ports all test
7. Assign the DCB policy to the DCB buer threshold prole on interfaces. This setting takes precedence over the default buer-
threshold setting.
INTERFACE mode (conf-if-te)
Dell(conf-if-te-0/0)#dcb-policy buffer-threshold test
8. Create a QoS policy buer and enter the QoS Policy Buer Conguration mode to congure the no-drop queues, ingress buer
size, buer limit for pausing, and buer oset limit for resuming.
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Data Center Bridging (DCB)