Administrator Guide

Version Description
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048–ON.
9.7(0.0) Introduced on the S6000-ON.
9.6(0.0) Introduced on the S5000.
9.3(0.0) Introduced on the S6000, S4810, and S4820T.
Usage Information
Congure the maximum buer available for PFC trac. You can choose to increase or decrease the buer size that is allocated in the system by
default. However, if you modify the PFC buer size lower than the previously congured size, the system determines whether this reduction in
size is valid without disrupting the existing conguration. In such a scenario, disable and re-enable DCB.
The lossless queue limit per port is validated based on the dcb pfc-queues command. PFC queue conguration identies the maximum
number of queues a port can support. Although the queue limit per port is a baseline when dynamic buering is enabled, the limit per port for
queues depends on the availability of the buer.
Example
Dell(conf)#dcb pfc-total-buffer-size 2800
Dell(conf)#
Also, show dcb showing the total buffer can be added.
Dell#show dcb
DCB Status: Enabled, PFC Queue Count: 2
Total Buffer: Total available buffer excluding the buffer pre-allocated
for guaranteed services like global headroom, queue's min
guaranteed buffer and CPU queues.
PFC Total Buffer: Maximum buffer available for lossless queues.
PFC Shared Buffer: Buffer used by ingress priority groups for shared usage.
PFC Headroom Buffer: Buffer used by ingress priority group for shared headroom usage.
PFC Available Buffer: Current buffer available for new lossless queues to be
Provisioned.
stack-unit Total Buffer PFC Total Buffer PFC Shared Buffer PFC Headroom Buffer PFC Available Buffer
PP (KB) (KB) (KB) (KB) (KB)
-----------------------------------------------------------------------------------------------------
1 0.0 3399 2800 1040 1040 711
1 0.1 3399 2800 1040 1040 720
1 0.2 3399 2800 1040 1040 711
1 0.3 3399 2800 1040 1040 720
Dell#
Dell(conf)#dcb pfc-total-buffer-size 2000
% Error: Total buffer size should not be less than the buffer consumed already in the system
Dell(conf)#
show running-cong dcb-buer-threshold
Displays the DCB buer threshold details in the running conguration.
Syntax
show running—config dcb-buffer-threshold
Command Modes
EXEC
516 Data Center Bridging (DCB)