Addendum

8. Create a QoS policy buffer and enter the QoS Policy Buffer Configuration mode to configure the no-
drop queues, ingress buffer size, buffer limit for pausing, and buffer offset limit for resuming.
CONFIGURATION mode
S4810-YU-MR-FTOS(conf)# qos-policy-buffer test
S4810-YU-MR-FTOS (conf-qos-policy-buffer)#queue 0 pause no-drop buffer-size
128000 pause-threshold 103360 resume-threshold 83520
S4810-YU-MR-FTOS (conf-qos-policy-buffer)# queue 4 pause no-drop buffer-size
128000 pause-threshold 103360 resume-threshold 83520
Applying a DCB Map in a Switch Stack
You must apply the same DCB map with PFC and ETS configuration to all stacked ports in a switch stack.
You cannot apply different DCB maps to different stacked switches. This functionality is supported on the
S6000 platform.
Entering the no dcb-map stack-unit all command removes all PFC and ETS settings applied to stacked
ports from the DCB map and resets PFC and ETS to their default settings.
Task Command Command Mode
Apply the specified DCB map on all
ports of the switch stack.
dcb-map stack-unit all stack-ports
all dcb-map-name
CONFIGURATION
dcb pfc-shared-buffer-size
Configure the maximum amount of shared buffer size for PFC packets in kilobytes. This utility is
supported on the S4810, S4820T, S6000, and MXL platforms.
You must configure the shared buffer size to be less than the total PFC buffer size. If the buffer size and
DCB buffer threshold settings are applied on one or more ports, a validaiton is performed to determine
whether following condition is satisfied: Shared-pfc-buffer-size <= (Total-pfc-buffer-size - Σpfc priority
<> buffer-size on each port, priority).
If the preceding condition is not satisfied by the shared PFC buffer size value, the configuration is not
saved and a system logging message is generated stating that the shared buffer size that you attempt to
specify cannot be configured because of the existing total buffer space on the system being lower than
the shared buffer size. You must either enter a smaller value for the shared buffer size or increase the
total buffer size appropriately by using the dcb pfc-total- buffer-size command.
S6000 S4810 S4820T MXL
Syntax
dcb pfc-shared—buffer—size KB
Parameters
KB Enter a number in the range of 0 to 7787.
Default The default is 1 KB for S6000 platforms.
Command
Modes
CONFIGURATION mode
Command
History
Version 9.3.0.0 Introduced on the S4810, S4820T, S6000, and MXL
platforms.
Data Center Bridging (DCB)
103