Users Guide

Table 144. Default egress buffers on the S4100-ON series platform
Speed 10G 25G 40G 50G 100G
Reserved buffers
for each queue of a
port (default)
1664 bytes 1664 bytes 1664 bytes 1664 bytes 1664 bytes
The default dynamic shared buffer threshold is 8.
1. Create a queuing type class-map to match the queue.
OS10(config)# class-map type queuing example-cmap-eg-buffer
OS10(config-cmap-queuing)# match queue 1
2. Create a queuing type policy-map to define the actions for queues, such as a buffer configuration and threshold.
OS10(config)# policy-map type queuing example-pmap-eg-buffer
OS10(config-pmap-queuing)# class example-cmap-eg-buffer
OS10(config-pmap-c-que)# queue-limit queue-len 200 thresh-mode dynamic 5
Deep Buffer mode
NOTE: This feature is supported only on the S4200-ON series.
OS10 provides the flexibility to configure the buffer mode based on your system requirements.
The S4200-ON series switch comes with a default deep buffer size of 4.63 GB. You can use the hardware deep-buffer-
mode command to enhance the deep buffer size to 6.24 GB. For information about how to configure deep buffer mode, see
Configure Deep Buffer mode. The following lists the total buffer availability in the different modes:
Table 145. Buffer availability in different modes
Platform Default deep buffer Enhanced deep buffer
S4200–ON series 4.63 GB 6.24 GB
Deep Buffer mode takes effect only after saving it in the startup configuration and reloading the switch.
NOTE: Disabling the Deep Buffer mode configuration during runtime is not supported.
Configuration notes
1. When the switch is in Deep Buffer mode, the PFC and LLFC features are not available. The following commands are not
supported:
● priority-flow-control mode on—Configure Priority Flow Control mode on an interface.
● service-policy input type network-qos policy-name—Apply a network service policy on an interface.
● flowcontrol transmit on—Configure flow control transmit.
● pfc-max-buffer-size size—Configure maximum buffer size for PFC.
● pfc-shared-buffer-size size—Configure shared buffer size for PFC.
NOTE:
To view the PFC, LLFC, or service policy configured on the interfaces, use show running-configuration
command. Use interface range command to disable network QoS-related configurations before enabling Deep Buffer
mode.
2. The other QoS features such as traffic classification, policing, marking, shaping, priority queuing, and scheduling are
supported in Deep Buffer mode.
Quality of service
1551