Users Guide

Table 88. Maximum buffer size
Platforms Max buffer size
S4000 12 MB
S6010–ON, S4048–ON 16 MB
S4100-ON Series 12 MB
S4200-ON Series 6 GB
S5200-ON Series 32 MB
Z9100–ON 16 MB
Z9264F-ON 42 MB
The following table lists the values allocated for the default ingress buffers on the S4100-ON series platform. These values may differ for
different platforms and speeds. Use the show qos ingress buffers command to view the default ingress buffers on your switch.
Table 89. Default ingress buffers on the S4100-ON series platform
Speed 10G 25G 40G 50G 100G
Reserved buffers for
PG 7 (default)
9KB 9KB 9KB 9KB 9KB
The following lists the link-level flow control (LLFC) buffer settings for default priority group 7:
Table 90. Default setting for LLFC
Speed 10G 25G 40G 50G 100G
Default reserved buffer 9KB 9KB 18KB 18KB 36KB
Default Xon threshold 36KB 45KB 75KB 91KB 142KB
Default Xoff threshold 9KB 9KB 9KB 9KB 9KB
Default dynamic shared buffer threshold (alpha
value)
9KB 9KB 9KB 9KB 9KB
NOTE: The supported speed varies for different platforms. After the reserved buffers are used, each LLFC starts
consuming shared buffers from the lossless pool with the alpha value determining the threshold except for the S4200-
ON series platform.
The following table lists the priority flow control (PFC) buffer settings per PFC priority group:
Table 91. Default settings for PFC
Speed 10G 25G 40G 50G 100G
Default reserved buffer for S4000, S4048–ON, S6010–ON 9KB NA 9KB NA NA
Default reserved buffer for S41xx, Z9100–ON 9KB 9KB 18KB 18KB 36KB
Default Xoff threshold 36KB 45KB 75KB 91KB 142KB
Default Xon threshold 9KB 9KB 9KB 9KB 9KB
Default dynamic share buffer threshold (alpha value) 9KB 9KB 9KB 9KB 9KB
NOTE: The supported speed varies for different platforms. After the reserved buffers are used, each PFC starts
consuming shared buffers from the lossless pool with the alpha value determining the threshold.
You can override the default priority group settings when you enable LLFC or PFC.
1. Create a network-qos type class-map to match the traffic classes. For LLFC, match all the traffic classes from 0 to 7. For PFC, match
the required traffic class.
OS10(config)# class-map type network-qos example-cmap-in-buffer
OS10 (config-cmap-nqos)# match qos-group 0-7
1108
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