Reference Guide
Table 38. Maximum buer size
Platforms Max buer size
S4000 12 MB
S6010–ON, S4048–ON 16 MB
S41xx 12 MB
Z9100–ON 16 MB
Default settings for Link-level ow control (LLFC)
The following table lists the LLFC buer settings for the default priority group 7.
Table 39. Default setting for LLFC
Speed 10G 25G 40G 50G 100G
Default reserved buer 45KB 45KB 111KB 111KB 111KB
Default Xo threshold 36KB 36KB 75KB 75KB 75KB
Default Xon threshold 9KB 9KB 36KB 36KB 36KB
Default settings for Priority ow control (PFC)
The following table lists the PFC buer settings per PFC priority group.
Table 40. Default settings for PFC
Speed 10G 25G 40G 50G 100G
Default reserved buer for S4000, S4048–ON, S6010–ON 9KB NA 9KB NA NA
Default reserved buer for S41xx, Z9100–ON 9KB 9KB 18KB 18KB 36KB
Default Xo threshold 36KB 45KB 75KB 91KB 142KB
Default Xon threshold 9KB 9KB 9KB 9KB 9KB
Default dynamic share buer threshold(alpha value) 9KB 9KB 9KB 9KB 9KB
NOTE: The supported speed varies for dierent platforms. After the reserved buers are utilized, each PFC starts consuming
shared buers from the lossless pool with the threshold determined by the alpha value.
Congure priority group buer settings
You can override the default priority group settings when LLFC or PFC is enabled.
1 Create network-qos type class-map to match the trac classes. For LLFC match all the trac classes(0-7) and for PFC, match the
required trac class.
OS10(config)# class-map type network-qos tc
OS10 (config-cmap-nqos)# match qos-group 0-7
2 Create network-qos type policy-map to dene the actions for trac classes, like buer conguration and thresholds.
OS10(config)# policy-map type network-qos buffer
OS10(config-pmap-network-qos)# class tc
OS10 (config-pmap-c-nqos)# pause buffer-size 300 pause-threshold 200 resume-threshold 100
OS10 (config-pmap-c-nqos)# queue-limit thresh-mode dynamic 5
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