Reference Guide

Table 38. Maximum buer size
Platforms Max buer 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 buer settings for the default priority group 7.
Table 39. Default setting for LLFC
Speed 10G 25G 40G 50G 100G
Default reserved buer 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 buer settings per PFC priority group.
Table 40. Default settings for PFC
Speed 10G 25G 40G 50G 100G
Default reserved buer for S4000, S4048–ON, S6010–ON 9KB NA 9KB NA NA
Default reserved buer 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 buer threshold(alpha value) 9KB 9KB 9KB 9KB 9KB
NOTE: The supported speed varies for dierent platforms. After the reserved buers are utilized, each PFC starts consuming
shared buers from the lossless pool with the threshold determined by the alpha value.
Congure priority group buer 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 trac classes. For LLFC match all the trac classes(0-7) and for PFC, match the
required trac 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 dene the actions for trac classes, like buer conguration 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
678
Quality of service