Reference Guide

Platforms Max buer size
S4000 12 Mb
S6010–ON, S4048–ON 16 Mb
S41xx 12 Mb
Z9100–ON 16 Mb
Link-level ow control (LLFC) default settings
The following table lists the LLFC buer settings for the default priority group 7.
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
Priority ow control (PFC) default settings
The following table lists the PFC buer settings per PFC priority group.
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
Congure egress buer
Default settings
All port queues are allocated with reserved buers and when the reserved buers are consumed, each queue starts using the shared buer
from the default pool.
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Quality of service