Connectivity Guide

Buer-usage accounting happens for ingress packets on ingress pools and egress packets on egress pool. You can congure ingress-packet
buer accounting per priority-group and egress-packet buer accounting per queue level.
Congure ingress buer
In default ingress buers, all trac classes map to the default priority group. The buers are reserved per default priority group ID 7. All
buers are part of the default pool and all ports share buers from the default pool.
The reserved buer size is 9360 bytes for the speed of 10G, 25G, 40G, 50G, and 100G. The supported speed varies for dierent platforms.
Table 64. Maximum buer size
Platforms Max buer size
S4000 12 MB
S6010–ON, S4048–ON 16 MB
S4100-ON Series 12 MB
S4200-ON Series 3 GB
S5148F-ON 16 MB
S5200-ON Series 32 MB
Z9100–ON 16 MB
Z9264F-ON 42 MB
The following lists the link-level ow control (LLFC) buer settings for default priority group 7:
Table 65. Default setting for LLFC
Speed 10G 25G 40G 50G 100G
Default reserved buer 9KB 9KB 18KB 18KB 36KB
Default Xon threshold 36KB 45KB 75KB 91KB 142KB
Default Xo threshold 9KB 9KB 9KB 9KB 9KB
Default dynamic shared 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 used, each LLFC starts consuming
shared buers from the lossless pool with the alpha value determining the threshold except for the S4200-ON series and
S5148F-ON platform.
The following table lists the priority ow control (PFC) buer settings per PFC priority group:
Table 66. 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
Quality of service 979