Users Guide

● Detecting microburst congestions
● Monitoring buffer utilization and historical trends
● Determining optimal sizes and thresholds for the ingress or egress shared buffers and headroom on a given port or queue
based on real-time data
NOTE: BST is not supported on the S4248F-ON platforms.
After you disable BST, be sure to clear the counter using the clear qos statistics type buffer-statistics-
tracking command.
Port to port-pipe and MMU mapping
A port pipe handles network traffic to and from a set of front-end I/O ports. On the Z9100–ON, Z9264F–ON, and MX9116n
platforms, interfaces are shared across port pipes and port pipes are shared across Memory Management Units (MMUs).
As interfaces span across port pipes, Dell EMC Networking recommends spreading ingress and egress interfaces across
different port pipes for optimal performance. To find the port to port-pipe and MMU mapping, use the show qos port-map
details command.
Z9100–ON output example:
OS10# show qos port-map details
---------------------------------------------------------------------------
Interface Port Pipe Ingress MMU Egress MMU Oper Status
---------------------------------------------------------------------------
Eth 1/1/1 1 2, 3 0, 2 up
Eth 1/1/2 1 2, 3 0, 2 up
Eth 1/1/3 1 2, 3 0, 2 up
Eth 1/1/4 1 2, 3 0, 2 up
Eth 1/1/5 2 2, 3 1, 3 up
Eth 1/1/6 2 2, 3 1, 3 up
Eth 1/1/7 2 2, 3 1, 3 up
Eth 1/1/8 2 2, 3 1, 3 up
Eth 1/1/9 1 2, 3 0, 2 up
Eth 1/1/10 1 2, 3 0, 2 up
Eth 1/1/11 1 2, 3 0, 2 up
Eth 1/1/12 1 2, 3 0, 2 up
Eth 1/1/13 2 2, 3 1, 3 down
Eth 1/1/14 2 2, 3 1, 3 down
Eth 1/1/15 2 2, 3 1, 3 down
Eth 1/1/16 2 2, 3 1, 3 down
Eth 1/1/17 3 0, 1 1, 3 down
Eth 1/1/18 3 0, 1 1, 3 down
Eth 1/1/19 3 0, 1 1, 3 down
Eth 1/1/20 3 0, 1 1, 3 down
Eth 1/1/21 0 0, 1 0, 2 down
Quality of service
1569