Users Guide

Buer Tuning
Buer Tuning allows you to modify the way your switch allocates buers from its available memory and helps prevent packet drops during a
temporary burst of trac.
Using a PreDened Buer Prole
Dell EMC Networking OS provides two predened buer proles, one for single-queue (for example, non-quality-of-service [QoS])
applications, and one for four-queue (for example, QoS) applications.
You must reload the system for the global buer prole to take eect, a message similar to the following displays: % Info: For the
global pre-defined buffer profile to take effect, please save the config and reload the system..
Dell EMC Networking OS Behavior: After you congure buer-prole global 1Q, the message displays during every bootup. Only one
reboot is required for the conguration to take eect; afterward you may ignore this bootup message.
Dell EMC Networking OS Behavior: If you congure 1Q, save the running-cong to the startup-config, and then delete the
startup-config and reload the chassis. The only way to return to the default buer prole is to remove the 1Q prole congured and
then reload the chassis.
If you have already applied a custom buer prole on an interface, the buffer-profile global command fails and a message similar
to the following displays: % Error: User-defined buffer profile already applied. Failed to apply global
pre-defined buffer profile. Please remove all user-defined buffer profiles.
Similarly, when you congure buffer-profile global, you cannot not apply a buer prole on any single interface. A message similar
to the following displays: % Error: Global pre-defined buffer profile already applied. Failed to apply
user-defined buffer profile on interface Te 1/1. Please remove global pre-defined buffer
profile.
To apply a predened buer prole, use the following command:
• Apply one of the predened buer proles for all port pipes in the system.
CONFIGURATION mode
buffer-profile global [1Q|4Q]
If the default buer prole dynamic is active, Dell EMC Networking OS displays an error message instructing you to remove the default
conguration using the
no buffer-profile global command.
Troubleshooting Packet Loss
The show hardware stack-unit command is intended primarily to troubleshoot packet loss.
To troubleshoot packet loss, use the following commands.
•
show hardware stack-unit stack-unit-number cpu data-plane statistics
•
show hardware stack-unit stack-unit-number cpu party-bus statistics
•
show hardware stack-unit stack-unit-number drops unit unit-number
•
show hardware stack-unit stack-unit-number unit unit-number {counters | details | port-stats
[detail] | register | ipmc-replication | table-dump}
•
show hardware {ip | ipv6 | mac} {eg-acl | in-acl} stack-unit stack-unit-number port-set 0
pipeline 0-3
•
show hardware ip qos stack-unit stack-unit-number port-set 0
•
show hardware system-flow layer2 stack-unit stack-unit-number port-set 0 {counters | pipeline
0-3}
•
show hardware drops interface interface
•
show hardware buffer-stats-snapshot resource interface interface
Debugging and Diagnostics
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