Monitoring The Qos Packet Buffer - Cisco Nexus 9000 Series Configuration Manual

Configuring Queuing and Scheduling
The show hardware qos min-buffer command is used to display the current buffer configuration.

Monitoring the QoS Packet Buffer

The Cisco Nexus 9000 Series device has a 12-MB buffer memory that divides into a dedicated per port and
dynamic shared memory. Each front-panel port has four unicast queues and four multicast queues in egress.
In the scenario of burst or congestion, each egress port consumes buffers from the dynamic shared memory.
You can display the real-time and peak status of the shared buffer per port. All counters are displayed in terms
of the number of cells. Each cell is 208 bytes in size. You can also display the global level buffer consumption
in terms of consumption and available number of cells.
Monitoring the shared buffer on ALE enabled devices is not supported for the port level.
Note
Note In the examples shown in this section, the port numbers are Broadcom ASIC ports.
This example shows how to clear the system buffer maximum cell usage counter:
switch# clear counters buffers
Max Cell Usage has been reset successfully
This example shows how to set a buffer utilization threshold for a specific module:
switch(config)# hardware profile buffer info port-threshold module 1 threshold 10
Port threshold changed successfully
Note The buffer threshold feature is not enabled for ports if they have a no-drop class configured (PFC).
The configured threshold buffer count is checked every 5 seconds against all the buffers used by that port
Note
across all the queues of that port.
You can configure the threshold percentage configuration for all modules or for a specific module, which
Note
is applied to all ports. The default threshold value is 90% of the switch cell count of shared pool SP-0.
This configuration applies to both Ethernet (front panel) and internal (HG) ports.
The buffer threshold feature is not supported for ACI capable device ports.
Note
This example shows how to display the interface hardware mappings:
eor15# show interface hardware-mappings
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x

Monitoring the QoS Packet Buffer

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