Users Guide

648 Monitoring Switch Traffic
Traffic Monitoring Examples
This section contains the following examples:
• Showing Interface Traffic
• Configuring sFlow
• Configuring RMON
• Configuring Remote Capture
• Configuring RSPAN
Showing Interface Traffic
Use the show interfaces utilization and show interfaces traffic commands to
display information about interface traffic and internal packet buffer usage.
The following are examples of the output of these commands. Refer to the
Dell EMC Networking N1100-ON, N1500, N2000, N2100-ON, N2200-ON,
N3000E-ON, N3100-ON, and N3200-ON Series Switches CLI Reference
Guide
for more details about the output. The N1100-ON Series switches do
not support accounting for color drops. The counters remain fixed at 0.
This example shows Gi1/0/1 is suffering from congestion (Tx Queue high)
and is dropping packets, either due to WRED drops or due to exceeding the
internal buffer limits.
console#show interfaces traffic
Intf Congestion Tx Queue Rx Queue Color Drops (Pkts) Tx Queue
Name Drops (Pkts) (Cells) (Cells) Yellow Red (Pkts)
------ ----------- -------- -------- -------- --------- --------
Gi1/0/1 18981 132 0 0 0 13
Gi1/0/2 0 0 0 0 0 0
Gi1/0/3 0 0 0 0 0 0
The following example shows a classical incast situation on interface Gi1/0/2
where the port is fully utilized or nearly fully utilized, buffering many frames
(with increased latency) and beginning to drop frames as the internal
thresholds for buffering on the port are reached. A conscientious network
operator might want to examine why the devices attached to Gi1/0/5 and
Gi1/0/6 are sending so much traffic to Gi1/0/2 attached devices and
redistribute the devices, rate-limit traffic egressing the devices attached to
Gi1/0/5 and Gi1/0/6, or increase the number of links available for the device
attached to Gi1/0/2.