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How to configure sFlow on Juniper EX and QFX switches

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Before you begin, be aware:

  • These devices support up to four Auvik collectors being connected. 
  • sFlow can’t be configured on a Layer 3 VLAN-tagged interface.
  • sFlow can’t be configured on a Link Aggregation Group (LAG) interface, but can be enabled on the member of a LAG.

These instructions assume:

Access the switch CLI

  1. Telnet or SSH into the switch.
  2. Enter privileged mode by typing enable and entering your enable password.

Configure sFlow

Run the following command. Replace <AuvikCollectorIP> with the IP address of your Auvik collector, and <AuvikPort> with one of the following port numbers: 2055, 2056, 4432, 4739, 6343, 9995, or 9996. Replace <sampleRate> with the desired sample-rate egress: 128, 256, 512, or 1024.

set sflow collector <AuvikCollectorIP> udp-port <AuvikPort>
set interfaces <interface>
set polling-interval 60
set sample-rate egress <sampleRate>
  
# Example: # set sflow collector 10.204.32.46 udp-port 2055 # set sflow interfaces ge-0/0/0
# set sflow polling-interval 60 # set sflow sample-rate egress 1

Confirm the settings

Run the following command to confirm the configuration: 

show sflow collector
show sflow interface

Reference:

https://www.juniper.net/documentation/en_US/junos/topics/example/sflow-configuring-ex-series.html

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