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Configuring sFlow Technology for Network Monitoring (CLI Procedure)

You can configure sFlow technology, designed for monitoring high-speed switched or routed networks, to continuously monitor traffic at wire speed on all interfaces simultaneously. JUNOS software fully supports the sFlow standard described in RFC 3176, InMon Corporation's sFlow: A Method for Monitoring Traffic in Switched and Routed Networks (see RFC 3176).

To configure sFlow features using the CLI:

  1. Configure the IP address of the collector.
    [edit protocols sflow]
    user@switch# set collector <ip-address>
  2. Configure the UDP port of the collector. The default UDP port assigned is 6343.
    [edit protocols sflow]
    user@switch# set collector udp-port <port-number>
  3. Enable sFlow technology on a specific interface:
    [edit protocols sflow]
    user@switch# set interfaces interface-name

    Note: You cannot enable sFlow technology on a Layer 3 VLAN-tagged interface.

    You cannot enable sFlow technology on a LAG interface. sFlow technology can be enabled on the member interfaces of the LAG.

  4. Specify how often the sFlow agent polls the interface:
    [edit protocols sflow]
    user@switch# set polling-interval seconds

    Note: Specify 0 if you do not want to poll the interface.

  5. Specify the rate at which packets must be sampled:
    [edit protocols sflow]
    user@switch# set sample-rate number
  6. You can also configure the polling interval and sample rate at the interface level.
    [edit protocols sflow interfaces]
    user@switch# set polling-interval seconds
    [edit protocols sflow interfaces]
    user@switch# set sample-rate number

    Note: The interface-level configuration overrides the global configuration.