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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 http://faqs.org/rfcs/rfc3176.html).`

To configure sFlow features:

  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 link aggregation group (LAG), but you can enable it on the member interfaces of a 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. To configure the polling interval and sample rate at the interface level:

    [edit protocols sflow interfaces interface-name]
    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.

  7. To specify an IP address to be used as the agent ID for the sFlow agent:

    [edit protocols sflow]
    user@switch# set agent-id ip-address
  8. To specify the source IP address to be used for sFlow datagrams:

    [edit protocols sflow]
    user@switch# set source-ip ip-address

Published: 2010-04-22

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