sFlow and Agent Address

The sampled sFlow data sent to the collectors includes an agent_address field. This field identifies the IP address of the device that sent the data:

  • On an ICX switch with IPv6 interfaces only, sFlow looks for an IPv6 address in the following order, and uses the first address found:
    • The first IPv6 address on the lowest-numbered loopback interface
    • The first IPv6 address on the lowest-numbered virtual interface
    • The first IPv6 address on any interface
  • On an ICX switch with both IPv4 and IPv6 interfaces, or with IPv4 interfaces only, sFlow looks for an IP address in the following order, and uses the first address found:
    • The IPv4 router ID configured by the ip router-id command
    • The first IPv4 address on the lowest-numbered loopback interface
    • The first IPv4 address on the lowest-numbered virtual interface
    • The first IPv4 address on any interface
Note: A device uses the router ID only if the device also has an IP interface with the same address. The router ID is not supported on IPv6 devices.
Note: If an IP address is not already configured when you enable sFlow, the sFlow version 5 feature uses the source address 0.0.0.0. To display the agent_address, enable sFlow, and then enter the show sflow command. Refer to step 7 in Configuring sFlow and Displaying sFlow information.
Note: In sFlow version 5, you can set an arbitrary IPv4 or IPv6 address as the sFlow agent IP address. Refer to step 3 in Configuring sFlow Version 5.
Parent topic: sFlow Configuration Considerations