WESM zl Management and Configuration Guide WT.01.28 and greater

13-5
sFlow Agent
Overview
The sFlow receiver reserves the instance by writing its owner string into that
instance on the sFlow receiver table. The receiver also configures a receiver
timeout value for itself. The agent counts down the receiver timeout; when the
timeout nears expiration, the sFlow receiver can reset the timeout to a higher
value if it wants to retain control of the instance. But if the receiver no longer
needs samples from the agent, it allows the timeout to expire. The agent erases
the sFlow receiver’s owner string and allows another sFlow receiver to claim
the instance.
When the sFlow receiver reserves a receiver instance, it also configures one or
both of two types of sFlow instances. One type allows the receiver to receive
flow samples, and the other allows it to receive counters from polled radios.
When an sFlow receiver automatically configures sFlow, all settings are con-
trolled through the sFlow receiver’s management software, including settings
for flow sampling rates and counter polling intervals.
You must ensure that the sFlow receiver can contact the Wireless Edge Services
zl Module via SNMP, but you do not need to complete any steps to set up sFlow.
(See “SNMP Support” on page 2-24 of Chapter 2: “Configuring the ProCurve
Wireless Edge Services zl Module.”)
2. You configure the instance manually through the command line interface (CLI).
Use this (or the next) option when the sFlow receiver cannot configure the
receiver instance itself. You might also choose this option for increased security.
You control to which sFlow receivers the Wireless Edge Services zl Module
forwards datagrams.
See Appendix A: “ProCurve Wireless Edge Services zl Module Command Line
Reference.”
3. You configure the instance manually through the Web browser interface (only
instances 4, 5, and 6).
As with the CLI option, use this option when the sFlow receiver cannot configure
the receiver instance itself or when you want more control.
You must specify all settings, including the sFlow receiver’s IP address and port,
as well as owner string and timeout. To enable packet sampling or counter
polling, you must configure an available sFlow instance of the appropriate type.
Then match the instance to the receiver instance.
This chapter focuses on configuring sFlow manually through the Web browser
interface.