Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

14-5
sFlow Agent
Overview
The Wireless Edge Services xl Module can accommodate up to six sFlow
receivers. The module’s receiver instances can be configured in one of
three ways:
1. The sFlow receiver contacts the module’s agent and uses SNMP to reserve
and configure a receiver instance (only instances 4, 5, and 6).
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
controlled 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 xl 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: Config-
uring the ProCurve Wireless Edge Services xl 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 xl Module forwards datagrams.
See Appendix A: ProCurve Wireless Services xl 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.