Extreme Networks ExtremeWare XOS Guide Manual page 145

Using sFlow
Configuring the Remote Collector Address
You can specify up to four remote collectors to send the sFlow data to. Typically, you would configure
the IP address of each collector. You may also specify a UDP port number different from the default
value of 6343, and/or a virtual router different from the default of VR-Mgmt. When you configure a
collector, the system creates a database entry for that collector that remains until the collector is
unconfigured. All the configured collectors are displayed in the
show sflow {configuration}
command. Configure the remote collector using the following command:
configure sflow collector {ipaddress} <ip-address> {port <udp-port-number>} {vr
<vrname>}
To unconfigure the remote collector and remove it from the database, use the following command:
unconfigure sflow collector {ipaddress} <ip-address> {port <udp-port-number>} {vr
<vrname>}
Enabling sFlow Globally on the Switch
Before the switch will start sampling packets for sFlow, you must enable sFlow globally on the switch.
To enable sFlow globally, use the following command:
enable sflow
You disable sFlow globally with the following command:
disable sflow
When you disable sFlow globally, the individual ports are also put into the disabled state. If you later
enable the global sFlow state, individual ports return to their previous state.
Enabling sFlow on the Desired Ports
Enable sFlow on specific ports using the following command:
enable sflow ports <port_list>
You may enable and disable sFlow on ports irrespective of the global state of sFlow, but samples are not
taken until both the port state and the global state are enabled.
To disable sFlow on ports, use the following command:
disable sflow ports <portlist>
Additional sFlow Configuration Options
There are three global options that you can configure to different values from the defaults. These affect
how frequently the sFlow data is sent to the remote collector, how frequently packets are sampled, and
the maximum number of sFlow samples that could be processed in the CPU per second.
You can also configure how frequently packets are sampled per port.
Polling Interval. Each port counter is periodically polled to gather the statistics to send to the collector. If
there is more than one counter to be polled, the polling is distributed in such a way that each counter is
visited once during each polling interval, and the data flows are spaced in time. For example, assume
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ExtremeWare XOS 11.1 Concepts Guide