Configuration Considerations - Dell PowerConnect B-RX Configuration Manual

sFlow
sFlow is a system for observing traffic flow patterns and quantities within and among a set of
BigIron RX devices. Participating devices also relay byte and packet counter data (counter samples)
for ports to the collector.
sFlow is described in RFC 3176, "InMon Corporation's sFlow, A Method for Monitoring Traffic in
Switched and Routed Networks". Refer to this RFC to determine the contents of the sampled
packet.

Configuration considerations

Consider the following when you configure sFlow:
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Source 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.
sFlow looks for an IP address in following order, and uses the first address found:
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NOTE
The device uses the router ID only if the device also has an IP interface with the same address.
NOTE
If an IP address in not already configured when you enable sFlow, the feature uses the source
address 0.0.0.0. To display the agent_address, enable sFlow, then enter the show sflow command.
Refer to
page 1034.
NOTE
If you change the address sFlow will use for the agent_address, you must disable and re-enable
sFlow to enable the feature to use the changed address.
BigIron RX Series Configuration Guide
53-1001810-01
Sample data is collected from inbound traffic on ports enabled for sFlow. However, both traffic
directions are counted for byte and packet counter statistics sent to the collector.
sFlow packets are not forwarded on the management interface, you will need to configure the
IP interface on a line module to forward the sFlow packets.
sFlow can not be configured on Link Aggregation ports until Link Aggregation is established.
Once Link Aggregation is established, then the sFlow parameter appears on the interface
mode which is configured Link Aggregation.
The router ID configured by the ip router-id command
The first IP address on the lowest-numbered loopback interface
The first IP address on the lowest-numbered virtual interface
The first IP address on any interface
"Enabling sFlow forwarding" on page 1029 and "Displaying sFlow information"
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