SFlow configuration and usage on Dell 7048 (and other) switches

Via the web interface:

Navigate to: System->sFlow

Select "Receiver Configuration"

Receiver Owner: 1
Receiver IP : IP of server
Tick "No timeout"
Click Apply

Select "Sampler configuration"

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Set Sampler Datasource (anything)
Receiver Index as "Receiver Owner" above, e.g. 1
Sampler rate: 1024
Click Apply

On a Linux server, receiving the SFlow packets. Get sflowtool-3.25, untag it/build.

Create a tcpdump format capture of incoming data:

./sflowtool -t >  a.cap

View it in tcpdump:

tcpdump -r a.cap