Reference Guide

772 | sFlow
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Back-off Mechanism
If you set the sampling rate for an interface is set to a very low value, the CPU can get overloaded with
flow samples under high-traffic conditions. In such a scenario, a binary back-off mechanism gets triggered,
which doubles the sampling-rate (halves the number of samples per second) for all interfaces. The back-off
mechanism continues to double the sampling-rate until CPU condition is cleared. After the back-off
changes the sample-rate, you must manually change the sampling rate to the desired value.
As a result of back-off, the actual sampling-rate of an interface may differ from its configured sampling
rate. You can view the actual sampling-rate of the interface and the configured sample-rate can be viewed
by using the
show sflow command.
sFlow on LAG ports
When a physical port becomes a member of a LAG, it inherits the sFlow configuration from the LAG port.
Extended sFlow
Platforms s and z support extended-switch information processing only.
Extended sFlow packs additional information in the sFlow datagram depending on the type of sampled
packet. The extended-switch information comprises 802.1Q VLAN ID and 802.1p priority information.
Command Syntax Command Mode Usage
sflow polling-interval
interval value
CONFIGURATION or
INTERFACE
Change the global default counter polling interval.
interval value—in seconds.
Range: 15 to 86400 seconds
Default: 20 seconds