Configure the Packet Sampling Rate
Configure the packet sampling rate at port level to determine how many packets the system counts before it takes a sample. Configuring the sampling rate enables sFlow on the port.
Before you begin
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You must globally enable sFlow.
About this task
If you configure a conservative sampling rate to prevent overloading the sFlow agent, the result will reflect high values that do not reflect typical traffic levels.
Procedure
Example
Configure sampling rates for ports 2/1, 2/2, 2/3, and 2/4.
Switch:1(config-if)#interface gigabitethernet 2/1,2/2 Switch:1(config-if)#sflow collector 1 Switch:1(config-if)#sflow sampling-rate 10000 Switch:1(config-if)#interface gigabitethernet 2/3 Switch:1(config-if)#sflow collector 2 Switch:1(config-if)#sflow sampling-rate 8192 Switch:1(config-if)#interface gigabitethernet 2/4 Switch:1(config-if)#sflow collector 2 Switch:1(config-if)#sflow sampling-rate 12001 Switch:1(config-if)#show sflow interface enabled ============================================================================= sFlow Port Configuration Info ============================================================================= Port Packet-Sample-Rate Max-Header-Size Counter-interval Collector-list (in secs) ----------------------------------------------------------------------------- 2/1 10000 128 0 1 2/2 10000 128 0 1 2/3 8192 128 0 2 2/4 12001 128 0 2 ----------------------------------------------------------------------------- All 4 out of 4 Total Num of sflow port entries displayed
Variable Definitions
Use the data in the following table to use the sflow sampling-rate and show sflow interface commands.
Variable |
Value |
---|---|
<1024–1000000> |
Configures the packet sampling rate on a port. The default value is 0 (disabled). To configure the default value, enter default sflow sampling-rate. |
{slot/port[/sub-port] [-slot/port[/sub-port]] [,...]} |
Identifies the slot and port in one of the following formats: a single slot and port (slot/port), a range of slots and ports (slot/port-slot/port), or a series of slots and ports (slot/port,slot/port,slot/port). If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port. |