Dell FCX624-I Laptop User Manual


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1434 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
sFlow
A
2097152
8388608
33554432
134217728
536870912
2147483648
For example, if the configured sampling rate is 1000, then the actual rate is 2048 and 1 in 2048
packets are sampled by the hardware.
Changing the sampling rate of a module
You cannot change a module sampling rate directly. You can change a module sampling rate only
by changing the sampling rate of a port on that module.
Changing the sampling rate on a port
You can configure an individual port to use a different sampling rate than the global default
sampling rate. This is useful in cases where ports have different bandwidths. For example, if you
are using sFlow on 10/100 ports and Gbps Ethernet ports, you might want to configure the Gbps
ports to use a higher sampling rate (and thus gather fewer samples per number of packets) than
the 10/100 ports.
To change the sampling rate on an individual port, enter a command such as the following at the
configuration level for the port.
PowerConnect(config-if-1/1)#sflow sample 8192
Syntax: [no] sflow sample <num>
The <num> parameter specifies the average number of packets from which each sample will be
taken. The software rounds the value you enter up to the next odd power of 2. The actual sampling
rate becomes one of the values listed in “Changing the default sampling rate”.
Changing the sampling rate for a trunk port
You can configure an individual static trunk port to use a different sampling rate than the global
default sampling rate. This feature is also supported on LACP trunk ports. This feature is useful in
cases where ports have different bandwidths. For example, if you are using sFlow on 10/100 ports
and Gbps Ethernet ports, you might want to configure the Gbps ports to use a higher sampling rate
(and thus gather fewer samples per number of packets) than the 10/100 ports.
To change the sampling rate on an individual trunk port, enter commands such as the following.
PowerConnect(config)#trunk e 4/1 to 4/8
PowerConnect(config-trunk-4/1-4/8)#config-trunk-ind
PowerConnect(config-trunk-4/1-4/8)#sflow-subsampling e 4/2 8192
Syntax: [no] sflow sample ethernet <port> <num>
Specify the <port> variable in the following formats:
PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
The <num> parameter specifies the average number of packets from which each sample will be
taken. The software rounds the value you enter up to the next odd power of 2. The actual sampling
rate becomes one of the values listed in “Changing the default sampling rate”.