Brocade Communications Systems 6650 manual Changing the default sampling rate

sFlow 11

When you enable sFlow on a port, the port's sampling rate is set to the global default sampling rate. This also applies to ports on which you disable and then re-enable sFlow. The port does not retain the sampling rate it had when you disabled sFlow on the port, even if you had explicitly set the sampling rate on the port.

Changing the default sampling rate

To change the default (global) sampling rate, enter a command such as the following at the global CONFIG level of the CLI.

Brocade(config)#sflow sample 2048

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 to the next higher odd power of 2. This value becomes the actual default sampling rate and is one of the following:

•2

•8

•32

•128

•512

•2048

•4096

•8192

•32768

•131072

•524288

•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.

Brocade ICX 6650 Administration Guide	261
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