Dell PowerConnect B-DCX-4s User's Guide download pdf (Page 49)

Flow Vision Administrator’s Guide 37

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Flow Generator management

Resetting Flow Generator flow statistics

To manually clear the frame count statistics for a Flow Generator flow, enter flow --reset flowname

-feature generator. The following example clears the statistics for the Flow Generator flow named

“Flow1”.

switch:admin> flow --reset Flow1 -feature generator

Customizing Flow Generator flows

Flow Generator allows you to specify the frame payload size and pattern to be used for the

Flow Generator flows by using the flow --control command.

Frame payload size

Flow Generator allows you to define the frame payload size in bytes. There are two ways to change

the frame payload size: changing the default payload size and changing the payload size for a

single flow. You can use flow --show -ctrlcfg to see the current payload size. If you include the flow

name in the command, it will show the current payload size for only that flow.

The frame payload size value must be either 0 (which produces frames of random size) or a

multiple of 4 in the range from 64 through 2048. (64, 120, 140, 320, 512 and so on). The default

payload size value is 2048.

Changing the default frame payload size

Assigning a frame payload size without defining a flow creates a default that applies to all flows

created afterward. The following example sets the payload size default for all new flows to 512 bytes.

switch:admin> flow --control -feature generator -size 512

Changing a flow frame size

Assigning a frame payload size explicitly to a flow affects only that flow and overrides the existing

payload size for that flow. Changing a flow’s payload size can only be done to an inactive flow. The

following example changes the payload size for the flow “F1” to 1024 bytes.

switch:admin> flow --control F1 -feature generator -size 1024

Frame payload pattern

Flow Generator allows you to define the pattern to be used as the frame payload. There are two ways

to change a frame payload pattern: changing the default payload pattern and changing the payload

pattern for a single flow. You can use flow --show -ctrlcfg to see the current payload pattern. If you

include the flow name in the command, it will show the current payload pattern for only that flow.

The frame payload pattern must be an alphanumeric ASCII string between 1 and 32 characters in

length. The default frame payload pattern value is 0, which produces a random pattern of

alphanumeric ASCII characters with a variable string length.

Changing the default frame payload pattern

Assigning a frame payload pattern without defining a flow creates a default that applies to all

subsequently-created flows. The following example sets the default payload pattern for all new

flows to “TestFlow”.

switch:admin> flow --control -feature generator -pattern "TestFlow"

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Dell PowerConnect B-DCX-4s User's Guide Page 49