4-5
Switching
Flow Control
Flow Control
When a port becomes oversubscribed, it may begin to lose data by dropping traffic intermittently. When
802.3x flow control is enabled, a lower-speed switch is able to communicate with a higher-speed switch
without losing data by requesting that the higher-speed switch refrain from sending packets. Transmis-
sions are temporarily halted to prevent buffer overflows.
Note Flow control works well when the Link Speed is auto-negotiated.
Use the Flow Control page to enable or disable this functionality. It is disabled by default and can be
configured globally across all the ports.
To display the Flow Control page, click Switching > Flow Control in the navigation pane.
As shown in the example configuration in Figure 4-4, flow control is enabled globally, which would
enable flow control on all the ports in the switch.
Figure 4-4. Flow Control Page
Table 4-4. Flow Control Fields
Click Apply to save any changes for the current boot session; the changes take effect immediately.
Field Description
Enable Flow Control Enable flow control on the switch. Clear to disable the feature.
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