4-5
Switching Pages
Flow Control
Flow Control
When a port becomes oversubscribed, it may begin dropping all traffic for small bursts of time during
the congestion condition. This can lead to high-priority and/or network control traffic loss. When 802.3x
flow control is enabled, a lower-speed switch can communicate with a higher-speed switch by
requesting that the higher-speed switch refrain from sending packets. Transmissions 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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