Switching Commands
107
M4100 Series ProSAFE Managed Switches
Use the all keyword to display the per-port configuration parameters for all interfaces, or
specify the slot/port to display information about a specific interface.
Flow Control Commands
In 802.3x flow control, the MAC control PAUSE operation is specified in IEEE 802.3 Annex
31 B. It allows traffic from one device to be throttled for a specified period of time and is
defined for devices that are directly connected. A device that needs to inhibit transmission of
data frames from another device on the LAN transmits a PAUSE frame as defined in the
IEEE specification.
This feature allows the user to configure the switch to use symmetric, asymmetric, or no flow
control.
Asymmetric flow control allows the switch to respond to received PAUSE frames, but
the port cannot generate PAUSE frames. Symmetric flow control allows the switch to both
respond to and generate MAC control PAUSE frames.
flowcontrol
Use this command to enable or disable the symmetric or asymmetric flow control on the
switch. Use the no form of command to disable the symmetric or asymmetric flow control.
Asymmetric here means that Tx Pause can never be enabled. Only Rx Pause can be
enabled.
• Global Config
• Interface Config
Format show storm-control [all | <slot/port>]
Mode Privileged EXEC
Term Definition
Bcast Mode Shows whether the broadcast storm control mode is enabled or disabled. The factory
default is disabled.
Bcast Level The broadcast storm control level.
Mcast Mode Shows whether the multicast storm control mode is enabled or disabled.
Mcast Level The multicast storm control level.
Ucast Mode Shows whether the Unknown Unicast or DLF (Destination Lookup Failure) storm control
mode is enabled or disabled.
Ucast Level The Unknown Unicast or DLF (Destination Lookup Failure) storm control level.
Default Disabled
Format flowcontrol {symmetric | asymmetric}
Mode
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