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CLI (Command Line Interface)
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NXA-ENET24 - Software Management Guide
Interface Commands (Cont.)
Command Function
flowcontrol
This command enables flow
control.
Use the no form to disable
flow control.
Syntax:
[no] flowcontrol
Default Setting: Flow control enabled
Command Mode: Interface Configuration (Ethernet, Port Channel)
Command Usage: Flow control can eliminate frame loss by “blocking” traffic
from end stations or segments connected directly to the switch when its buffers
fill. When enabled, back pressure is used for half-duplex operation and IEEE
802.3x for full-duplex operation.
To force flow control on or off (with the flowcontrol or no flowcontrol command),
use the no negotiation command to disable auto-negotiation on the selected
interface.
When using the negotiation command to enable auto-negotiation, the optimal
settings will be determined by the capabilities command. To enable flow control
under auto-negotiation, “flowcontrol” must be included in the capabilities list for
any port
Avoid using flow control on a port connected to a hub unless it is actually
required to solve a problem. Otherwise back pressure jamming signals may
degrade overall performance for the segment attached to the hub.
Example: The following example enables flow control on port 5:
Console(config)#interface ethernet 1/5
Console(config-if)#flowcontrol
Console(config-if)#no negotiation
Console(config-if)#
shutdown
This command disables an
interface.
To restart a disabled
interface, use the no form.
Syntax:
[no] shutdown
Default Setting: All interfaces are enabled.
Command Mode: Interface Configuration (Ethernet, Port Channel)
Command Usage: This command allows you to disable a port due to abnormal
behavior (e.g., excessive collisions), and then re-enable it after the problem has
been resolved. You may also want to disable a port for security reasons.
Example: The following example disables port 5:
Console(config)#interface ethernet 1/5
Console(config-if)#shutdown
Console(config-if)#
switchport broadcast
packet-rate
This command configures
broadcast storm control.
Use the no form to disable
broadcast storm control.
Syntax:
switchport broadcast octet-rate rate
no switchport broadcast
• rate - Threshold level as a rate; i.e., octets per second.
(Range: 64-95232000)
Default Setting: Enabled for all ports
Packet-rate limit: 32000 octets per second
Command Mode: Interface Configuration (Ethernet)
Command Usage: When broadcast traffic exceeds the specified threshold,
packets above that threshold are dropped.
This command can enable or disable broadcast storm control for the selected
interface. However, the specified threshold value applies to all ports on the
switch.
Example: The following shows how to configure broadcast storm control at 600
packets per second:
Console(config)#interface ethernet 1/5
Console(config-if)#switchport broadcast octet-rate 600
Console(config-if)#