Installation manual

4-191
SIGNAMAX LLC • www.signamax.eu
Related Commands
negotiation (4-189)
speed-duplex (4-188)
flowcontrol (4-191)
flowcontrol
This command enables flow control. Use the no form to disable flow control.
Syntax
[no] flowcontrol
Default Setting
Disabled
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.
Related Commands
negotiation (4-189)
capabilities (flowcontrol, symmetric) (4-190)
Console(config)#interface ethernet 1/5
Console(config-if)#flowcontrol
Console(config-if)#no negotiation
Console(config-if)#