Interface Commands
4-225
4
Related Commands
negotiation (4-223)
speed-duplex (4-222)
flowcontrol (4-225)
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 802.3-2005
(formally 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 (4-223)
capabilities (flowcontrol, symmetric) (4-224)
Console(config)#interface ethernet 1/5
Console(config-if)#flowcontrol
Console(config-if)#no negotiation
Console(config-if)#
Summary of Contents for 6152PL2 FICHE
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Page 6: ...vi ...
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Page 32: ...Tables xxxii ...
Page 38: ...Figures xxxviii ...
Page 56: ...Initial Configuration 2 10 2 ...
Page 378: ...Configuring the Switch 3 322 3 ...
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