Cisco Catalyst 4500 Series Command Reference Manual page 308

flowcontrol
Usage Guidelines The pause frames are special packets that signal a source to stop sending frames for a specific period of
time because the buffers are full.
Table 2-4
keywords with the flowcontrol command.
Table 2-4
Configuration
send on
send off
send desired
receive on
receive off
receive desired
Table 2-5
based on their speed settings.
Table 2-5
Interface Type
10/100/1000BASE-TX
1000BASE-T
1000BASE-X
1000BASE-X
Examples
This example shows how to enable send flow control:
Switch(config-if)# flowcontrol receive on
Switch(config-if)#
This example shows how to disable send flow control:
Switch(config-if)# flowcontrol send off
Switch(config-if)#
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0SG and IOS 15.1(1)SG)
2-250
describes the guidelines for using the different configurations of the send and receive
Keyword Configurations for send and receive
Description
Enables a local port to send pause frames to remote ports. To obtain
predictable results, use send on only when remote ports are set to
receive on or receive desired.
Prevents a local port from sending pause frames to remote ports. To
obtain predictable results, use send off only when remote ports are set
to receive off or receive desired.
Obtains predictable results whether a remote port is set to receive on,
receive off, or receive desired.
Enables a local port to process pause frames that a remote port sends.
To obtain predictable results, use receive on only when remote ports
are set to send on or send desired.
Prevents remote ports from sending pause frames to a local port. To
obtain predictable results, use send off only when remote ports are set
to receive off or receive desired.
Obtains predictable results whether a remote port is set to send on,
send off, or send desired.
identifies how the flow control will be forced or negotiated on the Gigabit Ethernet interfaces
Send Capability by Switch Type, Module, and Port
Configured Speed
Speed 1000
Negotiation always enabled
No speed nonegotiation
Speed nonegotiation
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Advertised Flow Control
Configured flow control always
Configured flow control always
negotiated
Configured flow control negotiated
Configured flow control forced
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