Cisco 4500M Command Reference Manual page 133

Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Command History Release
12.1(8a)EW
Usage Guidelines
Pause frames are special packets that signal a source to stop sending frames for a specific period of time
because the buffers are full.
Table2-5
the flowcontrol command.
Table2-5
Configuration
send on
send off
send desired
receive on
receive off
receive desired
Table2-6
on their speed settings.
Note
Catalyst 4006 switches support flow control only on gigabit interfaces.
Table2-6
Interface Type
10/100/1000BASE-TX
1000BASE-T
1000BASE-X
1000BASE-X
78-16201-01
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
describes guidelines for using different configurations of the send and receive keywords with
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 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 flow control will be forced or negotiated on Gigabit Ethernet interfaces based
Send Capability by Switch Type, Module, and Port
Configured Speed
Speed 1000
Negotiation always enabled
No speed nonegotiation
Speed nonegotiation
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
Advertised Flow Control
Configured flow control always
Configured flow control always
negotiated
Configured flow control negotiated
Configured flow control forced
flowcontrol
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