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Cisco ME 3400 Ethernet Access Switch Command Reference
OL-9640-07
Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
flowcontrol
flowcontrol
Use the flowcontrol interface configuration command to set the receive flow-control state for an
interface. When flow control send is operable and on for a device and it detects any congestion at its
end, it notifies the link partner or the remote device of the congestion by sending a pause frame. When
flow control receive is on for a device and it receives a pause frame, it stops sending any data packets.
This prevents any loss of data packets during the congestion period.
Use the receive off keywords to disable flow control.
flowcontrol receive {desired | off | on}
Note The Cisco ME switch can only receive pause frames.
Syntax Description
Defaults The default is flowcontrol receive off.
Command Modes Interface configuration
Command History
Usage Guidelines The switch does not support sending flow-control pause frames. If the port is a user network interface
(UNI) or enhanced network interface (ENI), you must use the no shutdown interface configuration
command to enable it before using the flowcontrol command. UNIs and ENIs are disabled by default.
Network node interfaces (NNIs) are enabled by default.
Note that the on and desired keywords have the same result.
When you use the flowcontrol command to set a port to control traffic rates during congestion, you are
setting flow control on a port to one of these conditions:
• receive on or desired: The port cannot send out pause frames, but can operate with an attached
device that is required to or is able to send pause frames; the port is able to receive pause frames.
• receive off: Flow control does not operate in either direction. In case of congestion, no indication is
given to the link partner and no pause frames are sent or received by either device.
receive Set whether the interface can receive flow-control packets from a remote device.
desired Allow an interface to operate with an attached device that is required to send
flow-control packets or with an attached device that is not required to but can send
flow-control packets.
off Turn off the ability of an attached device to send flow-control packets to an interface.
on Allow an interface to operate with an attached device that is required to send
flow-control packets or with an attached device that is not required to but can send
flow-control packets.
Release Modification
12.2(25)EX This command was introduced.
- Reference 1
- CONTENTS 3
- Contents 10
- OL-9640-07 10
- A-11 13
- Audience 17
- Purpose 17
- Conventions 18
- Related Publications 18
- CLI Command Modes 21
- User EXEC Mode 22
- Privileged EXEC Mode 23
- Global Configuration Mode 23
- Interface Configuration Mode 24
- VLAN Configuration Mode 24
- Line Configuration Mode 24
- Ctrl-Z 25
- Cisco IOS Commands 27
- • The syntax for the FTP: 37
- • The syntax for the RCP: 37
- • The syntax for the TFTP: 37
- Switch# clear rep counters 77
- Switch# clear vmps statistics 81
- • module is always 0 87
- Switch# dot1x test timeout 27 111
- • service instance 126
- • ethernet uni 126
- • ethernet lmi t392 126
- • NTP broadcast service 166
- • NTP access restrictions 166
- • NTP authentication 166
- Transmission Control Protocol 293
- User Datagram Protocol 293
- • SPAN destination port 344
- • Private VLAN port 344
- • Tunnel port 344
- • Access port 344
- • cos—CoS value 362
- • dscp—DSCP value 364
- • Shutdown threshold 474
- • Drop threshold 474
- \ Command Description 523
- • 1000 Mbps—4 584
- • 100 Mbps—19 584
- • 10 Mbps—100 584
- command to display an 586
- • 1000 Mbps—20000 600
- • 100 Mbps—200000 600
- • 10 Mbps—2000000 600
- Ethernet ports 664
- Switch(config)# udld enable 675
- Switch# vmps reconfirm 692
- Switch(config)# vmps retry 7 694
- Boot Loader Commands 697
- • d—directory 704
- • r—readable 704
- • w—writable 704
- • x—executable 704
- [-test 707
- Debug Commands 723
- Show Platform Commands 803
- APPENDIX 851
- ) command A-11 858
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