Cisco Catalyst 3750 User Manual

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Catalyst 3750 Switch Command Reference
OL-8552-07
Chapter 2 Catalyst 3750 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 switch can receive, but not send, 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.
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 pause frames, but can operate with an attached device
that is required to or is able to send pause frames. The port can 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
12.1(11)AX This command was introduced.

Cisco Catalyst 3750 Specifications

General

Device Type	Switch
Switching Capacity	32 Gbps
Forwarding Rate	38.7 Mpps
Stacking Bandwidth	32 Gbps
RAM	128 MB
Jumbo Frame Support	Yes
Switch Type	Managed
Model	Catalyst 3750 Series
Uplink Interfaces	SFP
Form Factor	Rack-mountable
MAC Address Table Size	12, 000 entries
Routing Protocol	RIP, OSPF, EIGRP
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Layer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)	PoE
Operating Temperature	-5 - 45 °C
Operating Humidity	10% to 85% non-condensing