Cisco Catalyst 2950 Command Reference

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
flowcontrol
flowcontrol
Use the flowcontrol interface configuration command to set the receive or send flow-control value for
a Gigabit Ethernet interface. When flow control send is 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 the remote 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 and send off keywords to disable flow control.
flowcontrol {receive | send} {desired | off | on}
Note This flowcontrol command applies only to switch and module ports operating at 1000 Mbps.
Syntax Description
Defaults The defaults for 10/100/1000, GBIC-module ports, and small form-factor pluggable (SFP) -module ports
are flowcontrol receive off and flowcontrol send desired.
Command Modes Interface configuration
Command History
receive Sets whether the interface can receive flow-control packets from a remote device.
send Sets whether the interface can send flow-control packets to a remote device.
desired When used with receive, allows 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.
When used with send, the interface sends flow-control packets to a remote device
if the remote device supports it.
off When used with receive, turns off an attached device’s ability to send flow-control
packets to an interface. When used with send, turns off the local port’s ability to
send flow-control packets to a remote device.
on When used with receive, allows 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.
When used with send, the interface sends flow-control packets to a remote device
if the remote device supports it.
Release Modification
12.0(5.2)WC(1) This command was introduced.
12.1(6)EA2 The asymmetric and symmetric keywords were replaced with the receive,
send, off, on, and desired keywords.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz