Chapter 7: Port Parameters
150
Section II: Basic Operations
Enabling or Disabling Flow Control
When a port that is operating in full-duplex mode needs to temporarily stop
its local or remote counterpart from sending any further packets, it initiates
flow control by sending what are known as pause packets. Pause packets
instruct the link partner to stop sending packets to allow the sender of the
packets time to process the packets already stored in its buffers.
There are two aspects to flow control on the ports on the switch. The first
is whether or not a port will issue pause packets during periods of buffer
congestion. The other is whether or not a port will stop sending packets
when it receives pause packets from another network device. You can
control both of these aspects of flow control on the ports on the switch.
Flow control is set with the FLOWCONTROL RECEIVE command and the
the FLOWCONTROL SEND command. The formats of the commands
are:
flowcontrol send on|off
flowcontrol receive on|off
The FLOWCONTROL SEND command controls whether or not a port
sends pause packets during periods of packet congestion. If you set it to
ON, the port sends pause packets when it reaches the point of packet
congestion. If you set it to oFF, the port does not send pause packets. At
the default setting, the send portion of flow control is off.
The FLOWCONTROL RECEIVE command is used to control whether or
not a port stops transmitting packets when it receives pause packets from
its local or remote counterpart. If you set it to ON, a port stops transmitting
packets when it receives pause packets. If you set it to OFF, a port does
not stop transmitting packets when it receives pause packets. At the
default setting, the receive portion of flow control is off.
The commands are located in the Port Interface mode. This example
configures ports 12 and 13 to 100Mbps, full-duplex mode. The receive
portion of flow control is disabled so that the ports ignore any pause
packets that they receive from their link partners:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.12,port1.0.13
awplus(config-if)# speed 100
awplus(config-if)# duplex full
awplus(config-if)# flowcontrol receive off
Summary of Contents for AT-9000/28
Page 4: ......
Page 26: ...Contents 26...
Page 30: ...Tables 30...
Page 36: ...36 Section I Getting Started...
Page 70: ...Chapter 2 Starting a Management Session 70 Section I Getting Started...
Page 96: ...96 Section II Basic Operations...
Page 142: ...Chapter 6 Basic Switch Management Commands 142 Section II Basic Operations...
Page 220: ...Chapter 9 IPv4 and IPv6 Management Addresses 220 Section II Basic Operations...
Page 244: ...Chapter 10 IPv4 and IPv6 Management Address Commands 244 Section II Basic Operations...
Page 264: ...Chapter 12 SNTP Client Commands 264 Section II Basic Operations...
Page 298: ...Chapter 15 Enhanced Stacking 298 Section II Basic Operations...
Page 312: ...Chapter 16 Enhanced Stacking Commands 312 Section II Basic Operations...
Page 318: ...Chapter 17 Port Mirror 318 Section II Basic Operations...
Page 324: ...Chapter 18 Port Mirror Commands 324 Section II Basic Operations Example awplus show mirror...
Page 350: ...Chapter 21 Multicast Commands 350 Section II Basic Operations...
Page 352: ...352 Section III File System...
Page 360: ...Chapter 22 File System 360 Section III File System...
Page 383: ...AT 9000 Switch Command Line User s Guide Section III File System 383 Example awplus show boot...
Page 386: ...Chapter 25 Boot Configuration File Commands 386 Section III File System...
Page 398: ...Chapter 26 File Transfers 398 Section III File System...
Page 406: ...Chapter 27 File Transfer Commands 406 Section III File System...
Page 408: ...408 Section IV Event Messages...
Page 430: ...Chapter 30 Syslog Client 430 Section IV Event Messages...
Page 438: ...438 Section V Port Trunks...
Page 448: ...Chapter 32 Static Port Trunks 448 Section V Port Trunks...
Page 480: ...480 Section VI Spanning Tree Protocols...
Page 520: ...Chapter 38 STP Commands 520 Section VI Spanning Tree Protocols...
Page 558: ...558 Section VII Virtual LANs...
Page 600: ...Chapter 42 Port based and Tagged VLAN Commands 600 Section VII Virtual LANs...
Page 634: ...Chapter 44 GARP VLAN Registration Protocol Commands 634 Section VII Virtual LANs...
Page 670: ...Chapter 47 Private Port VLANs 670 Section VII Virtual LANs...
Page 692: ...Chapter 50 VLAN Stacking 692 Section VII Virtual LANs...
Page 698: ...Chapter 51 VLAN Stacking Commands 698 Section VII Virtual LANs...
Page 700: ...700 Section VIII Port Security...
Page 748: ...Chapter 54 802 1x Port based Network Access Control 748 Section VIII Port Security...
Page 790: ...Chapter 55 802 1x Port based Network Access Control Commands 790 Section VIII Port Security...
Page 792: ...792 Section IX Simple Network Management Protocols...
Page 804: ...Chapter 56 SNMPv1 and SNMPv2c 804 Section X Simple Network Management Protocols...
Page 852: ...852 Section X Network Management...
Page 976: ...Chapter 63 Address Resolution Protocol ARP 976 Section X Network Management...
Page 1090: ...1090 Section XI Management Security...
Page 1114: ...Chapter 71 Telnet Server 1114 Section XI Management Security...
Page 1122: ...Chapter 73 Telnet Client 1122 Section XI Management Security...
Page 1126: ...Chapter 74 Telnet Client Commands 1126 Section XI Management Security...
Page 1138: ...Chapter 75 Secure Shell SSH Server 1138 Section XI Management Security...
Page 1158: ...Chapter 78 Non secure HTTP Web Browser Server Commands 1158 Section XI Management Security...
Page 1186: ...Chapter 80 Secure HTTPS Web Browser Server Commands 1186 Section XI Management Security...
Page 1202: ...Chapter 81 RADIUS and TACACS Clients 1202 Section XI Management Security...
Page 1230: ...Chapter 82 RADIUS and TACACS Client Commands 1230 Section XI Management Security...