AT-S63 Management Software Menus User’s Guide
Section I: Basic Operations
71
Configuring Flow Control and Back Pressure
A switch port uses flow control to control the flow of ingress packets from
its end node when operating in full-duplex mode.
A port using
flow control
issues a special frame, referred to as a PAUSE
frame, as specified in the IEEE 802.3x standard, to stop the transmission
of data from an end node. When a port needs to stop an end node from
transmitting data, it issues this frame. The frame instructs the end node to
cease transmission. The port continues to issue PAUSE frames until it is
again ready to receive data from the end node.
The default setting for flow control on a switch port is disabled.
Back pressure performs much the same function as flow control. Both are
used by a port to control the flow of ingress packets. Flow control applies
to ports operating in full-duplex; back pressure applies to ports operating in
half-duplex mode.
When a twisted pair port on the switch operating in half-duplex mode
needs to stop an end node from transmitting data, it forces a collision. A
collision on an Ethernet network occurs when two end nodes attempt to
transmit data using the same data link at the same time. A collision causes
the end nodes to stop sending data.
When a switch port needs to stop a half-duplex end node from transmitting
data, it forces a collision on the data link, which stops the end node. After
the switch is ready to receive data again, the switch stops forcing
collisions. This is called
back pressure
.
The default setting for back pressure on a switch port is disabled.
To set up flow control or back pressure, perform the following procedure:
1. From the Main Menu, type
1
to select Port Configuration.
The Port Configuration menu is shown in Figure 13 on page 62.
2. From the Port Configuration menu, type
1
to select Port Configuration.
The following prompt is displayed:
Enter port-list ->
3. Enter the number of the port to be configured. You can configure more
than one port at a time. You can specify the ports individually (for
example, 5,7,22), as a range (for example, 18-23), or both (for
example 1,5,14-22).
The Port Configuration menu is shown in Figure 15 on page 65.
Содержание AT-9400
Страница 16: ...Figures 16 ...
Страница 18: ...Tables 18 ...
Страница 28: ...Preface 28 ...
Страница 30: ...30 Section I Basic Operations ...
Страница 60: ...Chapter 1 Basic Switch Parameters 60 Section I Basic Operations ...
Страница 64: ...Chapter 2 Port Parameters 64 Section I Basic Operations Port Type The port type ...
Страница 84: ...Chapter 2 Port Parameters 84 Section I Basic Operations ...
Страница 124: ...Chapter 6 Static Port Trunks 124 Section I Basic Operations ...
Страница 144: ...144 Section II Advanced Operations ...
Страница 196: ...Chapter 10 File Downloads and Uploads 196 Section II Advanced Operations ...
Страница 218: ...Chapter 11 Event Logs and the Syslog Client 218 Section II Advanced Operations ...
Страница 242: ...Chapter 13 Access Control Lists 242 Section II Advanced Operations ...
Страница 294: ...294 Section III IGMP Snooping MLD Snooping and RRP Snooping ...
Страница 314: ...Chapter 19 MLD Snooping 314 Section III IGMP Snooping MLD Snooping and RRP Snooping ...
Страница 318: ...318 Section IV SNMPv3 ...
Страница 416: ...Chapter 21 SNMPv3 416 Section IV SNMPv3 ...
Страница 418: ...418 Section V Spanning Tree Protocols ...
Страница 470: ...470 Section VI Virtual LANs ...
Страница 478: ...Chapter 24 Port based and Tagged VLANs 478 Section VI Virtual LANs The new Sales VLAN has now been created ...
Страница 480: ...Chapter 24 Port based and Tagged VLANs 480 Section VI Virtual LANs The new Engineering VLAN has now been created ...
Страница 520: ...Chapter 26 Multiple VLAN Modes 520 Section VI Virtual LANs ...
Страница 532: ...Chapter 27 Protected Ports VLANs 532 Section VI Virtual LANs ...
Страница 546: ...546 Section VII Internet Protocol Routing ...
Страница 560: ...560 Section VIII Port Security ...
Страница 568: ...Chapter 30 MAC Address based Port Security 568 Section VIII Port Security ...
Страница 586: ...Chapter 31 802 1x Port based Network Access Control 586 Section VIII Port Security ...
Страница 588: ...588 Section IX Management Security ...
Страница 610: ...Chapter 33 Encryption Keys 610 Section IX Management Security ...
Страница 650: ...Chapter 36 TACACS and RADIUS Protocols 650 Section IX Management Security ...
Страница 660: ...Chapter 37 Management Access Control List 660 Section IX Management Security ...
Страница 668: ...Index 668 ...