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H3C Loopback Detection Feature Manual
Release 2107
Chapter 1 Loopback Detection Configuration............................................................................ 1-1
1.1 Loopback Detection Configuration..................................................................................... 1-1
1.1.1 Loopback Detection Overview ................................................................................ 1-1
1.1.2 Configuring Loopback Detection for Ethernet Port(s) ............................................. 1-2
Chapter 2 Loopback Detection Configuration Commands ....................................................... 2-1
2.1 Loopback Detection Configuration Commands ................................................................. 2-1
2.1.1 loopback-detection control enable .......................................................................... 2-1
2.1.2 loopback-detection enable ...................................................................................... 2-2
2.1.3 loopback-detection interface-list enable.................................................................. 2-4
2.1.4 loopback-detection interval-time ............................................................................. 2-5
2.1.5 loopback-detection per-vlan enable ........................................................................ 2-5
2.1.6 loopback-detection shutdown enable...................................................................... 2-6
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Page 1: Table Of Contents
H3C Loopback Detection Feature Manual Release 2107 Table of Contents Table of Contents Chapter 1 Loopback Detection Configuration................1-1 1.1 Loopback Detection Configuration..................1-1 1.1.1 Loopback Detection Overview ................1-1 1.1.2 Configuring Loopback Detection for Ethernet Port(s) ..........1-2 Chapter 2 Loopback Detection Configuration Commands ............2-1 2.1 Loopback Detection Configuration Commands .............. -
Page 2: Chapter 1 Loopback Detection Configuration
H3C Loopback Detection Feature Manual Release 2107 Chapter 1 Loopback Detection Configuration Chapter 1 Loopback Detection Configuration Note: Two functions are added to release 2107: configuring loopback detection for a list of ports in bulk, and enabling auto-shutdown of loopback ports. 1.1 Loopback Detection Configuration 1.1.1 Loopback Detection Overview Loopback detection is used to monitor if a port of a switch is looped back. -
Page 3: Configuring Loopback Detection For Ethernet Port(S)
H3C Loopback Detection Feature Manual Release 2107 Chapter 1 Loopback Detection Configuration If the loopback port auto-shutdown function is enabled on the port, the system will shut down the port and send log messages to the terminal. After the loop is removed, you need to use the undo shutdown command to bring up the port. - Page 4 H3C Loopback Detection Feature Manual Release 2107 Chapter 1 Loopback Detection Configuration Operation Command Remarks Optional By default, the loopback detection function is enabled on Enable loopback loopback-detection ports if the device boots with the detection on a enable default configuration file specified port (config.def);...
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Page 5: Chapter 2 Loopback Detection Configuration Commands
H3C Loopback Detection Feature Manual Chapter 2 Loopback Detection Configuration Release 2107 Commands Chapter 2 Loopback Detection Configuration Commands Note: Two functions are added to release 2107: configuring loopback detection for a list of ports in bulk, and enabling auto-shutdown of loopback ports. For detailed description of functions, refer loopback-detection... -
Page 6: Loopback-Detection Enable
H3C Loopback Detection Feature Manual Chapter 2 Loopback Detection Configuration Release 2107 Commands After the loop is removed, the port will automatically resume the normal forwarding state. With the function disabled on the trunk or hybrid port, the system will only send log messages to the terminal, and the port is still in the normal forwarding state. - Page 7 H3C Loopback Detection Feature Manual Chapter 2 Loopback Detection Configuration Release 2107 Commands will shut down the port, and send log messages to the terminal. After the loop is removed, you need to use the undo shutdown command to bring up the port. If you have not enabled the loopback port auto-shutdown function on the access port, the port will automatically resume the normal forwarding state after the loop is removed.
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Page 8: Loopback-Detection Interface-List Enable
H3C Loopback Detection Feature Manual Chapter 2 Loopback Detection Configuration Release 2107 Commands 2.1.3 loopback-detection interface-list enable Syntax loopback-detection interface-list enable undo loopback-detection interface-list enable View System view Parameter interface-list: Ethernet port list, in the form of interface-list = { interface-type interface-number [ to interface-type interface-number ] } &<1-10>, where interface-type is the port type, and interface-number is the port number. -
Page 9: Loopback-Detection Interval-Time
H3C Loopback Detection Feature Manual Chapter 2 Loopback Detection Configuration Release 2107 Commands 2.1.4 loopback-detection interval-time Syntax loopback-detection interval-time time undo loopback-detection interval-time View System view Parameter time: Time interval for loopback detection, in the range of 5 to 300 (in seconds). It is 30 seconds by default. -
Page 10: Loopback-Detection Shutdown Enable
H3C Loopback Detection Feature Manual Chapter 2 Loopback Detection Configuration Release 2107 Commands Use the undo loopback-detection per-vlan enable command to restore the default setting. By default, the system runs loopback detection only on the default VLAN of the trunk or hybrid port. - Page 11 H3C Loopback Detection Feature Manual Chapter 2 Loopback Detection Configuration Release 2107 Commands By default, the loopback port auto-shutdown function is enabled on ports if the device boots with the default configuration file (config.def); if the device boots with null configuration, this function is disabled.