3com S7906E 참조 가이드

 

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By default, loopback detection is disabled for an Access, Trunk, or Hybrid port. 

With loopback detection enabled on a port (whose link type may be Access, Trunk, or Hybrid): 

z 

If an Access port has been detected with loopback, it will transit to the loopback detection control 

state, where the incoming packets of the port are dropped and the outgoing packets of the port are 

forwarded normally. A Trap message will be sent to the terminal and the corresponding MAC 

address. 

z 

If a Trunk port or Hybrid port has been detected with loopback, a Trunk message will be sent to the 

terminal. If the loopback detection control function is enabled on the port, the port will transit to the 

loopback detection control state, where the incoming packets of the port are dropped and the 

outgoing packets of the port are forwarded normally. In addition, a Trap message will be sent to the 

terminal and the corresponding MAC address forwarding entries will be deleted. 

Related commands: loopback-detection control enable. 

 

z 

Loopback detection on a given port is enabled only after the loopback-detection enable 

command has been configured in both system view and interface view of the port. 

z 

Loopback detection on all ports will be disabled after the configuration of the undo 

loopback-detection enable command in system view. 

 

# Enable loopback detection on the interface Ethernet 2/0/1. 

<Sysname> system-view 

[Sysname] loopback-detection enable 

[Sysname] interface ethernet 2/0/1 

[Sysname-Ethernet2/0/1] loopback-detection enable 

loopback-detection interval-time time 

undo loopback-detection interval-time 

System view 

2: System level 

time: Time interval for performing port loopback detection, in the range 5 to 300 (in seconds).