3com 5500-ei pwr Guía De Referencia

 

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# Enable the loopback port auto-shutdown function on port Ethernet 1/0/1.  

<Sysname> system-view 

System View: return to User View with Ctrl+Z. 

[Sysname] loopback-detection enable 

[Sysname] interface ethernet 1/0/1 

[Sysname-Ethernet1/0/1] loopback-detection shutdown enable 

mdi { across | auto | normal } 

Ethernet port view 

across: Sets the MDI mode to medium dependent interface (MDI). 

normal: Sets the MDI mode to media dependent interface-X mode (MDI-X).  

auto: Sets the MDI mode to auto-sensing. Port operating in this mode adjust its MDI mode between 

MDI and MDI-X automatically.  

 

z 

An RJ-45 interface can operate in MDI or MDI-X mode. 

z 

To connect two RJ-45 interfaces operating in the same MDI mode, use a crossover cable; to 

connect two RJ-45 interfaces operating in different MDI modes, use a straight-through cable.  

z 

The MDI mode of an optical port is fixed to auto. 

 

Use the mdi command to set the MDI mode for a port.  

Use the undo mdi command to restore the default setting.  

By default, a port operates in auto-sensing MDI mode.  

# Set the MDI mode of Ethernet 1/0/1 to MDI.  

<Sysname> system-view 

System View: return to User View with Ctrl+Z. 

[Sysname] interface Ethernet 1/0/1 

[Sysname-Ethernet1/0/1] mdi across