3com S7906E Manuel De Montage

 

1-5 

Enter system view 

— 

Enter Ethernet port or ONU port 
view 

interface interface-type 
interface-number 

— 

Configure 
physical-link-down-state 
change suppression time 

link-delay delay-time 

Required 

Disabled by default  

 

Follow these steps to configure the suppression time of physical-link-up-state changes on a port : 

Enter system view 

— 

Enter Ethernet port or ONU port 
view 

interface interface-type 
interface-number 

— 

Configure 
physical-link-up-state change 
suppression time.  

link-delay delay-time mode up

Required 

Disabled by default  

 

z 

The link-delay mode up command and the link-delay command are mutually exclusive with each 

other on a port. When both commands are configured on a port, the one that is configured earlier is 

disabled. 

z 

The link-delay command cannot take effect on ports that are manually disabled using the shutdown 

command. 

 

You can enable loopback testing to check whether the Ethernet port functions properly. Note that no 

data packets can be forwarded during the testing. Loopback testing falls into the following two 

categories: 

z 

Internal loopback testing, which is performed within switching chips to test the functions related to 

the Ethernet ports. 

z 

External loopback testing, which is used to test the hardware functions of an Ethernet port. To 

perform external loopback testing on an Ethernet port, you need to install a loopback plug on the 

Ethernet port. In this case, packets sent from the port are received by the same port. 

Follow these steps to enable Ethernet port loopback testing: 

Enter system view 

— 

Enter Ethernet port or ONU port  
view 

interface interface-type 
interface-number 

— 

Enable loopback testing 

loopback { external | 
internal } 

Optional 

Disabled by default.