3com 8807 Guia Do Utilizador
75
E
THERNET
P
ORT
L
OOPBACK
D
ETECTION
Ethernet Port
Loopback Detection
Function
Loopback Detection
Function
Use the following configuration tasks can enable the port loopback detection
function, configure the VLAN enabled with the loopback detection function (you
can configure up to 800 such VLANs) and set the interval for external loopback
detection on ports to check whether there exists a loop on each port or not. If a
loop is found on a port, the switch will give out a trap alarm and determine
whether performing Shutdown on this loop or not according to your
configuration.
function, configure the VLAN enabled with the loopback detection function (you
can configure up to 800 such VLANs) and set the interval for external loopback
detection on ports to check whether there exists a loop on each port or not. If a
loop is found on a port, the switch will give out a trap alarm and determine
whether performing Shutdown on this loop or not according to your
configuration.
Configuring the
Loopback Detection
Function
Loopback Detection
Function
Displaying and
Maintaining the
Loopback Detection
Function
Maintaining the
Loopback Detection
Function
Execute the display command in any view to display the configuration
information of the loopback detection function and the detection results.
information of the loopback detection function and the detection results.
Table 811 Configure the loopback detection function
Operation
Command
Remarks
Ether system view
system-view
-
Enable the global loopback
detection function
detection function
loopback-detection enable Required
Enable the loopback detection
function in a VLAN
function in a VLAN
loopback-detection enable
vlan { vlanlist | all }
vlan { vlanlist | all }
Required; (need to enable the
global loopback detection
function)
global loopback detection
function)
Set the time interval for
external loopback detection
on a port
external loopback detection
on a port
loopback-detection
interval-time time
interval-time time
Optional; (need to enable the
global loopback detection
function)
global loopback detection
function)
Enter Ethernet port view
interface interface-type
interface-num
interface-num
-
Enable the control function of
port loopback detection
port loopback detection
loopback-detection control
Optional; (need to enable the
global loopback detection
function)
global loopback detection
function)
Disable the port loopback
detection function
detection function
loopback-detection disable
Optional; (need to enable the
global loopback detection
function)
global loopback detection
function)
Display the port loopback
detection information
detection information
display loopback-detection Display it in any view
Table 812 Display and maintain the loopback detection function
Operation
Command
Display loopback detection information
display loopback-detection